From: Marc Fournier <marc.fournier@camptocamp.com>
Date: Mon, 24 Nov 2014 08:44:45 +0000 (+0100)
Subject: Merge branch 'collectd-5.4'
X-Git-Tag: collectd-5.5.0~127
X-Git-Url: https://git.tokkee.org/?a=commitdiff_plain;h=e1812f8e5c5f91328398c66b602d07ee7c6ede51;p=collectd.git

Merge branch 'collectd-5.4'

Conflicts:
	src/Makefile.am
	src/cpu.c
	src/swap.c
	src/write_redis.c

NB: dropped change to src/swap.c made in 1a146775d4, as suggested in the
commit message.
---

e1812f8e5c5f91328398c66b602d07ee7c6ede51
diff --cc src/collectd.conf.in
index 5196979e,1e0f78c1..a25cce55
--- a/src/collectd.conf.in
+++ b/src/collectd.conf.in
@@@ -1039,16 -1002,20 +1074,22 @@@
  #  DeleteGauges   false
  #  DeleteSets     false
  #  TimerPercentile 90.0
+ #  TimerPercentile 95.0
+ #  TimerPercentile 99.0
+ #  TimerLower     false
+ #  TimerUpper     false
+ #  TimerSum       false
+ #  TimerCount     false
  #</Plugin>
  
 -#<Plugin "swap">
 +#<Plugin swap>
  #	ReportByDevice false
  #	ReportBytes true
 +#	ValuesAbsolute true
 +#	ValuesPercentage false
  #</Plugin>
  
 -#<Plugin "table">
 +#<Plugin table>
  #	<Table "/proc/slabinfo">
  #		Instance "slabinfo"
  #		Separator " "
diff --cc src/collectd.conf.pod
index 20c61260,03a14443..a65d432b
--- a/src/collectd.conf.pod
+++ b/src/collectd.conf.pod
@@@ -7105,9 -6304,64 +7118,64 @@@ want to set B<metadata.broker.list> to 
  
  =back
  
+ =head2 Plugin C<write_redis>
+ 
+ The I<write_redis plugin> submits values to I<Redis>, a data structure server.
+ 
+ Synopsis:
+ 
+   <Plugin "write_redis">
+     <Node "example">
+         Host "localhost"
+         Port "6379"
+         Timeout 1000
+     </Node>
+   </Plugin>
+ 
+ Values are submitted to I<Sorted Sets>, using the metric name as the key, and
+ the timestamp as the score. Retrieving a date range can then be done using the
+ C<ZRANGEBYSCORE> I<Redis> command. Additionnally, all the identifiers of these
+ I<Sorted Sets> are kept in a I<Set> called C<collectd/values> and can be
+ retrieved using the C<SMEMBERS> I<Redis> command. See
+ L<http://redis.io/commands#sorted_set> and L<http://redis.io/commands#set> for
+ details.
+ 
+ The information shown in the synopsis above is the I<default configuration>
+ which is used by the plugin if no configuration is present.
+ 
+ The plugin can send values to multiple instances of I<Redis> by specifying
+ one B<Node> block for each instance. Within the B<Node> blocks, the following
+ options are available:
+ 
+ =over 4
+ 
+ =item B<Node> I<Nodename>
+ 
+ The B<Node> block identifies a new I<Redis> node, that is a new I<Redis>
+ instance running in an specified host and port. The name for node is a
+ canonical identifier which is used as I<plugin instance>. It is limited to
+ 64E<nbsp>characters in length.
+ 
+ =item B<Host> I<Hostname>
+ 
+ The B<Host> option is the hostname or IP-address where the I<Redis> instance is
+ running on.
+ 
+ =item B<Port> I<Port>
+ 
+ The B<Port> option is the TCP port on which the Redis instance accepts
+ connections. Either a service name of a port number may be given. Please note
+ that numerical port numbers must be given as a string, too.
+ 
+ =item B<Timeout> I<Timeout in miliseconds>
+ 
+ The B<Timeout> option sets the socket connection timeout, in milliseconds.
+ 
+ =back
+ 
  =head2 Plugin C<write_riemann>
  
 -The I<write_riemann plugin> will send values to I<Riemann>, a powerfull stream
 +The I<write_riemann plugin> will send values to I<Riemann>, a powerful stream
  aggregation and monitoring system. The plugin sends I<Protobuf> encoded data to
  I<Riemann> using UDP packets.
  
diff --cc src/cpu.c
index d1978f96,1c4e5f6b..2fb4918b
--- a/src/cpu.c
+++ b/src/cpu.c
@@@ -172,57 -139,9 +166,57 @@@ static int numcpu
  static int pnumcpu;
  #endif /* HAVE_PERFSTAT */
  
 +#define RATE_ADD(sum, val) do { \
 +	if (isnan (sum))        \
 +	(sum) = (val);          \
 +	else if (!isnan (val))  \
 +	(sum) += (val);         \
 +} while (0)
 +
 +struct cpu_state_s
 +{
 +	value_to_rate_state_t conv;
 +	gauge_t rate;
 +	_Bool has_value;
 +};
 +typedef struct cpu_state_s cpu_state_t;
 +
 +static cpu_state_t *cpu_states = NULL;
 +static size_t cpu_states_num = 0; /* #cpu_states allocated */
 +
 +/* Highest CPU number in the current iteration. Used by the dispatch logic to
 + * determine how many CPUs there were. Reset to 0 by cpu_reset(). */
 +static size_t global_cpu_num = 0;
 +
 +static _Bool report_by_cpu = 1;
 +static _Bool report_by_state = 1;
 +static _Bool report_percent = 0;
 +
 +static const char *config_keys[] =
 +{
 +	"ReportByCpu",
 +	"ReportByState",
 +	"ValuesPercentage"
 +};
 +static int config_keys_num = STATIC_ARRAY_SIZE (config_keys);
 +
 +static int cpu_config (char const *key, char const *value) /* {{{ */
 +{
 +	if (strcasecmp (key, "ReportByCpu") == 0)
 +		report_by_cpu = IS_TRUE (value) ? 1 : 0;
 +	else if (strcasecmp (key, "ValuesPercentage") == 0)
 +		report_percent = IS_TRUE (value) ? 1 : 0;
 +	else if (strcasecmp (key, "ReportByState") == 0)
 +		report_by_state = IS_TRUE (value) ? 1 : 0;
 +	else
 +		return (-1);
 +
 +	return (0);
 +} /* }}} int cpu_config */
 +
  static int init (void)
  {
- #if PROCESSOR_CPU_LOAD_INFO || PROCESSOR_TEMPERATURE
+ #if PROCESSOR_CPU_LOAD_INFO
  	kern_return_t status;
  
  	port_host = mach_host_self ();
@@@ -339,257 -254,15 +333,251 @@@ static void submit_value (int cpu_num, 
  	plugin_dispatch_values (&vl);
  }
  
 +static void submit_percent(int cpu_num, int cpu_state, gauge_t percent)
 +{
 +	value_t value;
 +
 +	/* This function is called for all known CPU states, but each read
 +	 * method will only report a subset. The remaining states are left as
 +	 * NAN and we ignore them here. */
 +	if (isnan (percent))
 +		return;
 +
 +	value.gauge = percent;
 +	submit_value (cpu_num, cpu_state, "percent", value);
 +}
 +
 +static void submit_derive(int cpu_num, int cpu_state, derive_t derive)
 +{
 +	value_t value;
 +
 +	value.derive = derive;
 +	submit_value (cpu_num, cpu_state, "cpu", value);
 +}
 +
 +/* Takes the zero-index number of a CPU and makes sure that the module-global
 + * cpu_states buffer is large enough. Returne ENOMEM on erorr. */
 +static int cpu_states_alloc (size_t cpu_num) /* {{{ */
 +{
 +	cpu_state_t *tmp;
 +	size_t sz;
 +
 +	sz = (((size_t) cpu_num) + 1) * CPU_STATE_MAX;
 +	assert (sz > 0);
 +
 +	/* We already have enough space. */
 +	if (cpu_states_num >= sz)
 +		return 0;
 +
 +	tmp = realloc (cpu_states, sz * sizeof (*cpu_states));
 +	if (tmp == NULL)
 +	{
 +		ERROR ("cpu plugin: realloc failed.");
 +		return (ENOMEM);
 +	}
 +	cpu_states = tmp;
 +	tmp = cpu_states + cpu_states_num;
 +
 +	memset (tmp, 0, (sz - cpu_states_num) * sizeof (*cpu_states));
 +	cpu_states_num = sz;
 +	return 0;
 +} /* }}} cpu_states_alloc */
 +
 +static cpu_state_t *get_cpu_state (size_t cpu_num, size_t state) /* {{{ */
 +{
 +	size_t index = ((cpu_num * CPU_STATE_MAX) + state);
 +
 +	if (index >= cpu_states_num)
 +		return (NULL);
 +
 +	return (&cpu_states[index]);
 +} /* }}} cpu_state_t *get_cpu_state */
 +
 +/* Populates the per-CPU CPU_STATE_ACTIVE rate and the global rate_by_state
 + * array. */
 +static void aggregate (gauge_t *sum_by_state) /* {{{ */
 +{
 +	size_t cpu_num;
 +	size_t state;
 +
 +	for (state = 0; state < CPU_STATE_MAX; state++)
 +		sum_by_state[state] = NAN;
 +
 +	for (cpu_num = 0; cpu_num < global_cpu_num; cpu_num++)
 +	{
 +		cpu_state_t *this_cpu_states = get_cpu_state (cpu_num, 0);
 +
 +		this_cpu_states[CPU_STATE_ACTIVE].rate = NAN;
 +
 +		for (state = 0; state < CPU_STATE_ACTIVE; state++)
 +		{
 +			if (!this_cpu_states[state].has_value)
 +				continue;
 +
 +			RATE_ADD (sum_by_state[state], this_cpu_states[state].rate);
 +			if (state != CPU_STATE_IDLE)
 +				RATE_ADD (this_cpu_states[CPU_STATE_ACTIVE].rate, this_cpu_states[state].rate);
 +		}
 +
 +		RATE_ADD (sum_by_state[CPU_STATE_ACTIVE], this_cpu_states[CPU_STATE_ACTIVE].rate);
 +	}
 +} /* }}} void aggregate */
 +
 +/* Commits (dispatches) the values for one CPU or the global aggregation.
 + * cpu_num is the index of the CPU to be committed or -1 in case of the global
 + * aggregation. rates is a pointer to CPU_STATE_MAX gauge_t values holding the
 + * current rate; each rate may be NAN. Calculates the percentage of each state
 + * and dispatches the metric. */
 +static void cpu_commit_one (int cpu_num, /* {{{ */
 +		gauge_t rates[static CPU_STATE_MAX])
 +{
 +	size_t state;
 +	gauge_t sum;
 +
 +	sum = rates[CPU_STATE_ACTIVE];
 +	RATE_ADD (sum, rates[CPU_STATE_IDLE]);
 +
 +	if (!report_by_state)
 +	{
 +		gauge_t percent = 100.0 * rates[CPU_STATE_ACTIVE] / sum;
 +		submit_percent (cpu_num, CPU_STATE_ACTIVE, percent);
 +		return;
 +	}
 +
 +	for (state = 0; state < CPU_STATE_ACTIVE; state++)
 +	{
 +		gauge_t percent = 100.0 * rates[state] / sum;
 +		submit_percent (cpu_num, state, percent);
 +	}
 +} /* }}} void cpu_commit_one */
 +
 +/* Resets the internal aggregation. This is called by the read callback after
 + * each iteration / after each call to cpu_commit(). */
 +static void cpu_reset (void) /* {{{ */
 +{
 +	size_t i;
 +
 +	for (i = 0; i < cpu_states_num; i++)
 +		cpu_states[i].has_value = 0;
 +
 +	global_cpu_num = 0;
 +} /* }}} void cpu_reset */
 +
 +/* Legacy behavior: Dispatches the raw derive values without any aggregation. */
 +static void cpu_commit_without_aggregation (void) /* {{{ */
 +{
 +	int state;
 +
 +	for (state = 0; state < CPU_STATE_ACTIVE; state++)
 +	{
 +		size_t cpu_num;
 +		if (report_by_cpu) {
 +			for (cpu_num = 0; cpu_num < global_cpu_num; cpu_num++)
 +			{
 +				cpu_state_t *s = get_cpu_state (cpu_num, state);
 +
 +				if (!s->has_value)
 +					continue;
 +
 +				submit_derive ((int) cpu_num, (int) state, s->conv.last_value.derive);
 +			}
 +		} else {
 +			derive_t derive_total = 0;
 +			for (cpu_num = 0; cpu_num < global_cpu_num; cpu_num++)
 +				{
 +					cpu_state_t *s = get_cpu_state (cpu_num, state);
 +
 +					if (!s->has_value)
 +						continue;
 +
 +					derive_total += s->conv.last_value.derive;
 +			
 +				}
 +			submit_derive (-1, (int) state, derive_total);
 +		}
 +	}
 +} /* }}} void cpu_commit_without_aggregation */
 +
 +/* Aggregates the internal state and dispatches the metrics. */
 +static void cpu_commit (void) /* {{{ */
 +{
 +	gauge_t global_rates[CPU_STATE_MAX] = {
 +		NAN, NAN, NAN, NAN, NAN, NAN, NAN, NAN, NAN, NAN
 +	};
 +	size_t cpu_num;
 +
 +	if (report_by_state && !report_percent)
 +	{
 +		cpu_commit_without_aggregation ();
 +		return;
 +	}
 +
 +	aggregate (global_rates);
 +
 +	if (!report_by_cpu)
 +	{
 +		cpu_commit_one (-1, global_rates);
 +		return;
 +	}
 +
 +	for (cpu_num = 0; cpu_num < global_cpu_num; cpu_num++)
 +	{
 +		cpu_state_t *this_cpu_states = get_cpu_state (cpu_num, 0);
 +		gauge_t local_rates[CPU_STATE_MAX] = {
 +			NAN, NAN, NAN, NAN, NAN, NAN, NAN, NAN, NAN, NAN
 +		};
 +		size_t state;
 +
 +		for (state = 0; state < CPU_STATE_ACTIVE; state++)
 +			if (this_cpu_states[state].has_value)
 +				local_rates[state] = this_cpu_states[state].rate;
 +
 +		cpu_commit_one ((int) cpu_num, local_rates);
 +	}
 +} /* }}} void cpu_commit */
 +
 +/* Adds a derive value to the internal state. This should be used by each read
 + * function for each state. At the end of the iteration, the read function
 + * should call cpu_commit(). */
 +static int cpu_stage (size_t cpu_num, size_t state, derive_t value, cdtime_t now) /* {{{ */
 +{
 +	int status;
 +	cpu_state_t *s;
 +	value_t v;
 +
 +	if (state >= CPU_STATE_ACTIVE)
 +		return (EINVAL);
 +
 +	status = cpu_states_alloc (cpu_num);
 +	if (status != 0)
 +		return (status);
 +
 +	if (global_cpu_num <= cpu_num)
 +		global_cpu_num = cpu_num + 1;
 +
 +	s = get_cpu_state (cpu_num, state);
 +
 +	v.gauge = NAN;
 +	status = value_to_rate (&v, value, &s->conv, DS_TYPE_DERIVE, now);
 +	if (status != 0)
 +		return (status);
 +
 +	s->rate = v.gauge;
 +	s->has_value = 1;
 +	return (0);
 +} /* }}} int cpu_stage */
 +
  static int cpu_read (void)
  {
 -#if PROCESSOR_CPU_LOAD_INFO
 +	cdtime_t now = cdtime ();
 +
- #if PROCESSOR_CPU_LOAD_INFO || PROCESSOR_TEMPERATURE /* {{{ */
++#if PROCESSOR_CPU_LOAD_INFO /* {{{ */
  	int cpu;
  
  	kern_return_t status;
 -	
 +
- #if PROCESSOR_CPU_LOAD_INFO
  	processor_cpu_load_info_data_t cpu_info;
  	mach_msg_type_number_t         cpu_info_len;
- #endif
- #if PROCESSOR_TEMPERATURE
- 	processor_info_data_t          cpu_temp;
- 	mach_msg_type_number_t         cpu_temp_len;
- #endif
  
  	host_t cpu_host;
  
@@@ -613,59 -286,17 +601,15 @@@
  			continue;
  		}
  
 -		submit (cpu, "user", (derive_t) cpu_info.cpu_ticks[CPU_STATE_USER]);
 -		submit (cpu, "nice", (derive_t) cpu_info.cpu_ticks[CPU_STATE_NICE]);
 -		submit (cpu, "system", (derive_t) cpu_info.cpu_ticks[CPU_STATE_SYSTEM]);
 -		submit (cpu, "idle", (derive_t) cpu_info.cpu_ticks[CPU_STATE_IDLE]);
 +		cpu_stage (cpu, CPU_STATE_USER,   (derive_t) cpu_info.cpu_ticks[CPU_STATE_USER],   now);
 +		cpu_stage (cpu, CPU_STATE_NICE,   (derive_t) cpu_info.cpu_ticks[CPU_STATE_NICE],   now);
 +		cpu_stage (cpu, CPU_STATE_SYSTEM, (derive_t) cpu_info.cpu_ticks[CPU_STATE_SYSTEM], now);
 +		cpu_stage (cpu, CPU_STATE_IDLE,   (derive_t) cpu_info.cpu_ticks[CPU_STATE_IDLE],   now);
- #endif /* PROCESSOR_CPU_LOAD_INFO */
- 
- #if PROCESSOR_TEMPERATURE
- 		/*
- 		 * Not all Apple computers do have this ability. To minimize
- 		 * the messages sent to the syslog we do an exponential
- 		 * stepback if `processor_info' fails. We still try ~once a day
- 		 * though..
- 		 */
- 		if (cpu_temp_retry_counter > 0)
- 		{
- 			cpu_temp_retry_counter--;
- 			continue;
- 		}
- 
- 		cpu_temp_len = PROCESSOR_INFO_MAX;
- 
- 		status = processor_info (cpu_list[cpu],
- 				PROCESSOR_TEMPERATURE,
- 				&cpu_host,
- 				cpu_temp, &cpu_temp_len);
- 		if (status != KERN_SUCCESS)
- 		{
- 			ERROR ("cpu plugin: processor_info failed: %s",
- 					mach_error_string (status));
- 
- 			cpu_temp_retry_counter = cpu_temp_retry_step;
- 			cpu_temp_retry_step *= 2;
- 			if (cpu_temp_retry_step > cpu_temp_retry_max)
- 				cpu_temp_retry_step = cpu_temp_retry_max;
- 
- 			continue;
- 		}
- 
- 		if (cpu_temp_len != 1)
- 		{
- 			DEBUG ("processor_info (PROCESSOR_TEMPERATURE) returned %i elements..?",
- 					(int) cpu_temp_len);
- 			continue;
- 		}
- 
- 		cpu_temp_retry_counter = 0;
- 		cpu_temp_retry_step    = 1;
- #endif /* PROCESSOR_TEMPERATURE */
  	}
 -/* #endif PROCESSOR_CPU_LOAD_INFO */
 +/* }}} #endif PROCESSOR_CPU_LOAD_INFO */
  
 -#elif defined(KERNEL_LINUX)
 +#elif defined(KERNEL_LINUX) /* {{{ */
  	int cpu;
 -	derive_t user, nice, syst, idle;
 -	derive_t wait, intr, sitr; /* sitr == soft interrupt */
  	FILE *fh;
  	char buf[1024];
  
diff --cc src/daemon/common.c
index 535dfad3,00000000..e2b618fb
mode 100644,000000..100644
--- a/src/daemon/common.c
+++ b/src/daemon/common.c
@@@ -1,1650 -1,0 +1,1650 @@@
 +/**
 + * collectd - src/common.c
 + * Copyright (C) 2005-2014  Florian octo Forster
 + *
 + * Permission is hereby granted, free of charge, to any person obtaining a
 + * copy of this software and associated documentation files (the "Software"),
 + * to deal in the Software without restriction, including without limitation
 + * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 + * and/or sell copies of the Software, and to permit persons to whom the
 + * Software is furnished to do so, subject to the following conditions:
 + *
 + * The above copyright notice and this permission notice shall be included in
 + * all copies or substantial portions of the Software.
 + *
 + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 + * DEALINGS IN THE SOFTWARE.
 + *
 + * Authors:
 + *   Florian octo Forster <octo at collectd.org>
 + *   Niki W. Waibel <niki.waibel@gmx.net>
 + *   Sebastian Harl <sh at tokkee.org>
 + *   Michał Mirosław <mirq-linux at rere.qmqm.pl>
 +**/
 +
 +#if HAVE_CONFIG_H
 +# include "config.h"
 +#endif
 +
 +#include "collectd.h"
 +#include "common.h"
 +#include "plugin.h"
 +#include "utils_cache.h"
 +
 +#if HAVE_PTHREAD_H
 +# include <pthread.h>
 +#endif
 +
 +#ifdef HAVE_MATH_H
 +# include <math.h>
 +#endif
 +
 +/* for getaddrinfo */
 +#include <sys/types.h>
 +#include <sys/socket.h>
 +#include <netdb.h>
 +
 +#if HAVE_NETINET_IN_H
 +# include <netinet/in.h>
 +#endif
 +
 +/* for ntohl and htonl */
 +#if HAVE_ARPA_INET_H
 +# include <arpa/inet.h>
 +#endif
 +
 +#ifdef HAVE_LIBKSTAT
 +extern kstat_ctl_t *kc;
 +#endif
 +
 +#if !HAVE_GETPWNAM_R
 +static pthread_mutex_t getpwnam_r_lock = PTHREAD_MUTEX_INITIALIZER;
 +#endif
 +
 +#if !HAVE_STRERROR_R
 +static pthread_mutex_t strerror_r_lock = PTHREAD_MUTEX_INITIALIZER;
 +#endif
 +
 +char *sstrncpy (char *dest, const char *src, size_t n)
 +{
 +	strncpy (dest, src, n);
 +	dest[n - 1] = '\0';
 +
 +	return (dest);
 +} /* char *sstrncpy */
 +
 +int ssnprintf (char *dest, size_t n, const char *format, ...)
 +{
 +	int ret = 0;
 +	va_list ap;
 +
 +	va_start (ap, format);
 +	ret = vsnprintf (dest, n, format, ap);
 +	dest[n - 1] = '\0';
 +	va_end (ap);
 +
 +	return (ret);
 +} /* int ssnprintf */
 +
 +char *ssnprintf_alloc (char const *format, ...) /* {{{ */
 +{
 +	char static_buffer[1024] = "";
 +	char *alloc_buffer;
 +	size_t alloc_buffer_size;
 +	int status;
 +	va_list ap;
 +
 +	/* Try printing into the static buffer. In many cases it will be
 +	 * sufficiently large and we can simply return a strdup() of this
 +	 * buffer. */
 +	va_start (ap, format);
 +	status = vsnprintf (static_buffer, sizeof (static_buffer), format, ap);
 +	va_end (ap);
 +	if (status < 0)
 +		return (NULL);
 +
 +	/* "status" does not include the null byte. */
 +	alloc_buffer_size = (size_t) (status + 1);
 +	if (alloc_buffer_size <= sizeof (static_buffer))
 +		return (strdup (static_buffer));
 +
 +	/* Allocate a buffer large enough to hold the string. */
 +	alloc_buffer = malloc (alloc_buffer_size);
 +	if (alloc_buffer == NULL)
 +		return (NULL);
 +	memset (alloc_buffer, 0, alloc_buffer_size);
 +
 +	/* Print again into this new buffer. */
 +	va_start (ap, format);
 +	status = vsnprintf (alloc_buffer, alloc_buffer_size, format, ap);
 +	va_end (ap);
 +	if (status < 0)
 +	{
 +		sfree (alloc_buffer);
 +		return (NULL);
 +	}
 +
 +	return (alloc_buffer);
 +} /* }}} char *ssnprintf_alloc */
 +
 +char *sstrdup (const char *s)
 +{
 +	char *r;
 +	size_t sz;
 +
 +	if (s == NULL)
 +		return (NULL);
 +
 +	/* Do not use `strdup' here, because it's not specified in POSIX. It's
 +	 * ``only'' an XSI extension. */
 +	sz = strlen (s) + 1;
 +	r = (char *) malloc (sizeof (char) * sz);
 +	if (r == NULL)
 +	{
 +		ERROR ("sstrdup: Out of memory.");
 +		exit (3);
 +	}
 +	memcpy (r, s, sizeof (char) * sz);
 +
 +	return (r);
 +} /* char *sstrdup */
 +
 +/* Even though Posix requires "strerror_r" to return an "int",
 + * some systems (e.g. the GNU libc) return a "char *" _and_
 + * ignore the second argument ... -tokkee */
 +char *sstrerror (int errnum, char *buf, size_t buflen)
 +{
 +	buf[0] = '\0';
 +
 +#if !HAVE_STRERROR_R
 +	{
 +		char *temp;
 +
 +		pthread_mutex_lock (&strerror_r_lock);
 +
 +		temp = strerror (errnum);
 +		sstrncpy (buf, temp, buflen);
 +
 +		pthread_mutex_unlock (&strerror_r_lock);
 +	}
 +/* #endif !HAVE_STRERROR_R */
 +
 +#elif STRERROR_R_CHAR_P
 +	{
 +		char *temp;
 +		temp = strerror_r (errnum, buf, buflen);
 +		if (buf[0] == '\0')
 +		{
 +			if ((temp != NULL) && (temp != buf) && (temp[0] != '\0'))
 +				sstrncpy (buf, temp, buflen);
 +			else
 +				sstrncpy (buf, "strerror_r did not return "
 +						"an error message", buflen);
 +		}
 +	}
 +/* #endif STRERROR_R_CHAR_P */
 +
 +#else
 +	if (strerror_r (errnum, buf, buflen) != 0)
 +	{
 +		ssnprintf (buf, buflen, "Error #%i; "
 +				"Additionally, strerror_r failed.",
 +				errnum);
 +	}
 +#endif /* STRERROR_R_CHAR_P */
 +
 +	return (buf);
 +} /* char *sstrerror */
 +
 +void *smalloc (size_t size)
 +{
 +	void *r;
 +
 +	if ((r = malloc (size)) == NULL)
 +	{
 +		ERROR ("Not enough memory.");
 +		exit (3);
 +	}
 +
 +	return (r);
 +} /* void *smalloc */
 +
 +#if 0
 +void sfree (void **ptr)
 +{
 +	if (ptr == NULL)
 +		return;
 +
 +	if (*ptr != NULL)
 +		free (*ptr);
 +
 +	*ptr = NULL;
 +}
 +#endif
 +
 +ssize_t sread (int fd, void *buf, size_t count)
 +{
 +	char    *ptr;
 +	size_t   nleft;
 +	ssize_t  status;
 +
 +	ptr   = (char *) buf;
 +	nleft = count;
 +
 +	while (nleft > 0)
 +	{
 +		status = read (fd, (void *) ptr, nleft);
 +
 +		if ((status < 0) && ((errno == EAGAIN) || (errno == EINTR)))
 +			continue;
 +
 +		if (status < 0)
 +			return (status);
 +
 +		if (status == 0)
 +		{
 +			DEBUG ("Received EOF from fd %i. "
 +					"Closing fd and returning error.",
 +					fd);
 +			close (fd);
 +			return (-1);
 +		}
 +
 +		assert ((0 > status) || (nleft >= (size_t)status));
 +
 +		nleft = nleft - status;
 +		ptr   = ptr   + status;
 +	}
 +
 +	return (0);
 +}
 +
 +
 +ssize_t swrite (int fd, const void *buf, size_t count)
 +{
 +	const char *ptr;
 +	size_t      nleft;
 +	ssize_t     status;
 +
 +	ptr   = (const char *) buf;
 +	nleft = count;
 +
 +	while (nleft > 0)
 +	{
 +		status = write (fd, (const void *) ptr, nleft);
 +
 +		if ((status < 0) && ((errno == EAGAIN) || (errno == EINTR)))
 +			continue;
 +
 +		if (status < 0)
 +			return (status);
 +
 +		nleft = nleft - status;
 +		ptr   = ptr   + status;
 +	}
 +
 +	return (0);
 +}
 +
 +int strsplit (char *string, char **fields, size_t size)
 +{
 +	size_t i;
 +	char *ptr;
 +	char *saveptr;
 +
 +	i = 0;
 +	ptr = string;
 +	saveptr = NULL;
 +	while ((fields[i] = strtok_r (ptr, " \t\r\n", &saveptr)) != NULL)
 +	{
 +		ptr = NULL;
 +		i++;
 +
 +		if (i >= size)
 +			break;
 +	}
 +
 +	return ((int) i);
 +}
 +
 +int strjoin (char *dst, size_t dst_len,
 +		char **fields, size_t fields_num,
 +		const char *sep)
 +{
 +	size_t field_len;
 +	size_t sep_len;
 +	int i;
 +
 +	memset (dst, '\0', dst_len);
 +
 +	if (fields_num <= 0)
 +		return (-1);
 +
 +	sep_len = 0;
 +	if (sep != NULL)
 +		sep_len = strlen (sep);
 +
 +	for (i = 0; i < (int)fields_num; i++)
 +	{
 +		if ((i > 0) && (sep_len > 0))
 +		{
 +			if (dst_len <= sep_len)
 +				return (-1);
 +
 +			strncat (dst, sep, dst_len);
 +			dst_len -= sep_len;
 +		}
 +
 +		field_len = strlen (fields[i]);
 +
 +		if (dst_len <= field_len)
 +			return (-1);
 +
 +		strncat (dst, fields[i], dst_len);
 +		dst_len -= field_len;
 +	}
 +
 +	return (strlen (dst));
 +}
 +
 +int strsubstitute (char *str, char c_from, char c_to)
 +{
 +	int ret;
 +
 +	if (str == NULL)
 +		return (-1);
 +
 +	ret = 0;
 +	while (*str != '\0')
 +	{
 +		if (*str == c_from)
 +		{
 +			*str = c_to;
 +			ret++;
 +		}
 +		str++;
 +	}
 +
 +	return (ret);
 +} /* int strsubstitute */
 +
 +int escape_string (char *buffer, size_t buffer_size)
 +{
 +  char *temp;
 +  size_t i;
 +  size_t j;
 +
 +  /* Check if we need to escape at all first */
 +  temp = strpbrk (buffer, " \t\"\\");
 +  if (temp == NULL)
 +    return (0);
 +
 +  if (buffer_size < 3)
 +    return (EINVAL);
 +
 +  temp = (char *) malloc (buffer_size);
 +  if (temp == NULL)
 +    return (ENOMEM);
 +  memset (temp, 0, buffer_size);
 +
 +  temp[0] = '"';
 +  j = 1;
 +
 +  for (i = 0; i < buffer_size; i++)
 +  {
 +    if (buffer[i] == 0)
 +    {
 +      break;
 +    }
 +    else if ((buffer[i] == '"') || (buffer[i] == '\\'))
 +    {
 +      if (j > (buffer_size - 4))
 +        break;
 +      temp[j] = '\\';
 +      temp[j + 1] = buffer[i];
 +      j += 2;
 +    }
 +    else
 +    {
 +      if (j > (buffer_size - 3))
 +        break;
 +      temp[j] = buffer[i];
 +      j++;
 +    }
 +  }
 +
 +  assert ((j + 1) < buffer_size);
 +  temp[j] = '"';
 +  temp[j + 1] = 0;
 +
 +  sstrncpy (buffer, temp, buffer_size);
 +  sfree (temp);
 +  return (0);
 +} /* int escape_string */
 +
 +int strunescape (char *buf, size_t buf_len)
 +{
 +	size_t i;
 +
 +	for (i = 0; (i < buf_len) && (buf[i] != '\0'); ++i)
 +	{
 +		if (buf[i] != '\\')
 +			continue;
 +
 +		if (((i + 1) >= buf_len) || (buf[i + 1] == 0)) {
 +			ERROR ("string unescape: backslash found at end of string.");
 +			/* Ensure null-byte at the end of the buffer. */
 +			buf[i] = 0;
 +			return (-1);
 +		}
 +
 +		switch (buf[i + 1]) {
 +			case 't':
 +				buf[i] = '\t';
 +				break;
 +			case 'n':
 +				buf[i] = '\n';
 +				break;
 +			case 'r':
 +				buf[i] = '\r';
 +				break;
 +			default:
 +				buf[i] = buf[i + 1];
 +				break;
 +		}
 +
 +		/* Move everything after the position one position to the left.
 +		 * Add a null-byte as last character in the buffer. */
 +		memmove (buf + i + 1, buf + i + 2, buf_len - i - 2);
 +		buf[buf_len - 1] = 0;
 +	}
 +	return (0);
 +} /* int strunescape */
 +
 +size_t strstripnewline (char *buffer)
 +{
 +	size_t buffer_len = strlen (buffer);
 +
 +	while (buffer_len > 0)
 +	{
 +		if ((buffer[buffer_len - 1] != '\n')
 +				&& (buffer[buffer_len - 1] != '\r'))
 +			break;
- 		buffer[buffer_len] = 0;
 +		buffer_len--;
++		buffer[buffer_len] = 0;
 +	}
 +
 +	return (buffer_len);
 +} /* size_t strstripnewline */
 +
 +int escape_slashes (char *buffer, size_t buffer_size)
 +{
 +	int i;
 +	size_t buffer_len;
 +
 +	buffer_len = strlen (buffer);
 +
 +	if (buffer_len <= 1)
 +	{
 +		if (strcmp ("/", buffer) == 0)
 +		{
 +			if (buffer_size < 5)
 +				return (-1);
 +			sstrncpy (buffer, "root", buffer_size);
 +		}
 +		return (0);
 +	}
 +
 +	/* Move one to the left */
 +	if (buffer[0] == '/')
 +	{
 +		memmove (buffer, buffer + 1, buffer_len);
 +		buffer_len--;
 +	}
 +
 +	for (i = 0; i < buffer_len - 1; i++)
 +	{
 +		if (buffer[i] == '/')
 +			buffer[i] = '_';
 +	}
 +
 +	return (0);
 +} /* int escape_slashes */
 +
 +void replace_special (char *buffer, size_t buffer_size)
 +{
 +	size_t i;
 +
 +	for (i = 0; i < buffer_size; i++)
 +	{
 +		if (buffer[i] == 0)
 +			return;
 +		if ((!isalnum ((int) buffer[i])) && (buffer[i] != '-'))
 +			buffer[i] = '_';
 +	}
 +} /* void replace_special */
 +
 +int timeval_cmp (struct timeval tv0, struct timeval tv1, struct timeval *delta)
 +{
 +	struct timeval *larger;
 +	struct timeval *smaller;
 +
 +	int status;
 +
 +	NORMALIZE_TIMEVAL (tv0);
 +	NORMALIZE_TIMEVAL (tv1);
 +
 +	if ((tv0.tv_sec == tv1.tv_sec) && (tv0.tv_usec == tv1.tv_usec))
 +	{
 +		if (delta != NULL) {
 +			delta->tv_sec  = 0;
 +			delta->tv_usec = 0;
 +		}
 +		return (0);
 +	}
 +
 +	if ((tv0.tv_sec < tv1.tv_sec)
 +			|| ((tv0.tv_sec == tv1.tv_sec) && (tv0.tv_usec < tv1.tv_usec)))
 +	{
 +		larger  = &tv1;
 +		smaller = &tv0;
 +		status  = -1;
 +	}
 +	else
 +	{
 +		larger  = &tv0;
 +		smaller = &tv1;
 +		status  = 1;
 +	}
 +
 +	if (delta != NULL) {
 +		delta->tv_sec = larger->tv_sec - smaller->tv_sec;
 +
 +		if (smaller->tv_usec <= larger->tv_usec)
 +			delta->tv_usec = larger->tv_usec - smaller->tv_usec;
 +		else
 +		{
 +			--delta->tv_sec;
 +			delta->tv_usec = 1000000 + larger->tv_usec - smaller->tv_usec;
 +		}
 +	}
 +
 +	assert ((delta == NULL)
 +			|| ((0 <= delta->tv_usec) && (delta->tv_usec < 1000000)));
 +
 +	return (status);
 +} /* int timeval_cmp */
 +
 +int check_create_dir (const char *file_orig)
 +{
 +	struct stat statbuf;
 +
 +	char  file_copy[512];
 +	char  dir[512];
 +	int   dir_len = 512;
 +	char *fields[16];
 +	int   fields_num;
 +	char *ptr;
 +	char *saveptr;
 +	int   last_is_file = 1;
 +	int   path_is_absolute = 0;
 +	size_t len;
 +	int   i;
 +
 +	/*
 +	 * Sanity checks first
 +	 */
 +	if (file_orig == NULL)
 +		return (-1);
 +
 +	if ((len = strlen (file_orig)) < 1)
 +		return (-1);
 +	else if (len >= sizeof (file_copy))
 +		return (-1);
 +
 +	/*
 +	 * If `file_orig' ends in a slash the last component is a directory,
 +	 * otherwise it's a file. Act accordingly..
 +	 */
 +	if (file_orig[len - 1] == '/')
 +		last_is_file = 0;
 +	if (file_orig[0] == '/')
 +		path_is_absolute = 1;
 +
 +	/*
 +	 * Create a copy for `strtok_r' to destroy
 +	 */
 +	sstrncpy (file_copy, file_orig, sizeof (file_copy));
 +
 +	/*
 +	 * Break into components. This will eat up several slashes in a row and
 +	 * remove leading and trailing slashes..
 +	 */
 +	ptr = file_copy;
 +	saveptr = NULL;
 +	fields_num = 0;
 +	while ((fields[fields_num] = strtok_r (ptr, "/", &saveptr)) != NULL)
 +	{
 +		ptr = NULL;
 +		fields_num++;
 +
 +		if (fields_num >= 16)
 +			break;
 +	}
 +
 +	/*
 +	 * For each component, do..
 +	 */
 +	for (i = 0; i < (fields_num - last_is_file); i++)
 +	{
 +		/*
 +		 * Do not create directories that start with a dot. This
 +		 * prevents `../../' attacks and other likely malicious
 +		 * behavior.
 +		 */
 +		if (fields[i][0] == '.')
 +		{
 +			ERROR ("Cowardly refusing to create a directory that "
 +					"begins with a `.' (dot): `%s'", file_orig);
 +			return (-2);
 +		}
 +
 +		/*
 +		 * Join the components together again
 +		 */
 +		dir[0] = '/';
 +		if (strjoin (dir + path_is_absolute, dir_len - path_is_absolute,
 +					fields, i + 1, "/") < 0)
 +		{
 +			ERROR ("strjoin failed: `%s', component #%i", file_orig, i);
 +			return (-1);
 +		}
 +
 +		while (42) {
 +			if ((stat (dir, &statbuf) == -1)
 +					&& (lstat (dir, &statbuf) == -1))
 +			{
 +				if (errno == ENOENT)
 +				{
 +					if (mkdir (dir, S_IRWXU | S_IRWXG | S_IRWXO) == 0)
 +						break;
 +
 +					/* this might happen, if a different thread created
 +					 * the directory in the meantime
 +					 * => call stat() again to check for S_ISDIR() */
 +					if (EEXIST == errno)
 +						continue;
 +
 +					char errbuf[1024];
 +					ERROR ("check_create_dir: mkdir (%s): %s", dir,
 +							sstrerror (errno,
 +								errbuf, sizeof (errbuf)));
 +					return (-1);
 +				}
 +				else
 +				{
 +					char errbuf[1024];
 +					ERROR ("check_create_dir: stat (%s): %s", dir,
 +							sstrerror (errno, errbuf,
 +								sizeof (errbuf)));
 +					return (-1);
 +				}
 +			}
 +			else if (!S_ISDIR (statbuf.st_mode))
 +			{
 +				ERROR ("check_create_dir: `%s' exists but is not "
 +						"a directory!", dir);
 +				return (-1);
 +			}
 +			break;
 +		}
 +	}
 +
 +	return (0);
 +} /* check_create_dir */
 +
 +#ifdef HAVE_LIBKSTAT
 +int get_kstat (kstat_t **ksp_ptr, char *module, int instance, char *name)
 +{
 +	char ident[128];
 +
 +	*ksp_ptr = NULL;
 +
 +	if (kc == NULL)
 +		return (-1);
 +
 +	ssnprintf (ident, sizeof (ident), "%s,%i,%s", module, instance, name);
 +
 +	*ksp_ptr = kstat_lookup (kc, module, instance, name);
 +	if (*ksp_ptr == NULL)
 +	{
 +		ERROR ("get_kstat: Cound not find kstat %s", ident);
 +		return (-1);
 +	}
 +
 +	if ((*ksp_ptr)->ks_type != KSTAT_TYPE_NAMED)
 +	{
 +		ERROR ("get_kstat: kstat %s has wrong type", ident);
 +		*ksp_ptr = NULL;
 +		return (-1);
 +	}
 +
 +#ifdef assert
 +	assert (*ksp_ptr != NULL);
 +	assert ((*ksp_ptr)->ks_type == KSTAT_TYPE_NAMED);
 +#endif
 +
 +	if (kstat_read (kc, *ksp_ptr, NULL) == -1)
 +	{
 +		ERROR ("get_kstat: kstat %s could not be read", ident);
 +		return (-1);
 +	}
 +
 +	if ((*ksp_ptr)->ks_type != KSTAT_TYPE_NAMED)
 +	{
 +		ERROR ("get_kstat: kstat %s has wrong type", ident);
 +		return (-1);
 +	}
 +
 +	return (0);
 +}
 +
 +long long get_kstat_value (kstat_t *ksp, char *name)
 +{
 +	kstat_named_t *kn;
 +	long long retval = -1LL;
 +
 +	if (ksp == NULL)
 +	{
 +		ERROR ("get_kstat_value (\"%s\"): ksp is NULL.", name);
 +		return (-1LL);
 +	}
 +	else if (ksp->ks_type != KSTAT_TYPE_NAMED)
 +	{
 +		ERROR ("get_kstat_value (\"%s\"): ksp->ks_type (%#x) "
 +				"is not KSTAT_TYPE_NAMED (%#x).",
 +				name,
 +				(unsigned int) ksp->ks_type,
 +				(unsigned int) KSTAT_TYPE_NAMED);
 +		return (-1LL);
 +	}
 +
 +	if ((kn = (kstat_named_t *) kstat_data_lookup (ksp, name)) == NULL)
 +		return (-1LL);
 +
 +	if (kn->data_type == KSTAT_DATA_INT32)
 +		retval = (long long) kn->value.i32;
 +	else if (kn->data_type == KSTAT_DATA_UINT32)
 +		retval = (long long) kn->value.ui32;
 +	else if (kn->data_type == KSTAT_DATA_INT64)
 +		retval = (long long) kn->value.i64; /* According to ANSI C99 `long long' must hold at least 64 bits */
 +	else if (kn->data_type == KSTAT_DATA_UINT64)
 +		retval = (long long) kn->value.ui64; /* XXX: Might overflow! */
 +	else
 +		WARNING ("get_kstat_value: Not a numeric value: %s", name);
 +
 +	return (retval);
 +}
 +#endif /* HAVE_LIBKSTAT */
 +
 +#ifndef HAVE_HTONLL
 +unsigned long long ntohll (unsigned long long n)
 +{
 +#if BYTE_ORDER == BIG_ENDIAN
 +	return (n);
 +#else
 +	return (((unsigned long long) ntohl (n)) << 32) + ntohl (n >> 32);
 +#endif
 +} /* unsigned long long ntohll */
 +
 +unsigned long long htonll (unsigned long long n)
 +{
 +#if BYTE_ORDER == BIG_ENDIAN
 +	return (n);
 +#else
 +	return (((unsigned long long) htonl (n)) << 32) + htonl (n >> 32);
 +#endif
 +} /* unsigned long long htonll */
 +#endif /* HAVE_HTONLL */
 +
 +#if FP_LAYOUT_NEED_NOTHING
 +/* Well, we need nothing.. */
 +/* #endif FP_LAYOUT_NEED_NOTHING */
 +
 +#elif FP_LAYOUT_NEED_ENDIANFLIP || FP_LAYOUT_NEED_INTSWAP
 +# if FP_LAYOUT_NEED_ENDIANFLIP
 +#  define FP_CONVERT(A) ((((uint64_t)(A) & 0xff00000000000000LL) >> 56) | \
 +                         (((uint64_t)(A) & 0x00ff000000000000LL) >> 40) | \
 +                         (((uint64_t)(A) & 0x0000ff0000000000LL) >> 24) | \
 +                         (((uint64_t)(A) & 0x000000ff00000000LL) >> 8)  | \
 +                         (((uint64_t)(A) & 0x00000000ff000000LL) << 8)  | \
 +                         (((uint64_t)(A) & 0x0000000000ff0000LL) << 24) | \
 +                         (((uint64_t)(A) & 0x000000000000ff00LL) << 40) | \
 +                         (((uint64_t)(A) & 0x00000000000000ffLL) << 56))
 +# else
 +#  define FP_CONVERT(A) ((((uint64_t)(A) & 0xffffffff00000000LL) >> 32) | \
 +                         (((uint64_t)(A) & 0x00000000ffffffffLL) << 32))
 +# endif
 +
 +double ntohd (double d)
 +{
 +	union
 +	{
 +		uint8_t  byte[8];
 +		uint64_t integer;
 +		double   floating;
 +	} ret;
 +
 +	ret.floating = d;
 +
 +	/* NAN in x86 byte order */
 +	if ((ret.byte[0] == 0x00) && (ret.byte[1] == 0x00)
 +			&& (ret.byte[2] == 0x00) && (ret.byte[3] == 0x00)
 +			&& (ret.byte[4] == 0x00) && (ret.byte[5] == 0x00)
 +			&& (ret.byte[6] == 0xf8) && (ret.byte[7] == 0x7f))
 +	{
 +		return (NAN);
 +	}
 +	else
 +	{
 +		uint64_t tmp;
 +
 +		tmp = ret.integer;
 +		ret.integer = FP_CONVERT (tmp);
 +		return (ret.floating);
 +	}
 +} /* double ntohd */
 +
 +double htond (double d)
 +{
 +	union
 +	{
 +		uint8_t  byte[8];
 +		uint64_t integer;
 +		double   floating;
 +	} ret;
 +
 +	if (isnan (d))
 +	{
 +		ret.byte[0] = ret.byte[1] = ret.byte[2] = ret.byte[3] = 0x00;
 +		ret.byte[4] = ret.byte[5] = 0x00;
 +		ret.byte[6] = 0xf8;
 +		ret.byte[7] = 0x7f;
 +		return (ret.floating);
 +	}
 +	else
 +	{
 +		uint64_t tmp;
 +
 +		ret.floating = d;
 +		tmp = FP_CONVERT (ret.integer);
 +		ret.integer = tmp;
 +		return (ret.floating);
 +	}
 +} /* double htond */
 +#endif /* FP_LAYOUT_NEED_ENDIANFLIP || FP_LAYOUT_NEED_INTSWAP */
 +
 +int format_name (char *ret, int ret_len,
 +		const char *hostname,
 +		const char *plugin, const char *plugin_instance,
 +		const char *type, const char *type_instance)
 +{
 +  char *buffer;
 +  size_t buffer_size;
 +
 +  buffer = ret;
 +  buffer_size = (size_t) ret_len;
 +
 +#define APPEND(str) do {                                               \
 +  size_t l = strlen (str);                                             \
 +  if (l >= buffer_size)                                                \
 +    return (ENOBUFS);                                                  \
 +  memcpy (buffer, (str), l);                                           \
 +  buffer += l; buffer_size -= l;                                       \
 +} while (0)
 +
 +  assert (plugin != NULL);
 +  assert (type != NULL);
 +
 +  APPEND (hostname);
 +  APPEND ("/");
 +  APPEND (plugin);
 +  if ((plugin_instance != NULL) && (plugin_instance[0] != 0))
 +  {
 +    APPEND ("-");
 +    APPEND (plugin_instance);
 +  }
 +  APPEND ("/");
 +  APPEND (type);
 +  if ((type_instance != NULL) && (type_instance[0] != 0))
 +  {
 +    APPEND ("-");
 +    APPEND (type_instance);
 +  }
 +  assert (buffer_size > 0);
 +  buffer[0] = 0;
 +
 +#undef APPEND
 +  return (0);
 +} /* int format_name */
 +
 +int format_values (char *ret, size_t ret_len, /* {{{ */
 +		const data_set_t *ds, const value_list_t *vl,
 +		_Bool store_rates)
 +{
 +        size_t offset = 0;
 +        int status;
 +        int i;
 +        gauge_t *rates = NULL;
 +
 +        assert (0 == strcmp (ds->type, vl->type));
 +
 +        memset (ret, 0, ret_len);
 +
 +#define BUFFER_ADD(...) do { \
 +        status = ssnprintf (ret + offset, ret_len - offset, \
 +                        __VA_ARGS__); \
 +        if (status < 1) \
 +        { \
 +                sfree (rates); \
 +                return (-1); \
 +        } \
 +        else if (((size_t) status) >= (ret_len - offset)) \
 +        { \
 +                sfree (rates); \
 +                return (-1); \
 +        } \
 +        else \
 +                offset += ((size_t) status); \
 +} while (0)
 +
 +        BUFFER_ADD ("%.3f", CDTIME_T_TO_DOUBLE (vl->time));
 +
 +        for (i = 0; i < ds->ds_num; i++)
 +        {
 +                if (ds->ds[i].type == DS_TYPE_GAUGE)
 +                        BUFFER_ADD (":%f", vl->values[i].gauge);
 +                else if (store_rates)
 +                {
 +                        if (rates == NULL)
 +                                rates = uc_get_rate (ds, vl);
 +                        if (rates == NULL)
 +                        {
 +                                WARNING ("format_values: "
 +						"uc_get_rate failed.");
 +                                return (-1);
 +                        }
 +                        BUFFER_ADD (":%g", rates[i]);
 +                }
 +                else if (ds->ds[i].type == DS_TYPE_COUNTER)
 +                        BUFFER_ADD (":%llu", vl->values[i].counter);
 +                else if (ds->ds[i].type == DS_TYPE_DERIVE)
 +                        BUFFER_ADD (":%"PRIi64, vl->values[i].derive);
 +                else if (ds->ds[i].type == DS_TYPE_ABSOLUTE)
 +                        BUFFER_ADD (":%"PRIu64, vl->values[i].absolute);
 +                else
 +                {
 +                        ERROR ("format_values plugin: Unknown data source type: %i",
 +                                        ds->ds[i].type);
 +                        sfree (rates);
 +                        return (-1);
 +                }
 +        } /* for ds->ds_num */
 +
 +#undef BUFFER_ADD
 +
 +        sfree (rates);
 +        return (0);
 +} /* }}} int format_values */
 +
 +int parse_identifier (char *str, char **ret_host,
 +		char **ret_plugin, char **ret_plugin_instance,
 +		char **ret_type, char **ret_type_instance)
 +{
 +	char *hostname = NULL;
 +	char *plugin = NULL;
 +	char *plugin_instance = NULL;
 +	char *type = NULL;
 +	char *type_instance = NULL;
 +
 +	hostname = str;
 +	if (hostname == NULL)
 +		return (-1);
 +
 +	plugin = strchr (hostname, '/');
 +	if (plugin == NULL)
 +		return (-1);
 +	*plugin = '\0'; plugin++;
 +
 +	type = strchr (plugin, '/');
 +	if (type == NULL)
 +		return (-1);
 +	*type = '\0'; type++;
 +
 +	plugin_instance = strchr (plugin, '-');
 +	if (plugin_instance != NULL)
 +	{
 +		*plugin_instance = '\0';
 +		plugin_instance++;
 +	}
 +
 +	type_instance = strchr (type, '-');
 +	if (type_instance != NULL)
 +	{
 +		*type_instance = '\0';
 +		type_instance++;
 +	}
 +
 +	*ret_host = hostname;
 +	*ret_plugin = plugin;
 +	*ret_plugin_instance = plugin_instance;
 +	*ret_type = type;
 +	*ret_type_instance = type_instance;
 +	return (0);
 +} /* int parse_identifier */
 +
 +int parse_identifier_vl (const char *str, value_list_t *vl) /* {{{ */
 +{
 +	char str_copy[6 * DATA_MAX_NAME_LEN];
 +	char *host = NULL;
 +	char *plugin = NULL;
 +	char *plugin_instance = NULL;
 +	char *type = NULL;
 +	char *type_instance = NULL;
 +	int status;
 +
 +	if ((str == NULL) || (vl == NULL))
 +		return (EINVAL);
 +
 +	sstrncpy (str_copy, str, sizeof (str_copy));
 +
 +	status = parse_identifier (str_copy, &host,
 +			&plugin, &plugin_instance,
 +			&type, &type_instance);
 +	if (status != 0)
 +		return (status);
 +
 +	sstrncpy (vl->host, host, sizeof (vl->host));
 +	sstrncpy (vl->plugin, plugin, sizeof (vl->plugin));
 +	sstrncpy (vl->plugin_instance,
 +			(plugin_instance != NULL) ? plugin_instance : "",
 +			sizeof (vl->plugin_instance));
 +	sstrncpy (vl->type, type, sizeof (vl->type));
 +	sstrncpy (vl->type_instance,
 +			(type_instance != NULL) ? type_instance : "",
 +			sizeof (vl->type_instance));
 +
 +	return (0);
 +} /* }}} int parse_identifier_vl */
 +
 +int parse_value (const char *value_orig, value_t *ret_value, int ds_type)
 +{
 +  char *value;
 +  char *endptr = NULL;
 +  size_t value_len;
 +
 +  if (value_orig == NULL)
 +    return (EINVAL);
 +
 +  value = strdup (value_orig);
 +  if (value == NULL)
 +    return (ENOMEM);
 +  value_len = strlen (value);
 +
 +  while ((value_len > 0) && isspace ((int) value[value_len - 1]))
 +  {
 +    value[value_len - 1] = 0;
 +    value_len--;
 +  }
 +
 +  switch (ds_type)
 +  {
 +    case DS_TYPE_COUNTER:
 +      ret_value->counter = (counter_t) strtoull (value, &endptr, 0);
 +      break;
 +
 +    case DS_TYPE_GAUGE:
 +      ret_value->gauge = (gauge_t) strtod (value, &endptr);
 +      break;
 +
 +    case DS_TYPE_DERIVE:
 +      ret_value->derive = (derive_t) strtoll (value, &endptr, 0);
 +      break;
 +
 +    case DS_TYPE_ABSOLUTE:
 +      ret_value->absolute = (absolute_t) strtoull (value, &endptr, 0);
 +      break;
 +
 +    default:
 +      sfree (value);
 +      ERROR ("parse_value: Invalid data source type: %i.", ds_type);
 +      return -1;
 +  }
 +
 +  if (value == endptr) {
 +    ERROR ("parse_value: Failed to parse string as %s: %s.",
 +        DS_TYPE_TO_STRING (ds_type), value);
 +    sfree (value);
 +    return -1;
 +  }
 +  else if ((NULL != endptr) && ('\0' != *endptr))
 +    INFO ("parse_value: Ignoring trailing garbage \"%s\" after %s value. "
 +        "Input string was \"%s\".",
 +        endptr, DS_TYPE_TO_STRING (ds_type), value_orig);
 +
 +  sfree (value);
 +  return 0;
 +} /* int parse_value */
 +
 +int parse_values (char *buffer, value_list_t *vl, const data_set_t *ds)
 +{
 +	int i;
 +	char *dummy;
 +	char *ptr;
 +	char *saveptr;
 +
 +	i = -1;
 +	dummy = buffer;
 +	saveptr = NULL;
 +	while ((ptr = strtok_r (dummy, ":", &saveptr)) != NULL)
 +	{
 +		dummy = NULL;
 +
 +		if (i >= vl->values_len)
 +		{
 +			/* Make sure i is invalid. */
 +			i = vl->values_len + 1;
 +			break;
 +		}
 +
 +		if (i == -1)
 +		{
 +			if (strcmp ("N", ptr) == 0)
 +				vl->time = cdtime ();
 +			else
 +			{
 +				char *endptr = NULL;
 +				double tmp;
 +
 +				errno = 0;
 +				tmp = strtod (ptr, &endptr);
 +				if ((errno != 0)                    /* Overflow */
 +						|| (endptr == ptr)  /* Invalid string */
 +						|| (endptr == NULL) /* This should not happen */
 +						|| (*endptr != 0))  /* Trailing chars */
 +					return (-1);
 +
 +				vl->time = DOUBLE_TO_CDTIME_T (tmp);
 +			}
 +		}
 +		else
 +		{
 +			if ((strcmp ("U", ptr) == 0) && (ds->ds[i].type == DS_TYPE_GAUGE))
 +				vl->values[i].gauge = NAN;
 +			else if (0 != parse_value (ptr, &vl->values[i], ds->ds[i].type))
 +				return -1;
 +		}
 +
 +		i++;
 +	} /* while (strtok_r) */
 +
 +	if ((ptr != NULL) || (i != vl->values_len))
 +		return (-1);
 +	return (0);
 +} /* int parse_values */
 +
 +#if !HAVE_GETPWNAM_R
 +int getpwnam_r (const char *name, struct passwd *pwbuf, char *buf,
 +		size_t buflen, struct passwd **pwbufp)
 +{
 +	int status = 0;
 +	struct passwd *pw;
 +
 +	memset (pwbuf, '\0', sizeof (struct passwd));
 +
 +	pthread_mutex_lock (&getpwnam_r_lock);
 +
 +	do
 +	{
 +		pw = getpwnam (name);
 +		if (pw == NULL)
 +		{
 +			status = (errno != 0) ? errno : ENOENT;
 +			break;
 +		}
 +
 +#define GETPWNAM_COPY_MEMBER(member) \
 +		if (pw->member != NULL) \
 +		{ \
 +			int len = strlen (pw->member); \
 +			if (len >= buflen) \
 +			{ \
 +				status = ENOMEM; \
 +				break; \
 +			} \
 +			sstrncpy (buf, pw->member, buflen); \
 +			pwbuf->member = buf; \
 +			buf    += (len + 1); \
 +			buflen -= (len + 1); \
 +		}
 +		GETPWNAM_COPY_MEMBER(pw_name);
 +		GETPWNAM_COPY_MEMBER(pw_passwd);
 +		GETPWNAM_COPY_MEMBER(pw_gecos);
 +		GETPWNAM_COPY_MEMBER(pw_dir);
 +		GETPWNAM_COPY_MEMBER(pw_shell);
 +
 +		pwbuf->pw_uid = pw->pw_uid;
 +		pwbuf->pw_gid = pw->pw_gid;
 +
 +		if (pwbufp != NULL)
 +			*pwbufp = pwbuf;
 +	} while (0);
 +
 +	pthread_mutex_unlock (&getpwnam_r_lock);
 +
 +	return (status);
 +} /* int getpwnam_r */
 +#endif /* !HAVE_GETPWNAM_R */
 +
 +int notification_init (notification_t *n, int severity, const char *message,
 +		const char *host,
 +		const char *plugin, const char *plugin_instance,
 +		const char *type, const char *type_instance)
 +{
 +	memset (n, '\0', sizeof (notification_t));
 +
 +	n->severity = severity;
 +
 +	if (message != NULL)
 +		sstrncpy (n->message, message, sizeof (n->message));
 +	if (host != NULL)
 +		sstrncpy (n->host, host, sizeof (n->host));
 +	if (plugin != NULL)
 +		sstrncpy (n->plugin, plugin, sizeof (n->plugin));
 +	if (plugin_instance != NULL)
 +		sstrncpy (n->plugin_instance, plugin_instance,
 +				sizeof (n->plugin_instance));
 +	if (type != NULL)
 +		sstrncpy (n->type, type, sizeof (n->type));
 +	if (type_instance != NULL)
 +		sstrncpy (n->type_instance, type_instance,
 +				sizeof (n->type_instance));
 +
 +	return (0);
 +} /* int notification_init */
 +
 +int walk_directory (const char *dir, dirwalk_callback_f callback,
 +		void *user_data, int include_hidden)
 +{
 +	struct dirent *ent;
 +	DIR *dh;
 +	int success;
 +	int failure;
 +
 +	success = 0;
 +	failure = 0;
 +
 +	if ((dh = opendir (dir)) == NULL)
 +	{
 +		char errbuf[1024];
 +		ERROR ("walk_directory: Cannot open '%s': %s", dir,
 +				sstrerror (errno, errbuf, sizeof (errbuf)));
 +		return -1;
 +	}
 +
 +	while ((ent = readdir (dh)) != NULL)
 +	{
 +		int status;
 +
 +		if (include_hidden)
 +		{
 +			if ((strcmp (".", ent->d_name) == 0)
 +					|| (strcmp ("..", ent->d_name) == 0))
 +				continue;
 +		}
 +		else /* if (!include_hidden) */
 +		{
 +			if (ent->d_name[0]=='.')
 +				continue;
 +		}
 +
 +		status = (*callback) (dir, ent->d_name, user_data);
 +		if (status != 0)
 +			failure++;
 +		else
 +			success++;
 +	}
 +
 +	closedir (dh);
 +
 +	if ((success == 0) && (failure > 0))
 +		return (-1);
 +	return (0);
 +}
 +
 +ssize_t read_file_contents (const char *filename, char *buf, size_t bufsize)
 +{
 +	FILE *fh;
 +	ssize_t ret;
 +
 +	fh = fopen (filename, "r");
 +	if (fh == NULL)
 +		return (-1);
 +
 +	ret = (ssize_t) fread (buf, 1, bufsize, fh);
 +	if ((ret == 0) && (ferror (fh) != 0))
 +	{
 +		ERROR ("read_file_contents: Reading file \"%s\" failed.",
 +				filename);
 +		ret = -1;
 +	}
 +
 +	fclose(fh);
 +	return (ret);
 +}
 +
 +counter_t counter_diff (counter_t old_value, counter_t new_value)
 +{
 +	counter_t diff;
 +
 +	if (old_value > new_value)
 +	{
 +		if (old_value <= 4294967295U)
 +			diff = (4294967295U - old_value) + new_value;
 +		else
 +			diff = (18446744073709551615ULL - old_value)
 +				+ new_value;
 +	}
 +	else
 +	{
 +		diff = new_value - old_value;
 +	}
 +
 +	return (diff);
 +} /* counter_t counter_diff */
 +
 +int rate_to_value (value_t *ret_value, gauge_t rate, /* {{{ */
 +		rate_to_value_state_t *state,
 +		int ds_type, cdtime_t t)
 +{
 +	gauge_t delta_gauge;
 +	cdtime_t delta_t;
 +
 +	if (ds_type == DS_TYPE_GAUGE)
 +	{
 +		state->last_value.gauge = rate;
 +		state->last_time = t;
 +
 +		*ret_value = state->last_value;
 +		return (0);
 +	}
 +
 +	/* Counter and absolute can't handle negative rates. Reset "last time"
 +	 * to zero, so that the next valid rate will re-initialize the
 +	 * structure. */
 +	if ((rate < 0.0)
 +			&& ((ds_type == DS_TYPE_COUNTER)
 +				|| (ds_type == DS_TYPE_ABSOLUTE)))
 +	{
 +		memset (state, 0, sizeof (*state));
 +		return (EINVAL);
 +	}
 +
 +	/* Another invalid state: The time is not increasing. */
 +	if (t <= state->last_time)
 +	{
 +		memset (state, 0, sizeof (*state));
 +		return (EINVAL);
 +	}
 +
 +	delta_t = t - state->last_time;
 +	delta_gauge = (rate * CDTIME_T_TO_DOUBLE (delta_t)) + state->residual;
 +
 +	/* Previous value is invalid. */
 +	if (state->last_time == 0) /* {{{ */
 +	{
 +		if (ds_type == DS_TYPE_DERIVE)
 +		{
 +			state->last_value.derive = (derive_t) rate;
 +			state->residual = rate - ((gauge_t) state->last_value.derive);
 +		}
 +		else if (ds_type == DS_TYPE_COUNTER)
 +		{
 +			state->last_value.counter = (counter_t) rate;
 +			state->residual = rate - ((gauge_t) state->last_value.counter);
 +		}
 +		else if (ds_type == DS_TYPE_ABSOLUTE)
 +		{
 +			state->last_value.absolute = (absolute_t) rate;
 +			state->residual = rate - ((gauge_t) state->last_value.absolute);
 +		}
 +		else
 +		{
 +			assert (23 == 42);
 +		}
 +
 +		state->last_time = t;
 +		return (EAGAIN);
 +	} /* }}} */
 +
 +	if (ds_type == DS_TYPE_DERIVE)
 +	{
 +		derive_t delta_derive = (derive_t) delta_gauge;
 +
 +		state->last_value.derive += delta_derive;
 +		state->residual = delta_gauge - ((gauge_t) delta_derive);
 +	}
 +	else if (ds_type == DS_TYPE_COUNTER)
 +	{
 +		counter_t delta_counter = (counter_t) delta_gauge;
 +
 +		state->last_value.counter += delta_counter;
 +		state->residual = delta_gauge - ((gauge_t) delta_counter);
 +	}
 +	else if (ds_type == DS_TYPE_ABSOLUTE)
 +	{
 +		absolute_t delta_absolute = (absolute_t) delta_gauge;
 +
 +		state->last_value.absolute = delta_absolute;
 +		state->residual = delta_gauge - ((gauge_t) delta_absolute);
 +	}
 +	else
 +	{
 +		assert (23 == 42);
 +	}
 +
 +        state->last_time = t;
 +	*ret_value = state->last_value;
 +	return (0);
 +} /* }}} value_t rate_to_value */
 +
 +int value_to_rate (value_t *ret_rate, derive_t value, /* {{{ */
 +		value_to_rate_state_t *state,
 +		int ds_type, cdtime_t t)
 +{
 +	double interval;
 +
 +	/* Another invalid state: The time is not increasing. */
 +	if (t <= state->last_time)
 +	{
 +		memset (state, 0, sizeof (*state));
 +		return (EINVAL);
 +	}
 +
 +	interval = CDTIME_T_TO_DOUBLE(t - state->last_time);
 +
 +	/* Previous value is invalid. */
 +	if (state->last_time == 0) /* {{{ */
 +	{
 +		if (ds_type == DS_TYPE_DERIVE)
 +		{
 +			state->last_value.derive = value;
 +		}
 +		else if (ds_type == DS_TYPE_COUNTER)
 +		{
 +			state->last_value.counter = (counter_t) value;
 +		}
 +		else if (ds_type == DS_TYPE_ABSOLUTE)
 +		{
 +			state->last_value.absolute = (absolute_t) value;
 +		}
 +		else
 +		{
 +			assert (23 == 42);
 +		}
 +
 +		state->last_time = t;
 +		return (EAGAIN);
 +	} /* }}} */
 +
 +	if (ds_type == DS_TYPE_DERIVE)
 +	{
 +		ret_rate->gauge = (value - state->last_value.derive) / interval;
 +		state->last_value.derive = value;
 +	}
 +	else if (ds_type == DS_TYPE_COUNTER)
 +	{
 +		ret_rate->gauge = (((counter_t)value) - state->last_value.counter) / interval;
 +		state->last_value.counter = (counter_t) value;
 +	}
 +	else if (ds_type == DS_TYPE_ABSOLUTE)
 +	{
 +		ret_rate->gauge = (((absolute_t)value) - state->last_value.absolute) / interval;
 +		state->last_value.absolute = (absolute_t) value;
 +	}
 +	else
 +	{
 +		assert (23 == 42);
 +	}
 +
 +        state->last_time = t;
 +	return (0);
 +} /* }}} value_t rate_to_value */
 +
 +int service_name_to_port_number (const char *service_name)
 +{
 +	struct addrinfo *ai_list;
 +	struct addrinfo *ai_ptr;
 +	struct addrinfo ai_hints;
 +	int status;
 +	int service_number;
 +
 +	if (service_name == NULL)
 +		return (-1);
 +
 +	ai_list = NULL;
 +	memset (&ai_hints, 0, sizeof (ai_hints));
 +	ai_hints.ai_family = AF_UNSPEC;
 +
 +	status = getaddrinfo (/* node = */ NULL, service_name,
 +			&ai_hints, &ai_list);
 +	if (status != 0)
 +	{
 +		ERROR ("service_name_to_port_number: getaddrinfo failed: %s",
 +				gai_strerror (status));
 +		return (-1);
 +	}
 +
 +	service_number = -1;
 +	for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
 +	{
 +		if (ai_ptr->ai_family == AF_INET)
 +		{
 +			struct sockaddr_in *sa;
 +
 +			sa = (void *) ai_ptr->ai_addr;
 +			service_number = (int) ntohs (sa->sin_port);
 +		}
 +		else if (ai_ptr->ai_family == AF_INET6)
 +		{
 +			struct sockaddr_in6 *sa;
 +
 +			sa = (void *) ai_ptr->ai_addr;
 +			service_number = (int) ntohs (sa->sin6_port);
 +		}
 +
 +		if ((service_number > 0) && (service_number <= 65535))
 +			break;
 +	}
 +
 +	freeaddrinfo (ai_list);
 +
 +	if ((service_number > 0) && (service_number <= 65535))
 +		return (service_number);
 +	return (-1);
 +} /* int service_name_to_port_number */
 +
 +int strtoderive (const char *string, derive_t *ret_value) /* {{{ */
 +{
 +	derive_t tmp;
 +	char *endptr;
 +
 +	if ((string == NULL) || (ret_value == NULL))
 +		return (EINVAL);
 +
 +	errno = 0;
 +	endptr = NULL;
 +	tmp = (derive_t) strtoll (string, &endptr, /* base = */ 0);
 +	if ((endptr == string) || (errno != 0))
 +		return (-1);
 +
 +	*ret_value = tmp;
 +	return (0);
 +} /* }}} int strtoderive */
 +
 +int strtogauge (const char *string, gauge_t *ret_value) /* {{{ */
 +{
 +	gauge_t tmp;
 +	char *endptr = NULL;
 +
 +	if ((string == NULL) || (ret_value == NULL))
 +		return (EINVAL);
 +
 +	errno = 0;
 +	endptr = NULL;
 +	tmp = (gauge_t) strtod (string, &endptr);
 +	if (errno != 0)
 +		return (errno);
 +	else if ((endptr == NULL) || (*endptr != 0))
 +		return (EINVAL);
 +
 +	*ret_value = tmp;
 +	return (0);
 +} /* }}} int strtogauge */
 +
 +int strarray_add (char ***ret_array, size_t *ret_array_len, char const *str) /* {{{ */
 +{
 +	char **array;
 +	size_t array_len = *ret_array_len;
 +
 +	if (str == NULL)
 +		return (EINVAL);
 +
 +	array = realloc (*ret_array,
 +            (array_len + 1) * sizeof (*array));
 +	if (array == NULL)
 +		return (ENOMEM);
 +	*ret_array = array;
 +
 +	array[array_len] = strdup (str);
 +	if (array[array_len] == NULL)
 +		return (ENOMEM);
 +
 +	array_len++;
 +        *ret_array_len = array_len;
 +	return (0);
 +} /* }}} int strarray_add */
 +
 +void strarray_free (char **array, size_t array_len) /* {{{ */
 +{
 +	size_t i;
 +
 +	for (i = 0; i < array_len; i++)
 +		sfree (array[i]);
 +	sfree (array);
 +} /* }}} void strarray_free */
diff --cc src/daemon/filter_chain.c
index c87b8773,00000000..b93435fd
mode 100644,000000..100644
--- a/src/daemon/filter_chain.c
+++ b/src/daemon/filter_chain.c
@@@ -1,1058 -1,0 +1,1079 @@@
 +/**
 + * collectd - src/filter_chain.c
 + * Copyright (C) 2008-2010  Florian octo Forster
 + *
 + * Permission is hereby granted, free of charge, to any person obtaining a
 + * copy of this software and associated documentation files (the "Software"),
 + * to deal in the Software without restriction, including without limitation
 + * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 + * and/or sell copies of the Software, and to permit persons to whom the
 + * Software is furnished to do so, subject to the following conditions:
 + *
 + * The above copyright notice and this permission notice shall be included in
 + * all copies or substantial portions of the Software.
 + *
 + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 + * DEALINGS IN THE SOFTWARE.
 + *
 + * Authors:
 + *   Florian octo Forster <octo at collectd.org>
 + **/
 +
 +#include "collectd.h"
 +#include "configfile.h"
 +#include "plugin.h"
 +#include "utils_complain.h"
 +#include "common.h"
 +#include "filter_chain.h"
 +
 +/*
 + * Data types
 + */
 +/* List of matches, used in fc_rule_t and for the global `match_list_head'
 + * variable. */
 +struct fc_match_s;
 +typedef struct fc_match_s fc_match_t; /* {{{ */
 +struct fc_match_s
 +{
 +  char name[DATA_MAX_NAME_LEN];
 +  match_proc_t proc;
 +  void *user_data;
 +  fc_match_t *next;
 +}; /* }}} */
 +
 +/* List of targets, used in fc_rule_t and for the global `target_list_head'
 + * variable. */
 +struct fc_target_s;
 +typedef struct fc_target_s fc_target_t; /* {{{ */
 +struct fc_target_s
 +{
 +  char name[DATA_MAX_NAME_LEN];
 +  void *user_data;
 +  target_proc_t proc;
 +  fc_target_t *next;
 +}; /* }}} */
 +
 +/* List of rules, used in fc_chain_t */
 +struct fc_rule_s;
 +typedef struct fc_rule_s fc_rule_t; /* {{{ */
 +struct fc_rule_s
 +{
 +  char name[DATA_MAX_NAME_LEN];
 +  fc_match_t  *matches;
 +  fc_target_t *targets;
 +  fc_rule_t *next;
 +}; /* }}} */
 +
 +/* List of chains, used for `chain_list_head' */
 +struct fc_chain_s /* {{{ */
 +{
 +  char name[DATA_MAX_NAME_LEN];
 +  fc_rule_t   *rules;
 +  fc_target_t *targets;
 +  fc_chain_t  *next;
 +}; /* }}} */
 +
++/* Writer configuration. */
++struct fc_writer_s;
++typedef struct fc_writer_s fc_writer_t; /* {{{ */
++struct fc_writer_s
++{
++  char *plugin;
++  c_complain_t complaint;
++}; /* }}} */
++
 +/*
 + * Global variables
 + */
 +static fc_match_t  *match_list_head;
 +static fc_target_t *target_list_head;
 +static fc_chain_t  *chain_list_head;
 +
 +/*
 + * Private functions
 + */
 +static void fc_free_matches (fc_match_t *m) /* {{{ */
 +{
 +  if (m == NULL)
 +    return;
 +
 +  if (m->proc.destroy != NULL)
 +    (*m->proc.destroy) (&m->user_data);
 +  else if (m->user_data != NULL)
 +  {
 +    ERROR ("Filter subsystem: fc_free_matches: There is user data, but no "
 +        "destroy functions has been specified. "
 +        "Memory will probably be lost!");
 +  }
 +
 +  if (m->next != NULL)
 +    fc_free_matches (m->next);
 +
 +  free (m);
 +} /* }}} void fc_free_matches */
 +
 +static void fc_free_targets (fc_target_t *t) /* {{{ */
 +{
 +  if (t == NULL)
 +    return;
 +
 +  if (t->proc.destroy != NULL)
 +    (*t->proc.destroy) (&t->user_data);
 +  else if (t->user_data != NULL)
 +  {
 +    ERROR ("Filter subsystem: fc_free_targets: There is user data, but no "
 +        "destroy functions has been specified. "
 +        "Memory will probably be lost!");
 +  }
 +
 +  if (t->next != NULL)
 +    fc_free_targets (t->next);
 +
 +  free (t);
 +} /* }}} void fc_free_targets */
 +
 +static void fc_free_rules (fc_rule_t *r) /* {{{ */
 +{
 +  if (r == NULL)
 +    return;
 +
 +  fc_free_matches (r->matches);
 +  fc_free_targets (r->targets);
 +
 +  if (r->next != NULL)
 +    fc_free_rules (r->next);
 +
 +  free (r);
 +} /* }}} void fc_free_rules */
 +
 +static void fc_free_chains (fc_chain_t *c) /* {{{ */
 +{
 +  if (c == NULL)
 +    return;
 +
 +  fc_free_rules (c->rules);
 +  fc_free_targets (c->targets);
 +
 +  if (c->next != NULL)
 +    fc_free_chains (c->next);
 +
 +  free (c);
 +} /* }}} void fc_free_chains */
 +
 +static char *fc_strdup (const char *orig) /* {{{ */
 +{
 +  size_t sz;
 +  char *dest;
 +
 +  if (orig == NULL)
 +    return (NULL);
 +
 +  sz = strlen (orig) + 1;
 +  dest = (char *) malloc (sz);
 +  if (dest == NULL)
 +    return (NULL);
 +
 +  memcpy (dest, orig, sz);
 +
 +  return (dest);
 +} /* }}} char *fc_strdup */
 +
 +/*
 + * Configuration.
 + *
 + * The configuration looks somewhat like this:
 + *
 + *  <Chain "PreCache">
 + *    <Rule>
 + *      <Match "regex">
 + *        Plugin "^mysql$"
 + *        Type "^mysql_command$"
 + *        TypeInstance "^show_"
 + *      </Match>
 + *      <Target "drop">
 + *      </Target>
 + *    </Rule>
 + *
 + *    <Target "write">
 + *      Plugin "rrdtool"
 + *    </Target>
 + *  </Chain>
 + */
 +static int fc_config_add_match (fc_match_t **matches_head, /* {{{ */
 +    oconfig_item_t *ci)
 +{
 +  fc_match_t *m;
 +  fc_match_t *ptr;
 +  int status;
 +
 +  if ((ci->values_num != 1)
 +      || (ci->values[0].type != OCONFIG_TYPE_STRING))
 +  {
 +    WARNING ("Filter subsystem: `Match' blocks require "
 +        "exactly one string argument.");
 +    return (-1);
 +  }
 +
 +  ptr = match_list_head;
 +  while (ptr != NULL)
 +  {
 +    if (strcasecmp (ptr->name, ci->values[0].value.string) == 0)
 +      break;
 +    ptr = ptr->next;
 +  }
 +
 +  if (ptr == NULL)
 +  {
 +    WARNING ("Filter subsystem: Cannot find a \"%s\" match. "
 +        "Did you load the appropriate plugin?",
 +        ci->values[0].value.string);
 +    return (-1);
 +  }
 +
 +  m = (fc_match_t *) malloc (sizeof (*m));
 +  if (m == NULL)
 +  {
 +    ERROR ("fc_config_add_match: malloc failed.");
 +    return (-1);
 +  }
 +  memset (m, 0, sizeof (*m));
 +
 +  sstrncpy (m->name, ptr->name, sizeof (m->name));
 +  memcpy (&m->proc, &ptr->proc, sizeof (m->proc));
 +  m->user_data = NULL;
 +  m->next = NULL;
 +
 +  if (m->proc.create != NULL)
 +  {
 +    status = (*m->proc.create) (ci, &m->user_data);
 +    if (status != 0)
 +    {
 +      WARNING ("Filter subsystem: Failed to create a %s match.",
 +          m->name);
 +      fc_free_matches (m);
 +      return (-1);
 +    }
 +  }
 +
 +  if (*matches_head != NULL)
 +  {
 +    ptr = *matches_head;
 +    while (ptr->next != NULL)
 +      ptr = ptr->next;
 +
 +    ptr->next = m;
 +  }
 +  else
 +  {
 +    *matches_head = m;
 +  }
 +
 +  return (0);
 +} /* }}} int fc_config_add_match */
 +
 +static int fc_config_add_target (fc_target_t **targets_head, /* {{{ */
 +    oconfig_item_t *ci)
 +{
 +  fc_target_t *t;
 +  fc_target_t *ptr;
 +  int status;
 +
 +  if ((ci->values_num != 1)
 +      || (ci->values[0].type != OCONFIG_TYPE_STRING))
 +  {
 +    WARNING ("Filter subsystem: `Target' blocks require "
 +        "exactly one string argument.");
 +    return (-1);
 +  }
 +
 +  ptr = target_list_head;
 +  while (ptr != NULL)
 +  {
 +    if (strcasecmp (ptr->name, ci->values[0].value.string) == 0)
 +      break;
 +    ptr = ptr->next;
 +  }
 +
 +  if (ptr == NULL)
 +  {
 +    WARNING ("Filter subsystem: Cannot find a \"%s\" target. "
 +        "Did you load the appropriate plugin?",
 +        ci->values[0].value.string);
 +    return (-1);
 +  }
 +
 +  t = (fc_target_t *) malloc (sizeof (*t));
 +  if (t == NULL)
 +  {
 +    ERROR ("fc_config_add_target: malloc failed.");
 +    return (-1);
 +  }
 +  memset (t, 0, sizeof (*t));
 +
 +  sstrncpy (t->name, ptr->name, sizeof (t->name));
 +  memcpy (&t->proc, &ptr->proc, sizeof (t->proc));
 +  t->user_data = NULL;
 +  t->next = NULL;
 +
 +  if (t->proc.create != NULL)
 +  {
 +    status = (*t->proc.create) (ci, &t->user_data);
 +    if (status != 0)
 +    {
 +      WARNING ("Filter subsystem: Failed to create a %s target.",
 +          t->name);
 +      fc_free_targets (t);
 +      return (-1);
 +    }
 +  }
 +  else
 +  {
 +    t->user_data = NULL;
 +  }
 +  
 +  if (*targets_head != NULL)
 +  {
 +    ptr = *targets_head;
 +    while (ptr->next != NULL)
 +      ptr = ptr->next;
 +
 +    ptr->next = t;
 +  }
 +  else
 +  {
 +    *targets_head = t;
 +  }
 +
 +  return (0);
 +} /* }}} int fc_config_add_target */
 +
 +static int fc_config_add_rule (fc_chain_t *chain, /* {{{ */
 +    oconfig_item_t *ci)
 +{
 +  fc_rule_t *rule;
 +  char rule_name[2*DATA_MAX_NAME_LEN] = "Unnamed rule";
 +  int status = 0;
 +  int i;
 +
 +  if (ci->values_num > 1)
 +  {
 +    WARNING ("Filter subsystem: `Rule' blocks have at most one argument.");
 +    return (-1);
 +  }
 +  else if ((ci->values_num == 1)
 +      && (ci->values[0].type != OCONFIG_TYPE_STRING))
 +  {
 +    WARNING ("Filter subsystem: `Rule' blocks expect one string argument "
 +        "or no argument at all.");
 +    return (-1);
 +  }
 +
 +  rule = (fc_rule_t *) malloc (sizeof (*rule));
 +  if (rule == NULL)
 +  {
 +    ERROR ("fc_config_add_rule: malloc failed.");
 +    return (-1);
 +  }
 +  memset (rule, 0, sizeof (*rule));
 +  rule->next = NULL;
 +
 +  if (ci->values_num == 1)
 +  {
 +    sstrncpy (rule->name, ci->values[0].value.string, sizeof (rule->name));
 +    ssnprintf (rule_name, sizeof (rule_name), "Rule \"%s\"",
 +        ci->values[0].value.string);
 +  }
 +
 +  for (i = 0; i < ci->children_num; i++)
 +  {
 +    oconfig_item_t *option = ci->children + i;
 +    status = 0;
 +
 +    if (strcasecmp ("Match", option->key) == 0)
 +      status = fc_config_add_match (&rule->matches, option);
 +    else if (strcasecmp ("Target", option->key) == 0)
 +      status = fc_config_add_target (&rule->targets, option);
 +    else
 +    {
 +      WARNING ("Filter subsystem: %s: Option `%s' not allowed "
 +          "inside a <Rule> block.", rule_name, option->key);
 +      status = -1;
 +    }
 +
 +    if (status != 0)
 +      break;
 +  } /* for (ci->children) */
 +
 +  /* Additional sanity checking. */
 +  while (status == 0)
 +  {
 +    if (rule->targets == NULL)
 +    {
 +      WARNING ("Filter subsystem: %s: No target has been specified.",
 +          rule_name);
 +      status = -1;
 +      break;
 +    }
 +
 +    break;
 +  } /* while (status == 0) */
 +
 +  if (status != 0)
 +  {
 +    fc_free_rules (rule);
 +    return (-1);
 +  }
 +
 +  if (chain->rules != NULL)
 +  {
 +    fc_rule_t *ptr;
 +
 +    ptr = chain->rules;
 +    while (ptr->next != NULL)
 +      ptr = ptr->next;
 +
 +    ptr->next = rule;
 +  }
 +  else
 +  {
 +    chain->rules = rule;
 +  }
 +
 +  return (0);
 +} /* }}} int fc_config_add_rule */
 +
 +static int fc_config_add_chain (const oconfig_item_t *ci) /* {{{ */
 +{
 +  fc_chain_t *chain = NULL;
 +  int status = 0;
 +  int i;
 +  int new_chain = 1;
 +
 +  if ((ci->values_num != 1)
 +      || (ci->values[0].type != OCONFIG_TYPE_STRING))
 +  {
 +    WARNING ("Filter subsystem: <Chain> blocks require exactly one "
 +        "string argument.");
 +    return (-1);
 +  }
 +
 +  if (chain_list_head != NULL)
 +  {
 +    if ((chain = fc_chain_get_by_name (ci->values[0].value.string)) != NULL)
 +      new_chain = 0;
 +  }
 +
 +  if (chain == NULL)
 +  {
 +    chain = (fc_chain_t *) malloc (sizeof (*chain));
 +    if (chain == NULL)
 +    {
 +      ERROR ("fc_config_add_chain: malloc failed.");
 +      return (-1);
 +    }
 +    memset (chain, 0, sizeof (*chain));
 +    sstrncpy (chain->name, ci->values[0].value.string, sizeof (chain->name));
 +    chain->rules = NULL;
 +    chain->targets = NULL;
 +    chain->next = NULL;
 +  }
 +
 +  for (i = 0; i < ci->children_num; i++)
 +  {
 +    oconfig_item_t *option = ci->children + i;
 +    status = 0;
 +
 +    if (strcasecmp ("Rule", option->key) == 0)
 +      status = fc_config_add_rule (chain, option);
 +    else if (strcasecmp ("Target", option->key) == 0)
 +      status = fc_config_add_target (&chain->targets, option);
 +    else
 +    {
 +      WARNING ("Filter subsystem: Chain %s: Option `%s' not allowed "
 +          "inside a <Chain> block.", chain->name, option->key);
 +      status = -1;
 +    }
 +
 +    if (status != 0)
 +      break;
 +  } /* for (ci->children) */
 +
 +  if (status != 0)
 +  {
 +    fc_free_chains (chain);
 +    return (-1);
 +  }
 +
 +  if (chain_list_head != NULL)
 +  {
 +    if (!new_chain)
 +      return (0);
 +
 +    fc_chain_t *ptr;
 +
 +    ptr = chain_list_head;
 +    while (ptr->next != NULL)
 +      ptr = ptr->next;
 +
 +    ptr->next = chain;
 +  }
 +  else
 +  {
 +    chain_list_head = chain;
 +  }
 +
 +  return (0);
 +} /* }}} int fc_config_add_chain */
 +
 +/*
 + * Built-in target "jump"
 + *
 + * Prefix `bit' like `_b_uilt-_i_n _t_arget'
 + */
 +static int fc_bit_jump_create (const oconfig_item_t *ci, /* {{{ */
 +    void **user_data)
 +{
 +  oconfig_item_t *ci_chain;
 +
 +  if (ci->children_num != 1)
 +  {
 +    ERROR ("Filter subsystem: The built-in target `jump' needs exactly "
 +        "one `Chain' argument!");
 +    return (-1);
 +  }
 +
 +  ci_chain = ci->children;
 +  if (strcasecmp ("Chain", ci_chain->key) != 0)
 +  {
 +    ERROR ("Filter subsystem: The built-in target `jump' does not "
 +        "support the configuration option `%s'.",
 +        ci_chain->key);
 +    return (-1);
 +  }
 +
 +  if ((ci_chain->values_num != 1)
 +      || (ci_chain->values[0].type != OCONFIG_TYPE_STRING))
 +  {
 +    ERROR ("Filter subsystem: Built-in target `jump': The `Chain' option "
 +        "needs exactly one string argument.");
 +    return (-1);
 +  }
 +
 +  *user_data = fc_strdup (ci_chain->values[0].value.string);
 +  if (*user_data == NULL)
 +  {
 +    ERROR ("fc_bit_jump_create: fc_strdup failed.");
 +    return (-1);
 +  }
 +
 +  return (0);
 +} /* }}} int fc_bit_jump_create */
 +
 +static int fc_bit_jump_destroy (void **user_data) /* {{{ */
 +{
 +  if (user_data != NULL)
 +  {
 +    free (*user_data);
 +    *user_data = NULL;
 +  }
 +
 +  return (0);
 +} /* }}} int fc_bit_jump_destroy */
 +
 +static int fc_bit_jump_invoke (const data_set_t *ds, /* {{{ */
 +    value_list_t *vl, notification_meta_t __attribute__((unused)) **meta,
 +    void **user_data)
 +{
 +  char *chain_name;
 +  fc_chain_t *chain;
 +  int status;
 +
 +  chain_name = *user_data;
 +
 +  for (chain = chain_list_head; chain != NULL; chain = chain->next)
 +    if (strcasecmp (chain_name, chain->name) == 0)
 +      break;
 +
 +  if (chain == NULL)
 +  {
 +    ERROR ("Filter subsystem: Built-in target `jump': There is no chain "
 +        "named `%s'.", chain_name);
 +    return (-1);
 +  }
 +
 +  status = fc_process_chain (ds, vl, chain);
 +  if (status < 0)
 +    return (status);
 +  else if (status == FC_TARGET_STOP)
 +    return (FC_TARGET_STOP);
 +  else
 +    return (FC_TARGET_CONTINUE);
 +} /* }}} int fc_bit_jump_invoke */
 +
 +static int fc_bit_stop_invoke (const data_set_t __attribute__((unused)) *ds, /* {{{ */
 +    value_list_t __attribute__((unused)) *vl,
 +    notification_meta_t __attribute__((unused)) **meta,
 +    void __attribute__((unused)) **user_data)
 +{
 +  return (FC_TARGET_STOP);
 +} /* }}} int fc_bit_stop_invoke */
 +
 +static int fc_bit_return_invoke (const data_set_t __attribute__((unused)) *ds, /* {{{ */
 +    value_list_t __attribute__((unused)) *vl,
 +    notification_meta_t __attribute__((unused)) **meta,
 +    void __attribute__((unused)) **user_data)
 +{
 +  return (FC_TARGET_RETURN);
 +} /* }}} int fc_bit_return_invoke */
 +
 +static int fc_bit_write_create (const oconfig_item_t *ci, /* {{{ */
 +    void **user_data)
 +{
 +  int i;
 +
-   char **plugin_list;
-   size_t plugin_list_len;
- 
-   plugin_list = NULL;
-   plugin_list_len = 0;
++  fc_writer_t *plugin_list = NULL;
++  size_t plugin_list_len = 0;
 +
 +  for (i = 0; i < ci->children_num; i++)
 +  {
 +    oconfig_item_t *child = ci->children + i;
-     char **temp;
++    fc_writer_t *temp;
 +    int j;
 +
 +    if (strcasecmp ("Plugin", child->key) != 0)
 +    {
 +      ERROR ("Filter subsystem: The built-in target `write' does not "
 +          "support the configuration option `%s'.",
 +          child->key);
 +      continue;
 +    }
 +
 +    for (j = 0; j < child->values_num; j++)
 +    {
++      char *plugin;
++
 +      if (child->values[j].type != OCONFIG_TYPE_STRING)
 +      {
 +        ERROR ("Filter subsystem: Built-in target `write': "
 +            "The `Plugin' option accepts only string arguments.");
 +        continue;
 +      }
++      plugin = child->values[j].value.string;
 +
-       temp = (char **) realloc (plugin_list, (plugin_list_len + 2)
++      temp = (fc_writer_t *) realloc (plugin_list, (plugin_list_len + 2)
 +          * (sizeof (*plugin_list)));
 +      if (temp == NULL)
 +      {
 +        ERROR ("fc_bit_write_create: realloc failed.");
 +        continue;
 +      }
 +      plugin_list = temp;
 +
-       plugin_list[plugin_list_len] = fc_strdup (child->values[j].value.string);
-       if (plugin_list[plugin_list_len] == NULL)
++      plugin_list[plugin_list_len].plugin = fc_strdup (plugin);
++      if (plugin_list[plugin_list_len].plugin == NULL)
 +      {
 +        ERROR ("fc_bit_write_create: fc_strdup failed.");
 +        continue;
 +      }
++      C_COMPLAIN_INIT (&plugin_list[plugin_list_len].complaint);
 +      plugin_list_len++;
-       plugin_list[plugin_list_len] = NULL;
++      plugin_list[plugin_list_len].plugin = NULL;
 +    } /* for (j = 0; j < child->values_num; j++) */
 +  } /* for (i = 0; i < ci->children_num; i++) */
 +
 +  *user_data = plugin_list;
 +
 +  return (0);
 +} /* }}} int fc_bit_write_create */
 +
 +static int fc_bit_write_destroy (void **user_data) /* {{{ */
 +{
-   char **plugin_list;
++  fc_writer_t *plugin_list;
 +  size_t i;
 +
 +  if ((user_data == NULL) || (*user_data == NULL))
 +    return (0);
 +
 +  plugin_list = *user_data;
 +
-   for (i = 0; plugin_list[i] != NULL; i++)
-     free (plugin_list[i]);
++  for (i = 0; plugin_list[i].plugin != NULL; i++)
++    free (plugin_list[i].plugin);
 +  free (plugin_list);
 +
 +  return (0);
 +} /* }}} int fc_bit_write_destroy */
 +
 +static int fc_bit_write_invoke (const data_set_t *ds, /* {{{ */
 +    value_list_t *vl, notification_meta_t __attribute__((unused)) **meta,
 +    void **user_data)
 +{
-   char **plugin_list;
++  fc_writer_t *plugin_list;
 +  int status;
 +
 +  plugin_list = NULL;
 +  if (user_data != NULL)
 +    plugin_list = *user_data;
 +
-   if ((plugin_list == NULL) || (plugin_list[0] == NULL))
++  if ((plugin_list == NULL) || (plugin_list[0].plugin == NULL))
 +  {
-     static c_complain_t enoent_complaint = C_COMPLAIN_INIT_STATIC;
++    static c_complain_t write_complaint = C_COMPLAIN_INIT_STATIC;
 +
 +    status = plugin_write (/* plugin = */ NULL, ds, vl);
 +    if (status == ENOENT)
 +    {
 +      /* in most cases this is a permanent error, so use the complain
 +       * mechanism rather than spamming the logs */
-       c_complain (LOG_INFO, &enoent_complaint,
++      c_complain (LOG_INFO, &write_complaint,
 +          "Filter subsystem: Built-in target `write': Dispatching value to "
 +          "all write plugins failed with status %i (ENOENT). "
 +          "Most likely this means you didn't load any write plugins.",
 +          status);
 +    }
 +    else if (status != 0)
 +    {
-       INFO ("Filter subsystem: Built-in target `write': Dispatching value to "
++      /* often, this is a permanent error (e.g. target system unavailable),
++       * so use the complain mechanism rather than spamming the logs */
++      c_complain (LOG_INFO, &write_complaint,
++          "Filter subsystem: Built-in target `write': Dispatching value to "
 +          "all write plugins failed with status %i.", status);
 +    }
 +    else
 +    {
 +      assert (status == 0);
-       c_release (LOG_INFO, &enoent_complaint, "Filter subsystem: "
++      c_release (LOG_INFO, &write_complaint, "Filter subsystem: "
 +          "Built-in target `write': Some write plugin is back to normal "
 +          "operation. `write' succeeded.");
 +    }
 +  }
 +  else
 +  {
 +    size_t i;
 +
-     for (i = 0; plugin_list[i] != NULL; i++)
++    for (i = 0; plugin_list[i].plugin != NULL; i++)
 +    {
-       status = plugin_write (plugin_list[i], ds, vl);
++      status = plugin_write (plugin_list[i].plugin, ds, vl);
 +      if (status != 0)
 +      {
-         INFO ("Filter subsystem: Built-in target `write': Dispatching value to "
-             "the `%s' plugin failed with status %i.", plugin_list[i], status);
++        c_complain (LOG_INFO, &plugin_list[i].complaint,
++            "Filter subsystem: Built-in target `write': Dispatching value to "
++            "the `%s' plugin failed with status %i.",
++            plugin_list[i].plugin, status);
++      }
++      else
++      {
++        c_release (LOG_INFO, &plugin_list[i].complaint,
++            "Filter subsystem: Built-in target `write': Plugin `%s' is back "
++            "to normal operation. `write' succeeded.", plugin_list[i].plugin);
 +      }
 +    } /* for (i = 0; plugin_list[i] != NULL; i++) */
 +  }
 +
 +  return (FC_TARGET_CONTINUE);
 +} /* }}} int fc_bit_write_invoke */
 +
 +static int fc_init_once (void) /* {{{ */
 +{
 +  static int done = 0;
 +  target_proc_t tproc;
 +
 +  if (done != 0)
 +    return (0);
 +
 +  memset (&tproc, 0, sizeof (tproc));
 +  tproc.create  = fc_bit_jump_create;
 +  tproc.destroy = fc_bit_jump_destroy;
 +  tproc.invoke  = fc_bit_jump_invoke;
 +  fc_register_target ("jump", tproc);
 +
 +  memset (&tproc, 0, sizeof (tproc));
 +  tproc.create  = NULL;
 +  tproc.destroy = NULL;
 +  tproc.invoke  = fc_bit_stop_invoke;
 +  fc_register_target ("stop", tproc);
 +
 +  memset (&tproc, 0, sizeof (tproc));
 +  tproc.create  = NULL;
 +  tproc.destroy = NULL;
 +  tproc.invoke  = fc_bit_return_invoke;
 +  fc_register_target ("return", tproc);
 +
 +  memset (&tproc, 0, sizeof (tproc));
 +  tproc.create  = fc_bit_write_create;
 +  tproc.destroy = fc_bit_write_destroy;
 +  tproc.invoke  = fc_bit_write_invoke;
 +  fc_register_target ("write", tproc);
 +
 +  done++;
 +  return (0);
 +} /* }}} int fc_init_once */
 +
 +/*
 + * Public functions
 + */
 +/* Add a match to list of available matches. */
 +int fc_register_match (const char *name, match_proc_t proc) /* {{{ */
 +{
 +  fc_match_t *m;
 +
 +  DEBUG ("fc_register_match (%s);", name);
 +
 +  m = (fc_match_t *) malloc (sizeof (*m));
 +  if (m == NULL)
 +    return (-ENOMEM);
 +  memset (m, 0, sizeof (*m));
 +
 +  sstrncpy (m->name, name, sizeof (m->name));
 +  memcpy (&m->proc, &proc, sizeof (m->proc));
 +  m->next = NULL;
 +
 +  if (match_list_head == NULL)
 +  {
 +    match_list_head = m;
 +  }
 +  else
 +  {
 +    fc_match_t *ptr;
 +
 +    ptr = match_list_head;
 +    while (ptr->next != NULL)
 +      ptr = ptr->next;
 +
 +    ptr->next = m;
 +  }
 +
 +  return (0);
 +} /* }}} int fc_register_match */
 +
 +/* Add a target to list of available targets. */
 +int fc_register_target (const char *name, target_proc_t proc) /* {{{ */
 +{
 +  fc_target_t *t;
 +
 +  DEBUG ("fc_register_target (%s);", name);
 +
 +  t = (fc_target_t *) malloc (sizeof (*t));
 +  if (t == NULL)
 +    return (-ENOMEM);
 +  memset (t, 0, sizeof (*t));
 +
 +  sstrncpy (t->name, name, sizeof (t->name));
 +  memcpy (&t->proc, &proc, sizeof (t->proc));
 +  t->next = NULL;
 +
 +  if (target_list_head == NULL)
 +  {
 +    target_list_head = t;
 +  }
 +  else
 +  {
 +    fc_target_t *ptr;
 +
 +    ptr = target_list_head;
 +    while (ptr->next != NULL)
 +      ptr = ptr->next;
 +
 +    ptr->next = t;
 +  }
 +
 +  return (0);
 +} /* }}} int fc_register_target */
 +
 +fc_chain_t *fc_chain_get_by_name (const char *chain_name) /* {{{ */
 +{
 +  fc_chain_t *chain;
 +
 +  if (chain_name == NULL)
 +    return (NULL);
 +
 +  for (chain = chain_list_head; chain != NULL; chain = chain->next)
 +    if (strcasecmp (chain_name, chain->name) == 0)
 +      return (chain);
 +
 +  return (NULL);
 +} /* }}} int fc_chain_get_by_name */
 +
 +int fc_process_chain (const data_set_t *ds, value_list_t *vl, /* {{{ */
 +    fc_chain_t *chain)
 +{
 +  fc_rule_t *rule;
 +  fc_target_t *target;
 +  int status;
 +
 +  if (chain == NULL)
 +    return (-1);
 +
 +  DEBUG ("fc_process_chain (chain = %s);", chain->name);
 +
 +  status = FC_TARGET_CONTINUE;
 +  for (rule = chain->rules; rule != NULL; rule = rule->next)
 +  {
 +    fc_match_t *match;
 +
 +    if (rule->name[0] != 0)
 +    {
 +      DEBUG ("fc_process_chain (%s): Testing the `%s' rule.",
 +          chain->name, rule->name);
 +    }
 +
 +    /* N. B.: rule->matches may be NULL. */
 +    for (match = rule->matches; match != NULL; match = match->next)
 +    {
 +      /* FIXME: Pass the meta-data to match targets here (when implemented). */
 +      status = (*match->proc.match) (ds, vl, /* meta = */ NULL,
 +          &match->user_data);
 +      if (status < 0)
 +      {
 +        WARNING ("fc_process_chain (%s): A match failed.", chain->name);
 +        break;
 +      }
 +      else if (status != FC_MATCH_MATCHES)
 +        break;
 +    }
 +
 +    /* for-loop has been aborted: Either error or no match. */
 +    if (match != NULL)
 +    {
 +      status = FC_TARGET_CONTINUE;
 +      continue;
 +    }
 +
 +    if (rule->name[0] != 0)
 +    {
 +      DEBUG ("fc_process_chain (%s): Rule `%s' matches.",
 +          chain->name, rule->name);
 +    }
 +
 +    for (target = rule->targets; target != NULL; target = target->next)
 +    {
 +      /* If we get here, all matches have matched the value. Execute the
 +       * target. */
 +      /* FIXME: Pass the meta-data to match targets here (when implemented). */
 +      status = (*target->proc.invoke) (ds, vl, /* meta = */ NULL,
 +          &target->user_data);
 +      if (status < 0)
 +      {
 +        WARNING ("fc_process_chain (%s): A target failed.", chain->name);
 +        continue;
 +      }
 +      else if (status == FC_TARGET_CONTINUE)
 +        continue;
 +      else if (status == FC_TARGET_STOP)
 +        break;
 +      else if (status == FC_TARGET_RETURN)
 +        break;
 +      else
 +      {
 +        WARNING ("fc_process_chain (%s): Unknown return value "
 +            "from target `%s': %i",
 +            chain->name, target->name, status);
 +      }
 +    }
 +
 +    if ((status == FC_TARGET_STOP)
 +        || (status == FC_TARGET_RETURN))
 +    {
 +      if (rule->name[0] != 0)
 +      {
 +        DEBUG ("fc_process_chain (%s): Rule `%s' signaled "
 +            "the %s condition.",
 +            chain->name, rule->name,
 +            (status == FC_TARGET_STOP) ? "stop" : "return");
 +      }
 +      break;
 +    }
 +    else
 +    {
 +      status = FC_TARGET_CONTINUE;
 +    }
 +  } /* for (rule) */
 +
 +  if (status == FC_TARGET_STOP)
 +    return (FC_TARGET_STOP);
 +  else if (status == FC_TARGET_RETURN)
 +    return (FC_TARGET_CONTINUE);
 +
 +  /* for-loop has been aborted: A target returned `FC_TARGET_STOP' */
 +  if (rule != NULL)
 +    return (FC_TARGET_CONTINUE);
 +
 +  DEBUG ("fc_process_chain (%s): Executing the default targets.",
 +      chain->name);
 +
 +  status = FC_TARGET_CONTINUE;
 +  for (target = chain->targets; target != NULL; target = target->next)
 +  {
 +    /* If we get here, all matches have matched the value. Execute the
 +     * target. */
 +    /* FIXME: Pass the meta-data to match targets here (when implemented). */
 +    status = (*target->proc.invoke) (ds, vl, /* meta = */ NULL,
 +        &target->user_data);
 +    if (status < 0)
 +    {
 +      WARNING ("fc_process_chain (%s): The default target failed.",
 +          chain->name);
 +    }
 +    else if (status == FC_TARGET_CONTINUE)
 +      continue;
 +    else if (status == FC_TARGET_STOP)
 +      break;
 +    else if (status == FC_TARGET_RETURN)
 +      break;
 +    else
 +    {
 +      WARNING ("fc_process_chain (%s): Unknown return value "
 +          "from target `%s': %i",
 +          chain->name, target->name, status);
 +    }
 +  }
 +
 +  if ((status == FC_TARGET_STOP)
 +      || (status == FC_TARGET_RETURN))
 +  {
 +    assert (target != NULL);
 +    DEBUG ("fc_process_chain (%s): Default target `%s' signaled "
 +        "the %s condition.",
 +        chain->name, target->name,
 +        (status == FC_TARGET_STOP) ? "stop" : "return");
 +    if (status == FC_TARGET_STOP)
 +      return (FC_TARGET_STOP);
 +    else
 +      return (FC_TARGET_CONTINUE);
 +  }
 +
 +  DEBUG ("fc_process_chain (%s): Signaling `continue' at end of chain.",
 +      chain->name);
 +
 +  return (FC_TARGET_CONTINUE);
 +} /* }}} int fc_process_chain */
 +
 +/* Iterate over all rules in the chain and execute all targets for which all
 + * matches match. */
 +int fc_default_action (const data_set_t *ds, value_list_t *vl) /* {{{ */
 +{
 +  /* FIXME: Pass the meta-data to match targets here (when implemented). */
 +  return (fc_bit_write_invoke (ds, vl,
 +        /* meta = */ NULL, /* user_data = */ NULL));
 +} /* }}} int fc_default_action */
 +
 +int fc_configure (const oconfig_item_t *ci) /* {{{ */
 +{
 +  fc_init_once ();
 +
 +  if (ci == NULL)
 +    return (-EINVAL);
 +
 +  if (strcasecmp ("Chain", ci->key) == 0)
 +    return (fc_config_add_chain (ci));
 +
 +  WARNING ("Filter subsystem: Unknown top level config option `%s'.",
 +      ci->key);
 +
 +  return (-1);
 +} /* }}} int fc_configure */
 +
 +/* vim: set sw=2 sts=2 et fdm=marker : */
diff --cc src/daemon/plugin.c
index 97b794f7,00000000..6c6ab63c
mode 100644,000000..100644
--- a/src/daemon/plugin.c
+++ b/src/daemon/plugin.c
@@@ -1,2652 -1,0 +1,2652 @@@
 +/**
 + * collectd - src/plugin.c
 + * Copyright (C) 2005-2014  Florian octo Forster
 + *
 + * Permission is hereby granted, free of charge, to any person obtaining a
 + * copy of this software and associated documentation files (the "Software"),
 + * to deal in the Software without restriction, including without limitation
 + * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 + * and/or sell copies of the Software, and to permit persons to whom the
 + * Software is furnished to do so, subject to the following conditions:
 + *
 + * The above copyright notice and this permission notice shall be included in
 + * all copies or substantial portions of the Software.
 + *
 + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 + * DEALINGS IN THE SOFTWARE.
 + *
 + * Authors:
 + *   Florian octo Forster <octo at collectd.org>
 + *   Sebastian Harl <sh at tokkee.org>
 + **/
 +
 +#include "collectd.h"
 +#include "common.h"
 +#include "plugin.h"
 +#include "configfile.h"
 +#include "filter_chain.h"
 +#include "utils_avltree.h"
 +#include "utils_cache.h"
 +#include "utils_complain.h"
 +#include "utils_llist.h"
 +#include "utils_heap.h"
 +#include "utils_time.h"
 +#include "utils_random.h"
 +
 +#include <ltdl.h>
 +
 +/*
 + * Private structures
 + */
 +struct callback_func_s
 +{
 +	void *cf_callback;
 +	user_data_t cf_udata;
 +	plugin_ctx_t cf_ctx;
 +};
 +typedef struct callback_func_s callback_func_t;
 +
 +#define RF_SIMPLE  0
 +#define RF_COMPLEX 1
 +#define RF_REMOVE  65535
 +struct read_func_s
 +{
 +	/* `read_func_t' "inherits" from `callback_func_t'.
 +	 * The `rf_super' member MUST be the first one in this structure! */
 +#define rf_callback rf_super.cf_callback
 +#define rf_udata rf_super.cf_udata
 +#define rf_ctx rf_super.cf_ctx
 +	callback_func_t rf_super;
 +	char rf_group[DATA_MAX_NAME_LEN];
 +	char *rf_name;
 +	int rf_type;
 +	cdtime_t rf_interval;
 +	cdtime_t rf_effective_interval;
 +	cdtime_t rf_next_read;
 +};
 +typedef struct read_func_s read_func_t;
 +
 +struct write_queue_s;
 +typedef struct write_queue_s write_queue_t;
 +struct write_queue_s
 +{
 +	value_list_t *vl;
 +	plugin_ctx_t ctx;
 +	write_queue_t *next;
 +};
 +
 +/*
 + * Private variables
 + */
 +static c_avl_tree_t *plugins_loaded = NULL;
 +
 +static llist_t *list_init;
 +static llist_t *list_write;
 +static llist_t *list_flush;
 +static llist_t *list_missing;
 +static llist_t *list_shutdown;
 +static llist_t *list_log;
 +static llist_t *list_notification;
 +
 +static fc_chain_t *pre_cache_chain = NULL;
 +static fc_chain_t *post_cache_chain = NULL;
 +
 +static c_avl_tree_t *data_sets;
 +
 +static char *plugindir = NULL;
 +
 +#ifndef DEFAULT_MAX_READ_INTERVAL
 +# define DEFAULT_MAX_READ_INTERVAL TIME_T_TO_CDTIME_T (86400)
 +#endif
 +static c_heap_t       *read_heap = NULL;
 +static llist_t        *read_list;
 +static int             read_loop = 1;
 +static pthread_mutex_t read_lock = PTHREAD_MUTEX_INITIALIZER;
 +static pthread_cond_t  read_cond = PTHREAD_COND_INITIALIZER;
 +static pthread_t      *read_threads = NULL;
 +static int             read_threads_num = 0;
 +static cdtime_t        max_read_interval = DEFAULT_MAX_READ_INTERVAL;
 +
 +static write_queue_t  *write_queue_head;
 +static write_queue_t  *write_queue_tail;
 +static long            write_queue_length = 0;
 +static _Bool           write_loop = 1;
 +static pthread_mutex_t write_lock = PTHREAD_MUTEX_INITIALIZER;
 +static pthread_cond_t  write_cond = PTHREAD_COND_INITIALIZER;
 +static pthread_t      *write_threads = NULL;
 +static size_t          write_threads_num = 0;
 +
 +static pthread_key_t   plugin_ctx_key;
 +static _Bool           plugin_ctx_key_initialized = 0;
 +
 +static long            write_limit_high = 0;
 +static long            write_limit_low = 0;
 +
 +static derive_t        stats_values_dropped = 0;
 +static _Bool           record_statistics = 0;
 +
 +/*
 + * Static functions
 + */
 +static int plugin_dispatch_values_internal (value_list_t *vl);
 +
 +static const char *plugin_get_dir (void)
 +{
 +	if (plugindir == NULL)
 +		return (PLUGINDIR);
 +	else
 +		return (plugindir);
 +}
 +
 +static void plugin_update_internal_statistics (void) { /* {{{ */
 +	derive_t copy_write_queue_length;
 +	value_list_t vl = VALUE_LIST_INIT;
 +	value_t values[2];
 +
 +	copy_write_queue_length = write_queue_length;
 +
 +	/* Initialize `vl' */
 +	vl.values = values;
 +	vl.values_len = 2;
 +	vl.time = 0;
 +	sstrncpy (vl.host, hostname_g, sizeof (vl.host));
 +	sstrncpy (vl.plugin, "collectd", sizeof (vl.plugin));
 +
 +	vl.type_instance[0] = 0;
 +	vl.values_len = 1;
 +
 +	/* Write queue */
 +	sstrncpy (vl.plugin_instance, "write_queue",
 +			sizeof (vl.plugin_instance));
 +
 +	/* Write queue : queue length */
 +	vl.values[0].gauge = (gauge_t) copy_write_queue_length;
 +	sstrncpy (vl.type, "queue_length", sizeof (vl.type));
 +	vl.type_instance[0] = 0;
 +	plugin_dispatch_values (&vl);
 +
 +	/* Write queue : Values dropped (queue length > low limit) */
 +	vl.values[0].derive = (derive_t) stats_values_dropped;
 +	sstrncpy (vl.type, "derive", sizeof (vl.type));
 +	sstrncpy (vl.type_instance, "dropped", sizeof (vl.type_instance));
 +	plugin_dispatch_values (&vl);
 +
 +	/* Cache */
 +	sstrncpy (vl.plugin_instance, "cache",
 +			sizeof (vl.plugin_instance));
 +
 +	/* Cache : Nb entry in cache tree */
 +	vl.values[0].gauge = (gauge_t) uc_get_size();
 +	sstrncpy (vl.type, "cache_size", sizeof (vl.type));
 +	vl.type_instance[0] = 0;
 +	plugin_dispatch_values (&vl);
 +
 +	return;
 +} /* }}} void plugin_update_internal_statistics */
 +
 +static void destroy_callback (callback_func_t *cf) /* {{{ */
 +{
 +	if (cf == NULL)
 +		return;
 +
 +	if ((cf->cf_udata.data != NULL) && (cf->cf_udata.free_func != NULL))
 +	{
 +		cf->cf_udata.free_func (cf->cf_udata.data);
 +		cf->cf_udata.data = NULL;
 +		cf->cf_udata.free_func = NULL;
 +	}
 +	sfree (cf);
 +} /* }}} void destroy_callback */
 +
 +static void destroy_all_callbacks (llist_t **list) /* {{{ */
 +{
 +	llentry_t *le;
 +
 +	if (*list == NULL)
 +		return;
 +
 +	le = llist_head (*list);
 +	while (le != NULL)
 +	{
 +		llentry_t *le_next;
 +
 +		le_next = le->next;
 +
 +		sfree (le->key);
 +		destroy_callback (le->value);
 +		le->value = NULL;
 +
 +		le = le_next;
 +	}
 +
 +	llist_destroy (*list);
 +	*list = NULL;
 +} /* }}} void destroy_all_callbacks */
 +
 +static void destroy_read_heap (void) /* {{{ */
 +{
 +	if (read_heap == NULL)
 +		return;
 +
 +	while (42)
 +	{
 +		callback_func_t *cf;
 +
 +		cf = c_heap_get_root (read_heap);
 +		if (cf == NULL)
 +			break;
 +
 +		destroy_callback (cf);
 +	}
 +
 +	c_heap_destroy (read_heap);
 +	read_heap = NULL;
 +} /* }}} void destroy_read_heap */
 +
 +static int register_callback (llist_t **list, /* {{{ */
 +		const char *name, callback_func_t *cf)
 +{
 +	llentry_t *le;
 +	char *key;
 +
 +	if (*list == NULL)
 +	{
 +		*list = llist_create ();
 +		if (*list == NULL)
 +		{
 +			ERROR ("plugin: register_callback: "
 +					"llist_create failed.");
 +			destroy_callback (cf);
 +			return (-1);
 +		}
 +	}
 +
 +	key = strdup (name);
 +	if (key == NULL)
 +	{
 +		ERROR ("plugin: register_callback: strdup failed.");
 +		destroy_callback (cf);
 +		return (-1);
 +	}
 +
 +	le = llist_search (*list, name);
 +	if (le == NULL)
 +	{
 +		le = llentry_create (key, cf);
 +		if (le == NULL)
 +		{
 +			ERROR ("plugin: register_callback: "
 +					"llentry_create failed.");
 +			free (key);
 +			destroy_callback (cf);
 +			return (-1);
 +		}
 +
 +		llist_append (*list, le);
 +	}
 +	else
 +	{
 +		callback_func_t *old_cf;
 +
 +		old_cf = le->value;
 +		le->value = cf;
 +
 +		WARNING ("plugin: register_callback: "
 +				"a callback named `%s' already exists - "
 +				"overwriting the old entry!", name);
 +
 +		destroy_callback (old_cf);
 +		sfree (key);
 +	}
 +
 +	return (0);
 +} /* }}} int register_callback */
 +
 +static int create_register_callback (llist_t **list, /* {{{ */
 +		const char *name, void *callback, user_data_t *ud)
 +{
 +	callback_func_t *cf;
 +
 +	cf = (callback_func_t *) malloc (sizeof (*cf));
 +	if (cf == NULL)
 +	{
 +		ERROR ("plugin: create_register_callback: malloc failed.");
 +		return (-1);
 +	}
 +	memset (cf, 0, sizeof (*cf));
 +
 +	cf->cf_callback = callback;
 +	if (ud == NULL)
 +	{
 +		cf->cf_udata.data = NULL;
 +		cf->cf_udata.free_func = NULL;
 +	}
 +	else
 +	{
 +		cf->cf_udata = *ud;
 +	}
 +
 +	cf->cf_ctx = plugin_get_ctx ();
 +
 +	return (register_callback (list, name, cf));
 +} /* }}} int create_register_callback */
 +
 +static int plugin_unregister (llist_t *list, const char *name) /* {{{ */
 +{
 +	llentry_t *e;
 +
 +	if (list == NULL)
 +		return (-1);
 +
 +	e = llist_search (list, name);
 +	if (e == NULL)
 +		return (-1);
 +
 +	llist_remove (list, e);
 +
 +	sfree (e->key);
 +	destroy_callback (e->value);
 +
 +	llentry_destroy (e);
 +
 +	return (0);
 +} /* }}} int plugin_unregister */
 +
 +/*
 + * (Try to) load the shared object `file'. Won't complain if it isn't a shared
 + * object, but it will bitch about a shared object not having a
 + * ``module_register'' symbol..
 + */
 +static int plugin_load_file (char *file, uint32_t flags)
 +{
 +	lt_dlhandle dlh;
 +	void (*reg_handle) (void);
 +
 +	lt_dlinit ();
 +	lt_dlerror (); /* clear errors */
 +
 +#if LIBTOOL_VERSION == 2
 +	if (flags & PLUGIN_FLAGS_GLOBAL) {
 +		lt_dladvise advise;
 +		lt_dladvise_init(&advise);
 +		lt_dladvise_global(&advise);
 +		dlh = lt_dlopenadvise(file, advise);
 +		lt_dladvise_destroy(&advise);
 +	} else {
 +		dlh = lt_dlopen (file);
 +	}
 +#else /* if LIBTOOL_VERSION == 1 */
 +	if (flags & PLUGIN_FLAGS_GLOBAL)
 +		WARNING ("plugin_load_file: The global flag is not supported, "
 +				"libtool 2 is required for this.");
 +	dlh = lt_dlopen (file);
 +#endif
 +
 +	if (dlh == NULL)
 +	{
 +		char errbuf[1024] = "";
 +
 +		ssnprintf (errbuf, sizeof (errbuf),
 +				"lt_dlopen (\"%s\") failed: %s. "
- 				"The most common cause for this problem are "
++				"The most common cause for this problem is "
 +				"missing dependencies. Use ldd(1) to check "
 +				"the dependencies of the plugin "
 +				"/ shared object.",
 +				file, lt_dlerror ());
 +
 +		ERROR ("%s", errbuf);
 +		/* Make sure this is printed to STDERR in any case, but also
 +		 * make sure it's printed only once. */
 +		if (list_log != NULL)
 +			fprintf (stderr, "ERROR: %s\n", errbuf);
 +
 +		return (1);
 +	}
 +
 +	if ((reg_handle = (void (*) (void)) lt_dlsym (dlh, "module_register")) == NULL)
 +	{
 +		WARNING ("Couldn't find symbol \"module_register\" in \"%s\": %s\n",
 +				file, lt_dlerror ());
 +		lt_dlclose (dlh);
 +		return (-1);
 +	}
 +
 +	(*reg_handle) ();
 +
 +	return (0);
 +}
 +
 +static void *plugin_read_thread (void __attribute__((unused)) *args)
 +{
 +	while (read_loop != 0)
 +	{
 +		read_func_t *rf;
 +		plugin_ctx_t old_ctx;
 +		cdtime_t now;
 +		int status;
 +		int rf_type;
 +		int rc;
 +
 +		/* Get the read function that needs to be read next.
 +		 * We don't need to hold "read_lock" for the heap, but we need
 +		 * to call c_heap_get_root() and pthread_cond_wait() in the
 +		 * same protected block. */
 +		pthread_mutex_lock (&read_lock);
 +		rf = c_heap_get_root (read_heap);
 +		if (rf == NULL)
 +		{
 +			pthread_cond_wait (&read_cond, &read_lock);
 +                        pthread_mutex_unlock (&read_lock);
 +			continue;
 +		}
 +		pthread_mutex_unlock (&read_lock);
 +
 +		if (rf->rf_interval == 0)
 +		{
 +			/* this should not happen, because the interval is set
 +			 * for each plugin when loading it
 +			 * XXX: issue a warning? */
 +			rf->rf_interval = plugin_get_interval ();
 +			rf->rf_effective_interval = rf->rf_interval;
 +
 +			rf->rf_next_read = cdtime ();
 +		}
 +
 +		/* sleep until this entry is due,
 +		 * using pthread_cond_timedwait */
 +		pthread_mutex_lock (&read_lock);
 +		/* In pthread_cond_timedwait, spurious wakeups are possible
 +		 * (and really happen, at least on NetBSD with > 1 CPU), thus
 +		 * we need to re-evaluate the condition every time
 +		 * pthread_cond_timedwait returns. */
 +		rc = 0;
 +		while ((read_loop != 0)
 +				&& (cdtime () < rf->rf_next_read)
 +				&& rc == 0)
 +		{
 +			struct timespec ts = { 0 };
 +
 +			CDTIME_T_TO_TIMESPEC (rf->rf_next_read, &ts);
 +
 +			rc = pthread_cond_timedwait (&read_cond, &read_lock,
 +				&ts);
 +		}
 +
 +		/* Must hold `read_lock' when accessing `rf->rf_type'. */
 +		rf_type = rf->rf_type;
 +		pthread_mutex_unlock (&read_lock);
 +
 +		/* Check if we're supposed to stop.. This may have interrupted
 +		 * the sleep, too. */
 +		if (read_loop == 0)
 +		{
 +			/* Insert `rf' again, so it can be free'd correctly */
 +			c_heap_insert (read_heap, rf);
 +			break;
 +		}
 +
 +		/* The entry has been marked for deletion. The linked list
 +		 * entry has already been removed by `plugin_unregister_read'.
 +		 * All we have to do here is free the `read_func_t' and
 +		 * continue. */
 +		if (rf_type == RF_REMOVE)
 +		{
 +			DEBUG ("plugin_read_thread: Destroying the `%s' "
 +					"callback.", rf->rf_name);
 +			sfree (rf->rf_name);
 +			destroy_callback ((callback_func_t *) rf);
 +			rf = NULL;
 +			continue;
 +		}
 +
 +		DEBUG ("plugin_read_thread: Handling `%s'.", rf->rf_name);
 +
 +		old_ctx = plugin_set_ctx (rf->rf_ctx);
 +
 +		if (rf_type == RF_SIMPLE)
 +		{
 +			int (*callback) (void);
 +
 +			callback = rf->rf_callback;
 +			status = (*callback) ();
 +		}
 +		else
 +		{
 +			plugin_read_cb callback;
 +
 +			assert (rf_type == RF_COMPLEX);
 +
 +			callback = rf->rf_callback;
 +			status = (*callback) (&rf->rf_udata);
 +		}
 +
 +		plugin_set_ctx (old_ctx);
 +
 +		/* If the function signals failure, we will increase the
 +		 * intervals in which it will be called. */
 +		if (status != 0)
 +		{
 +			rf->rf_effective_interval *= 2;
 +			if (rf->rf_effective_interval > max_read_interval)
 +				rf->rf_effective_interval = max_read_interval;
 +
 +			NOTICE ("read-function of plugin `%s' failed. "
 +					"Will suspend it for %.3f seconds.",
 +					rf->rf_name,
 +					CDTIME_T_TO_DOUBLE (rf->rf_effective_interval));
 +		}
 +		else
 +		{
 +			/* Success: Restore the interval, if it was changed. */
 +			rf->rf_effective_interval = rf->rf_interval;
 +		}
 +
 +		/* update the ``next read due'' field */
 +		now = cdtime ();
 +
 +		DEBUG ("plugin_read_thread: Effective interval of the "
 +				"%s plugin is %.3f seconds.",
 +				rf->rf_name,
 +				CDTIME_T_TO_DOUBLE (rf->rf_effective_interval));
 +
 +		/* Calculate the next (absolute) time at which this function
 +		 * should be called. */
 +		rf->rf_next_read += rf->rf_effective_interval;
 +
 +		/* Check, if `rf_next_read' is in the past. */
 +		if (rf->rf_next_read < now)
 +		{
 +			/* `rf_next_read' is in the past. Insert `now'
 +			 * so this value doesn't trail off into the
 +			 * past too much. */
 +			rf->rf_next_read = now;
 +		}
 +
 +		DEBUG ("plugin_read_thread: Next read of the %s plugin at %.3f.",
 +				rf->rf_name,
 +				CDTIME_T_TO_DOUBLE (rf->rf_next_read));
 +
 +		/* Re-insert this read function into the heap again. */
 +		c_heap_insert (read_heap, rf);
 +	} /* while (read_loop) */
 +
 +	pthread_exit (NULL);
 +	return ((void *) 0);
 +} /* void *plugin_read_thread */
 +
 +static void start_read_threads (int num)
 +{
 +	int i;
 +
 +	if (read_threads != NULL)
 +		return;
 +
 +	read_threads = (pthread_t *) calloc (num, sizeof (pthread_t));
 +	if (read_threads == NULL)
 +	{
 +		ERROR ("plugin: start_read_threads: calloc failed.");
 +		return;
 +	}
 +
 +	read_threads_num = 0;
 +	for (i = 0; i < num; i++)
 +	{
 +		if (pthread_create (read_threads + read_threads_num, NULL,
 +					plugin_read_thread, NULL) == 0)
 +		{
 +			read_threads_num++;
 +		}
 +		else
 +		{
 +			ERROR ("plugin: start_read_threads: pthread_create failed.");
 +			return;
 +		}
 +	} /* for (i) */
 +} /* void start_read_threads */
 +
 +static void stop_read_threads (void)
 +{
 +	int i;
 +
 +	if (read_threads == NULL)
 +		return;
 +
 +	INFO ("collectd: Stopping %i read threads.", read_threads_num);
 +
 +	pthread_mutex_lock (&read_lock);
 +	read_loop = 0;
 +	DEBUG ("plugin: stop_read_threads: Signalling `read_cond'");
 +	pthread_cond_broadcast (&read_cond);
 +	pthread_mutex_unlock (&read_lock);
 +
 +	for (i = 0; i < read_threads_num; i++)
 +	{
 +		if (pthread_join (read_threads[i], NULL) != 0)
 +		{
 +			ERROR ("plugin: stop_read_threads: pthread_join failed.");
 +		}
 +		read_threads[i] = (pthread_t) 0;
 +	}
 +	sfree (read_threads);
 +	read_threads_num = 0;
 +} /* void stop_read_threads */
 +
 +static void plugin_value_list_free (value_list_t *vl) /* {{{ */
 +{
 +	if (vl == NULL)
 +		return;
 +
 +	meta_data_destroy (vl->meta);
 +	sfree (vl->values);
 +	sfree (vl);
 +} /* }}} void plugin_value_list_free */
 +
 +static value_list_t *plugin_value_list_clone (value_list_t const *vl_orig) /* {{{ */
 +{
 +	value_list_t *vl;
 +
 +	if (vl_orig == NULL)
 +		return (NULL);
 +
 +	vl = malloc (sizeof (*vl));
 +	if (vl == NULL)
 +		return (NULL);
 +	memcpy (vl, vl_orig, sizeof (*vl));
 +
 +	vl->values = calloc (vl_orig->values_len, sizeof (*vl->values));
 +	if (vl->values == NULL)
 +	{
 +		plugin_value_list_free (vl);
 +		return (NULL);
 +	}
 +	memcpy (vl->values, vl_orig->values,
 +			vl_orig->values_len * sizeof (*vl->values));
 +
 +	vl->meta = meta_data_clone (vl->meta);
 +	if ((vl_orig->meta != NULL) && (vl->meta == NULL))
 +	{
 +		plugin_value_list_free (vl);
 +		return (NULL);
 +	}
 +
 +	if (vl->time == 0)
 +		vl->time = cdtime ();
 +
 +	/* Fill in the interval from the thread context, if it is zero. */
 +	if (vl->interval == 0)
 +	{
 +		plugin_ctx_t ctx = plugin_get_ctx ();
 +
 +		if (ctx.interval != 0)
 +			vl->interval = ctx.interval;
 +		else
 +		{
 +			char name[6 * DATA_MAX_NAME_LEN];
 +			FORMAT_VL (name, sizeof (name), vl);
 +			ERROR ("plugin_value_list_clone: Unable to determine "
 +					"interval from context for "
 +					"value list \"%s\". "
 +					"This indicates a broken plugin. "
 +					"Please report this problem to the "
 +					"collectd mailing list or at "
 +					"<http://collectd.org/bugs/>.", name);
 +			vl->interval = cf_get_default_interval ();
 +		}
 +	}
 +
 +	return (vl);
 +} /* }}} value_list_t *plugin_value_list_clone */
 +
 +static int plugin_write_enqueue (value_list_t const *vl) /* {{{ */
 +{
 +	write_queue_t *q;
 +
 +	q = malloc (sizeof (*q));
 +	if (q == NULL)
 +		return (ENOMEM);
 +	q->next = NULL;
 +
 +	q->vl = plugin_value_list_clone (vl);
 +	if (q->vl == NULL)
 +	{
 +		sfree (q);
 +		return (ENOMEM);
 +	}
 +
 +	/* Store context of caller (read plugin); otherwise, it would not be
 +	 * available to the write plugins when actually dispatching the
 +	 * value-list later on. */
 +	q->ctx = plugin_get_ctx ();
 +
 +	pthread_mutex_lock (&write_lock);
 +
 +	if (write_queue_tail == NULL)
 +	{
 +		write_queue_head = q;
 +		write_queue_tail = q;
 +		write_queue_length = 1;
 +	}
 +	else
 +	{
 +		write_queue_tail->next = q;
 +		write_queue_tail = q;
 +		write_queue_length += 1;
 +	}
 +
 +	pthread_cond_signal (&write_cond);
 +	pthread_mutex_unlock (&write_lock);
 +
 +	return (0);
 +} /* }}} int plugin_write_enqueue */
 +
 +static value_list_t *plugin_write_dequeue (void) /* {{{ */
 +{
 +	write_queue_t *q;
 +	value_list_t *vl;
 +
 +	pthread_mutex_lock (&write_lock);
 +
 +	while (write_loop && (write_queue_head == NULL))
 +		pthread_cond_wait (&write_cond, &write_lock);
 +
 +	if (write_queue_head == NULL)
 +	{
 +		pthread_mutex_unlock (&write_lock);
 +		return (NULL);
 +	}
 +
 +	q = write_queue_head;
 +	write_queue_head = q->next;
 +	write_queue_length -= 1;
 +	if (write_queue_head == NULL) {
 +		write_queue_tail = NULL;
 +		assert(0 == write_queue_length);
 +		}
 +
 +	pthread_mutex_unlock (&write_lock);
 +
 +	(void) plugin_set_ctx (q->ctx);
 +
 +	vl = q->vl;
 +	sfree (q);
 +	return (vl);
 +} /* }}} value_list_t *plugin_write_dequeue */
 +
 +static void *plugin_write_thread (void __attribute__((unused)) *args) /* {{{ */
 +{
 +	while (write_loop)
 +	{
 +		value_list_t *vl = plugin_write_dequeue ();
 +		if (vl == NULL)
 +			continue;
 +
 +		plugin_dispatch_values_internal (vl);
 +
 +		plugin_value_list_free (vl);
 +	}
 +
 +	pthread_exit (NULL);
 +	return ((void *) 0);
 +} /* }}} void *plugin_write_thread */
 +
 +static void start_write_threads (size_t num) /* {{{ */
 +{
 +	size_t i;
 +
 +	if (write_threads != NULL)
 +		return;
 +
 +	write_threads = (pthread_t *) calloc (num, sizeof (pthread_t));
 +	if (write_threads == NULL)
 +	{
 +		ERROR ("plugin: start_write_threads: calloc failed.");
 +		return;
 +	}
 +
 +	write_threads_num = 0;
 +	for (i = 0; i < num; i++)
 +	{
 +		int status;
 +
 +		status = pthread_create (write_threads + write_threads_num,
 +				/* attr = */ NULL,
 +				plugin_write_thread,
 +				/* arg = */ NULL);
 +		if (status != 0)
 +		{
 +			char errbuf[1024];
 +			ERROR ("plugin: start_write_threads: pthread_create failed "
 +					"with status %i (%s).", status,
 +					sstrerror (status, errbuf, sizeof (errbuf)));
 +			return;
 +		}
 +
 +		write_threads_num++;
 +	} /* for (i) */
 +} /* }}} void start_write_threads */
 +
 +static void stop_write_threads (void) /* {{{ */
 +{
 +	write_queue_t *q;
 +	int i;
 +
 +	if (write_threads == NULL)
 +		return;
 +
 +	INFO ("collectd: Stopping %zu write threads.", write_threads_num);
 +
 +	pthread_mutex_lock (&write_lock);
 +	write_loop = 0;
 +	DEBUG ("plugin: stop_write_threads: Signalling `write_cond'");
 +	pthread_cond_broadcast (&write_cond);
 +	pthread_mutex_unlock (&write_lock);
 +
 +	for (i = 0; i < write_threads_num; i++)
 +	{
 +		if (pthread_join (write_threads[i], NULL) != 0)
 +		{
 +			ERROR ("plugin: stop_write_threads: pthread_join failed.");
 +		}
 +		write_threads[i] = (pthread_t) 0;
 +	}
 +	sfree (write_threads);
 +	write_threads_num = 0;
 +
 +	pthread_mutex_lock (&write_lock);
 +	i = 0;
 +	for (q = write_queue_head; q != NULL; )
 +	{
 +		write_queue_t *q1 = q;
 +		plugin_value_list_free (q->vl);
 +		q = q->next;
 +		sfree (q1);
 +		i++;
 +	}
 +	write_queue_head = NULL;
 +	write_queue_tail = NULL;
 +	write_queue_length = 0;
 +	pthread_mutex_unlock (&write_lock);
 +
 +	if (i > 0)
 +	{
 +		WARNING ("plugin: %i value list%s left after shutting down "
 +				"the write threads.",
 +				i, (i == 1) ? " was" : "s were");
 +	}
 +} /* }}} void stop_write_threads */
 +
 +/*
 + * Public functions
 + */
 +void plugin_set_dir (const char *dir)
 +{
 +	if (plugindir != NULL)
 +		free (plugindir);
 +
 +	if (dir == NULL)
 +		plugindir = NULL;
 +	else if ((plugindir = strdup (dir)) == NULL)
 +	{
 +		char errbuf[1024];
 +		ERROR ("strdup failed: %s",
 +				sstrerror (errno, errbuf, sizeof (errbuf)));
 +	}
 +}
 +
 +static _Bool plugin_is_loaded (char const *name)
 +{
 +	int status;
 +
 +	if (plugins_loaded == NULL)
 +		plugins_loaded = c_avl_create ((void *) strcasecmp);
 +	assert (plugins_loaded != NULL);
 +
 +	status = c_avl_get (plugins_loaded, name, /* ret_value = */ NULL);
 +	return (status == 0);
 +}
 +
 +static int plugin_mark_loaded (char const *name)
 +{
 +	char *name_copy;
 +	int status;
 +
 +	name_copy = strdup (name);
 +	if (name_copy == NULL)
 +		return (ENOMEM);
 +
 +	status = c_avl_insert (plugins_loaded,
 +			/* key = */ name_copy, /* value = */ NULL);
 +	return (status);
 +}
 +
 +static void plugin_free_loaded ()
 +{
 +	void *key;
 +	void *value;
 +
 +	if (plugins_loaded == NULL)
 +		return;
 +
 +	while (c_avl_pick (plugins_loaded, &key, &value) == 0)
 +	{
 +		sfree (key);
 +		assert (value == NULL);
 +	}
 +
 +	c_avl_destroy (plugins_loaded);
 +	plugins_loaded = NULL;
 +}
 +
 +#define BUFSIZE 512
 +int plugin_load (char const *plugin_name, uint32_t flags)
 +{
 +	DIR  *dh;
 +	const char *dir;
 +	char  filename[BUFSIZE] = "";
 +	char  typename[BUFSIZE];
 +	int   typename_len;
 +	int   ret;
 +	struct stat    statbuf;
 +	struct dirent *de;
 +	int status;
 +
 +	if (plugin_name == NULL)
 +		return (EINVAL);
 +
 +	/* Check if plugin is already loaded and don't do anything in this
 +	 * case. */
 +	if (plugin_is_loaded (plugin_name))
 +		return (0);
 +
 +	dir = plugin_get_dir ();
 +	ret = 1;
 +
 +	/*
 +	 * XXX: Magic at work:
 +	 *
 +	 * Some of the language bindings, for example the Python and Perl
 +	 * plugins, need to be able to export symbols to the scripts they run.
 +	 * For this to happen, the "Globals" flag needs to be set.
 +	 * Unfortunately, this technical detail is hard to explain to the
 +	 * average user and she shouldn't have to worry about this, ideally.
 +	 * So in order to save everyone's sanity use a different default for a
 +	 * handful of special plugins. --octo
 +	 */
 +	if ((strcasecmp ("perl", plugin_name) == 0)
 +			|| (strcasecmp ("python", plugin_name) == 0))
 +		flags |= PLUGIN_FLAGS_GLOBAL;
 +
 +	/* `cpu' should not match `cpufreq'. To solve this we add `.so' to the
 +	 * type when matching the filename */
 +	status = ssnprintf (typename, sizeof (typename), "%s.so", plugin_name);
 +	if ((status < 0) || ((size_t) status >= sizeof (typename)))
 +	{
 +		WARNING ("plugin_load: Filename too long: \"%s.so\"", plugin_name);
 +		return (-1);
 +	}
 +	typename_len = strlen (typename);
 +
 +	if ((dh = opendir (dir)) == NULL)
 +	{
 +		char errbuf[1024];
 +		ERROR ("plugin_load: opendir (%s) failed: %s", dir,
 +				sstrerror (errno, errbuf, sizeof (errbuf)));
 +		return (-1);
 +	}
 +
 +	while ((de = readdir (dh)) != NULL)
 +	{
 +		if (strncasecmp (de->d_name, typename, typename_len))
 +			continue;
 +
 +		status = ssnprintf (filename, sizeof (filename),
 +				"%s/%s", dir, de->d_name);
 +		if ((status < 0) || ((size_t) status >= sizeof (filename)))
 +		{
 +			WARNING ("plugin_load: Filename too long: \"%s/%s\"",
 +					dir, de->d_name);
 +			continue;
 +		}
 +
 +		if (lstat (filename, &statbuf) == -1)
 +		{
 +			char errbuf[1024];
 +			WARNING ("plugin_load: stat (\"%s\") failed: %s",
 +					filename,
 +					sstrerror (errno, errbuf, sizeof (errbuf)));
 +			continue;
 +		}
 +		else if (!S_ISREG (statbuf.st_mode))
 +		{
 +			/* don't follow symlinks */
 +			WARNING ("plugin_load: %s is not a regular file.",
 +				       	filename);
 +			continue;
 +		}
 +
 +		status = plugin_load_file (filename, flags);
 +		if (status == 0)
 +		{
 +			/* success */
 +			plugin_mark_loaded (plugin_name);
 +			ret = 0;
 +			break;
 +		}
 +		else
 +		{
 +			ERROR ("plugin_load: Load plugin \"%s\" failed with "
 +					"status %i.", plugin_name, status);
 +		}
 +	}
 +
 +	closedir (dh);
 +
 +	if (filename[0] == 0)
 +		ERROR ("plugin_load: Could not find plugin \"%s\" in %s",
 +				plugin_name, dir);
 +
 +	return (ret);
 +}
 +
 +/*
 + * The `register_*' functions follow
 + */
 +int plugin_register_config (const char *name,
 +		int (*callback) (const char *key, const char *val),
 +		const char **keys, int keys_num)
 +{
 +	cf_register (name, callback, keys, keys_num);
 +	return (0);
 +} /* int plugin_register_config */
 +
 +int plugin_register_complex_config (const char *type,
 +		int (*callback) (oconfig_item_t *))
 +{
 +	return (cf_register_complex (type, callback));
 +} /* int plugin_register_complex_config */
 +
 +int plugin_register_init (const char *name,
 +		int (*callback) (void))
 +{
 +	return (create_register_callback (&list_init, name, (void *) callback,
 +				/* user_data = */ NULL));
 +} /* plugin_register_init */
 +
 +static int plugin_compare_read_func (const void *arg0, const void *arg1)
 +{
 +	const read_func_t *rf0;
 +	const read_func_t *rf1;
 +
 +	rf0 = arg0;
 +	rf1 = arg1;
 +
 +	if (rf0->rf_next_read < rf1->rf_next_read)
 +		return (-1);
 +	else if (rf0->rf_next_read > rf1->rf_next_read)
 +		return (1);
 +	else
 +		return (0);
 +} /* int plugin_compare_read_func */
 +
 +/* Add a read function to both, the heap and a linked list. The linked list if
 + * used to look-up read functions, especially for the remove function. The heap
 + * is used to determine which plugin to read next. */
 +static int plugin_insert_read (read_func_t *rf)
 +{
 +	int status;
 +	llentry_t *le;
 +
 +	rf->rf_next_read = cdtime ();
 +	rf->rf_effective_interval = rf->rf_interval;
 +
 +	pthread_mutex_lock (&read_lock);
 +
 +	if (read_list == NULL)
 +	{
 +		read_list = llist_create ();
 +		if (read_list == NULL)
 +		{
 +			pthread_mutex_unlock (&read_lock);
 +			ERROR ("plugin_insert_read: read_list failed.");
 +			return (-1);
 +		}
 +	}
 +
 +	if (read_heap == NULL)
 +	{
 +		read_heap = c_heap_create (plugin_compare_read_func);
 +		if (read_heap == NULL)
 +		{
 +			pthread_mutex_unlock (&read_lock);
 +			ERROR ("plugin_insert_read: c_heap_create failed.");
 +			return (-1);
 +		}
 +	}
 +
 +	le = llist_search (read_list, rf->rf_name);
 +	if (le != NULL)
 +	{
 +		pthread_mutex_unlock (&read_lock);
 +		WARNING ("The read function \"%s\" is already registered. "
 +				"Check for duplicate \"LoadPlugin\" lines "
 +				"in your configuration!",
 +				rf->rf_name);
 +		return (EINVAL);
 +	}
 +
 +	le = llentry_create (rf->rf_name, rf);
 +	if (le == NULL)
 +	{
 +		pthread_mutex_unlock (&read_lock);
 +		ERROR ("plugin_insert_read: llentry_create failed.");
 +		return (-1);
 +	}
 +
 +	status = c_heap_insert (read_heap, rf);
 +	if (status != 0)
 +	{
 +		pthread_mutex_unlock (&read_lock);
 +		ERROR ("plugin_insert_read: c_heap_insert failed.");
 +		llentry_destroy (le);
 +		return (-1);
 +	}
 +
 +	/* This does not fail. */
 +	llist_append (read_list, le);
 +
 +	/* Wake up all the read threads. */
 +	pthread_cond_broadcast (&read_cond);
 +	pthread_mutex_unlock (&read_lock);
 +	return (0);
 +} /* int plugin_insert_read */
 +
 +int plugin_register_read (const char *name,
 +		int (*callback) (void))
 +{
 +	read_func_t *rf;
 +	int status;
 +
 +	rf = malloc (sizeof (*rf));
 +	if (rf == NULL)
 +	{
 +		ERROR ("plugin_register_read: malloc failed.");
 +		return (ENOMEM);
 +	}
 +
 +	memset (rf, 0, sizeof (read_func_t));
 +	rf->rf_callback = (void *) callback;
 +	rf->rf_udata.data = NULL;
 +	rf->rf_udata.free_func = NULL;
 +	rf->rf_ctx = plugin_get_ctx ();
 +	rf->rf_group[0] = '\0';
 +	rf->rf_name = strdup (name);
 +	rf->rf_type = RF_SIMPLE;
 +	rf->rf_interval = plugin_get_interval ();
 +
 +	status = plugin_insert_read (rf);
 +	if (status != 0)
 +		sfree (rf);
 +
 +	return (status);
 +} /* int plugin_register_read */
 +
 +int plugin_register_complex_read (const char *group, const char *name,
 +		plugin_read_cb callback,
 +		const struct timespec *interval,
 +		user_data_t *user_data)
 +{
 +	read_func_t *rf;
 +	int status;
 +
 +	rf = malloc (sizeof (*rf));
 +	if (rf == NULL)
 +	{
 +		ERROR ("plugin_register_complex_read: malloc failed.");
 +		return (ENOMEM);
 +	}
 +
 +	memset (rf, 0, sizeof (read_func_t));
 +	rf->rf_callback = (void *) callback;
 +	if (group != NULL)
 +		sstrncpy (rf->rf_group, group, sizeof (rf->rf_group));
 +	else
 +		rf->rf_group[0] = '\0';
 +	rf->rf_name = strdup (name);
 +	rf->rf_type = RF_COMPLEX;
 +	if (interval != NULL)
 +		rf->rf_interval = TIMESPEC_TO_CDTIME_T (interval);
 +	else
 +		rf->rf_interval = plugin_get_interval ();
 +
 +	/* Set user data */
 +	if (user_data == NULL)
 +	{
 +		rf->rf_udata.data = NULL;
 +		rf->rf_udata.free_func = NULL;
 +	}
 +	else
 +	{
 +		rf->rf_udata = *user_data;
 +	}
 +
 +	rf->rf_ctx = plugin_get_ctx ();
 +
 +	status = plugin_insert_read (rf);
 +	if (status != 0)
 +		sfree (rf);
 +
 +	return (status);
 +} /* int plugin_register_complex_read */
 +
 +int plugin_register_write (const char *name,
 +		plugin_write_cb callback, user_data_t *ud)
 +{
 +	return (create_register_callback (&list_write, name,
 +				(void *) callback, ud));
 +} /* int plugin_register_write */
 +
 +int plugin_register_flush (const char *name,
 +		plugin_flush_cb callback, user_data_t *ud)
 +{
 +	return (create_register_callback (&list_flush, name,
 +				(void *) callback, ud));
 +} /* int plugin_register_flush */
 +
 +int plugin_register_missing (const char *name,
 +		plugin_missing_cb callback, user_data_t *ud)
 +{
 +	return (create_register_callback (&list_missing, name,
 +				(void *) callback, ud));
 +} /* int plugin_register_missing */
 +
 +int plugin_register_shutdown (const char *name,
 +		int (*callback) (void))
 +{
 +	return (create_register_callback (&list_shutdown, name,
 +				(void *) callback, /* user_data = */ NULL));
 +} /* int plugin_register_shutdown */
 +
 +static void plugin_free_data_sets (void)
 +{
 +	void *key;
 +	void *value;
 +
 +	if (data_sets == NULL)
 +		return;
 +
 +	while (c_avl_pick (data_sets, &key, &value) == 0)
 +	{
 +		data_set_t *ds = value;
 +		/* key is a pointer to ds->type */
 +
 +		sfree (ds->ds);
 +		sfree (ds);
 +	}
 +
 +	c_avl_destroy (data_sets);
 +	data_sets = NULL;
 +} /* void plugin_free_data_sets */
 +
 +int plugin_register_data_set (const data_set_t *ds)
 +{
 +	data_set_t *ds_copy;
 +	int i;
 +
 +	if ((data_sets != NULL)
 +			&& (c_avl_get (data_sets, ds->type, NULL) == 0))
 +	{
 +		NOTICE ("Replacing DS `%s' with another version.", ds->type);
 +		plugin_unregister_data_set (ds->type);
 +	}
 +	else if (data_sets == NULL)
 +	{
 +		data_sets = c_avl_create ((int (*) (const void *, const void *)) strcmp);
 +		if (data_sets == NULL)
 +			return (-1);
 +	}
 +
 +	ds_copy = (data_set_t *) malloc (sizeof (data_set_t));
 +	if (ds_copy == NULL)
 +		return (-1);
 +	memcpy(ds_copy, ds, sizeof (data_set_t));
 +
 +	ds_copy->ds = (data_source_t *) malloc (sizeof (data_source_t)
 +			* ds->ds_num);
 +	if (ds_copy->ds == NULL)
 +	{
 +		free (ds_copy);
 +		return (-1);
 +	}
 +
 +	for (i = 0; i < ds->ds_num; i++)
 +		memcpy (ds_copy->ds + i, ds->ds + i, sizeof (data_source_t));
 +
 +	return (c_avl_insert (data_sets, (void *) ds_copy->type, (void *) ds_copy));
 +} /* int plugin_register_data_set */
 +
 +int plugin_register_log (const char *name,
 +		plugin_log_cb callback, user_data_t *ud)
 +{
 +	return (create_register_callback (&list_log, name,
 +				(void *) callback, ud));
 +} /* int plugin_register_log */
 +
 +int plugin_register_notification (const char *name,
 +		plugin_notification_cb callback, user_data_t *ud)
 +{
 +	return (create_register_callback (&list_notification, name,
 +				(void *) callback, ud));
 +} /* int plugin_register_log */
 +
 +int plugin_unregister_config (const char *name)
 +{
 +	cf_unregister (name);
 +	return (0);
 +} /* int plugin_unregister_config */
 +
 +int plugin_unregister_complex_config (const char *name)
 +{
 +	cf_unregister_complex (name);
 +	return (0);
 +} /* int plugin_unregister_complex_config */
 +
 +int plugin_unregister_init (const char *name)
 +{
 +	return (plugin_unregister (list_init, name));
 +}
 +
 +int plugin_unregister_read (const char *name) /* {{{ */
 +{
 +	llentry_t *le;
 +	read_func_t *rf;
 +
 +	if (name == NULL)
 +		return (-ENOENT);
 +
 +	pthread_mutex_lock (&read_lock);
 +
 +	if (read_list == NULL)
 +	{
 +		pthread_mutex_unlock (&read_lock);
 +		return (-ENOENT);
 +	}
 +
 +	le = llist_search (read_list, name);
 +	if (le == NULL)
 +	{
 +		pthread_mutex_unlock (&read_lock);
 +		WARNING ("plugin_unregister_read: No such read function: %s",
 +				name);
 +		return (-ENOENT);
 +	}
 +
 +	llist_remove (read_list, le);
 +
 +	rf = le->value;
 +	assert (rf != NULL);
 +	rf->rf_type = RF_REMOVE;
 +
 +	pthread_mutex_unlock (&read_lock);
 +
 +	llentry_destroy (le);
 +
 +	DEBUG ("plugin_unregister_read: Marked `%s' for removal.", name);
 +
 +	return (0);
 +} /* }}} int plugin_unregister_read */
 +
 +static int compare_read_func_group (llentry_t *e, void *ud) /* {{{ */
 +{
 +	read_func_t *rf    = e->value;
 +	char        *group = ud;
 +
 +	return strcmp (rf->rf_group, (const char *)group);
 +} /* }}} int compare_read_func_group */
 +
 +int plugin_unregister_read_group (const char *group) /* {{{ */
 +{
 +	llentry_t *le;
 +	read_func_t *rf;
 +
 +	int found = 0;
 +
 +	if (group == NULL)
 +		return (-ENOENT);
 +
 +	pthread_mutex_lock (&read_lock);
 +
 +	if (read_list == NULL)
 +	{
 +		pthread_mutex_unlock (&read_lock);
 +		return (-ENOENT);
 +	}
 +
 +	while (42)
 +	{
 +		le = llist_search_custom (read_list,
 +				compare_read_func_group, (void *)group);
 +
 +		if (le == NULL)
 +			break;
 +
 +		++found;
 +
 +		llist_remove (read_list, le);
 +
 +		rf = le->value;
 +		assert (rf != NULL);
 +		rf->rf_type = RF_REMOVE;
 +
 +		llentry_destroy (le);
 +
 +		DEBUG ("plugin_unregister_read_group: "
 +				"Marked `%s' (group `%s') for removal.",
 +				rf->rf_name, group);
 +	}
 +
 +	pthread_mutex_unlock (&read_lock);
 +
 +	if (found == 0)
 +	{
 +		WARNING ("plugin_unregister_read_group: No such "
 +				"group of read function: %s", group);
 +		return (-ENOENT);
 +	}
 +
 +	return (0);
 +} /* }}} int plugin_unregister_read_group */
 +
 +int plugin_unregister_write (const char *name)
 +{
 +	return (plugin_unregister (list_write, name));
 +}
 +
 +int plugin_unregister_flush (const char *name)
 +{
 +	return (plugin_unregister (list_flush, name));
 +}
 +
 +int plugin_unregister_missing (const char *name)
 +{
 +	return (plugin_unregister (list_missing, name));
 +}
 +
 +int plugin_unregister_shutdown (const char *name)
 +{
 +	return (plugin_unregister (list_shutdown, name));
 +}
 +
 +int plugin_unregister_data_set (const char *name)
 +{
 +	data_set_t *ds;
 +
 +	if (data_sets == NULL)
 +		return (-1);
 +
 +	if (c_avl_remove (data_sets, name, NULL, (void *) &ds) != 0)
 +		return (-1);
 +
 +	sfree (ds->ds);
 +	sfree (ds);
 +
 +	return (0);
 +} /* int plugin_unregister_data_set */
 +
 +int plugin_unregister_log (const char *name)
 +{
 +	return (plugin_unregister (list_log, name));
 +}
 +
 +int plugin_unregister_notification (const char *name)
 +{
 +	return (plugin_unregister (list_notification, name));
 +}
 +
 +void plugin_init_all (void)
 +{
 +	char const *chain_name;
 +	long write_threads_num;
 +	llentry_t *le;
 +	int status;
 +
 +	/* Init the value cache */
 +	uc_init ();
 +
 +	if (IS_TRUE (global_option_get ("CollectInternalStats")))
 +		record_statistics = 1;
 +
 +	chain_name = global_option_get ("PreCacheChain");
 +	pre_cache_chain = fc_chain_get_by_name (chain_name);
 +
 +	chain_name = global_option_get ("PostCacheChain");
 +	post_cache_chain = fc_chain_get_by_name (chain_name);
 +
 +	write_limit_high = global_option_get_long ("WriteQueueLimitHigh",
 +			/* default = */ 0);
 +	if (write_limit_high < 0)
 +	{
 +		ERROR ("WriteQueueLimitHigh must be positive or zero.");
 +		write_limit_high = 0;
 +	}
 +
 +	write_limit_low = global_option_get_long ("WriteQueueLimitLow",
 +			/* default = */ write_limit_high / 2);
 +	if (write_limit_low < 0)
 +	{
 +		ERROR ("WriteQueueLimitLow must be positive or zero.");
 +		write_limit_low = write_limit_high / 2;
 +	}
 +	else if (write_limit_low > write_limit_high)
 +	{
 +		ERROR ("WriteQueueLimitLow must not be larger than "
 +				"WriteQueueLimitHigh.");
 +		write_limit_low = write_limit_high;
 +	}
 +
 +	write_threads_num = global_option_get_long ("WriteThreads",
 +			/* default = */ 5);
 +	if (write_threads_num < 1)
 +	{
 +		ERROR ("WriteThreads must be positive.");
 +		write_threads_num = 5;
 +	}
 +
 +	start_write_threads ((size_t) write_threads_num);
 +
 +	if ((list_init == NULL) && (read_heap == NULL))
 +		return;
 +
 +	/* Calling all init callbacks before checking if read callbacks
 +	 * are available allows the init callbacks to register the read
 +	 * callback. */
 +	le = llist_head (list_init);
 +	while (le != NULL)
 +	{
 +		callback_func_t *cf;
 +		plugin_init_cb callback;
 +		plugin_ctx_t old_ctx;
 +
 +		cf = le->value;
 +		old_ctx = plugin_set_ctx (cf->cf_ctx);
 +		callback = cf->cf_callback;
 +		status = (*callback) ();
 +		plugin_set_ctx (old_ctx);
 +
 +		if (status != 0)
 +		{
 +			ERROR ("Initialization of plugin `%s' "
 +					"failed with status %i. "
 +					"Plugin will be unloaded.",
 +					le->key, status);
 +			/* Plugins that register read callbacks from the init
 +			 * callback should take care of appropriate error
 +			 * handling themselves. */
 +			/* FIXME: Unload _all_ functions */
 +			plugin_unregister_read (le->key);
 +		}
 +
 +		le = le->next;
 +	}
 +
 +	max_read_interval = global_option_get_time ("MaxReadInterval",
 +			DEFAULT_MAX_READ_INTERVAL);
 +
 +	/* Start read-threads */
 +	if (read_heap != NULL)
 +	{
 +		const char *rt;
 +		int num;
 +
 +		rt = global_option_get ("ReadThreads");
 +		num = atoi (rt);
 +		if (num != -1)
 +			start_read_threads ((num > 0) ? num : 5);
 +	}
 +} /* void plugin_init_all */
 +
 +/* TODO: Rename this function. */
 +void plugin_read_all (void)
 +{
 +	if(record_statistics) {
 +		plugin_update_internal_statistics ();
 +	}
 +	uc_check_timeout ();
 +
 +	return;
 +} /* void plugin_read_all */
 +
 +/* Read function called when the `-T' command line argument is given. */
 +int plugin_read_all_once (void)
 +{
 +	int status;
 +	int return_status = 0;
 +
 +	if (read_heap == NULL)
 +	{
 +		NOTICE ("No read-functions are registered.");
 +		return (0);
 +	}
 +
 +	while (42)
 +	{
 +		read_func_t *rf;
 +		plugin_ctx_t old_ctx;
 +
 +		rf = c_heap_get_root (read_heap);
 +		if (rf == NULL)
 +			break;
 +
 +		old_ctx = plugin_set_ctx (rf->rf_ctx);
 +
 +		if (rf->rf_type == RF_SIMPLE)
 +		{
 +			int (*callback) (void);
 +
 +			callback = rf->rf_callback;
 +			status = (*callback) ();
 +		}
 +		else
 +		{
 +			plugin_read_cb callback;
 +
 +			callback = rf->rf_callback;
 +			status = (*callback) (&rf->rf_udata);
 +		}
 +
 +		plugin_set_ctx (old_ctx);
 +
 +		if (status != 0)
 +		{
 +			NOTICE ("read-function of plugin `%s' failed.",
 +					rf->rf_name);
 +			return_status = -1;
 +		}
 +
 +		destroy_callback ((void *) rf);
 +	}
 +
 +	return (return_status);
 +} /* int plugin_read_all_once */
 +
 +int plugin_write (const char *plugin, /* {{{ */
 +		const data_set_t *ds, const value_list_t *vl)
 +{
 +  llentry_t *le;
 +  int status;
 +
 +  if (vl == NULL)
 +    return (EINVAL);
 +
 +  if (list_write == NULL)
 +    return (ENOENT);
 +
 +  if (ds == NULL)
 +  {
 +    ds = plugin_get_ds (vl->type);
 +    if (ds == NULL)
 +    {
 +      ERROR ("plugin_write: Unable to lookup type `%s'.", vl->type);
 +      return (ENOENT);
 +    }
 +  }
 +
 +  if (plugin == NULL)
 +  {
 +    int success = 0;
 +    int failure = 0;
 +
 +    le = llist_head (list_write);
 +    while (le != NULL)
 +    {
 +      callback_func_t *cf = le->value;
 +      plugin_write_cb callback;
 +
 +      /* do not switch plugin context; rather keep the context (interval)
 +       * information of the calling read plugin */
 +
 +      DEBUG ("plugin: plugin_write: Writing values via %s.", le->key);
 +      callback = cf->cf_callback;
 +      status = (*callback) (ds, vl, &cf->cf_udata);
 +      if (status != 0)
 +        failure++;
 +      else
 +        success++;
 +
 +      le = le->next;
 +    }
 +
 +    if ((success == 0) && (failure != 0))
 +      status = -1;
 +    else
 +      status = 0;
 +  }
 +  else /* plugin != NULL */
 +  {
 +    callback_func_t *cf;
 +    plugin_write_cb callback;
 +
 +    le = llist_head (list_write);
 +    while (le != NULL)
 +    {
 +      if (strcasecmp (plugin, le->key) == 0)
 +        break;
 +
 +      le = le->next;
 +    }
 +
 +    if (le == NULL)
 +      return (ENOENT);
 +
 +    cf = le->value;
 +
 +    /* do not switch plugin context; rather keep the context (interval)
 +     * information of the calling read plugin */
 +
 +    DEBUG ("plugin: plugin_write: Writing values via %s.", le->key);
 +    callback = cf->cf_callback;
 +    status = (*callback) (ds, vl, &cf->cf_udata);
 +  }
 +
 +  return (status);
 +} /* }}} int plugin_write */
 +
 +int plugin_flush (const char *plugin, cdtime_t timeout, const char *identifier)
 +{
 +  llentry_t *le;
 +
 +  if (list_flush == NULL)
 +    return (0);
 +
 +  le = llist_head (list_flush);
 +  while (le != NULL)
 +  {
 +    callback_func_t *cf;
 +    plugin_flush_cb callback;
 +    plugin_ctx_t old_ctx;
 +
 +    if ((plugin != NULL)
 +        && (strcmp (plugin, le->key) != 0))
 +    {
 +      le = le->next;
 +      continue;
 +    }
 +
 +    cf = le->value;
 +    old_ctx = plugin_set_ctx (cf->cf_ctx);
 +    callback = cf->cf_callback;
 +
 +    (*callback) (timeout, identifier, &cf->cf_udata);
 +
 +    plugin_set_ctx (old_ctx);
 +
 +    le = le->next;
 +  }
 +  return (0);
 +} /* int plugin_flush */
 +
 +void plugin_shutdown_all (void)
 +{
 +	llentry_t *le;
 +
 +	stop_read_threads ();
 +
 +	destroy_all_callbacks (&list_init);
 +
 +	pthread_mutex_lock (&read_lock);
 +	llist_destroy (read_list);
 +	read_list = NULL;
 +	pthread_mutex_unlock (&read_lock);
 +
 +	destroy_read_heap ();
 +
 +	plugin_flush (/* plugin = */ NULL,
 +			/* timeout = */ 0,
 +			/* identifier = */ NULL);
 +
 +	le = NULL;
 +	if (list_shutdown != NULL)
 +		le = llist_head (list_shutdown);
 +
 +	while (le != NULL)
 +	{
 +		callback_func_t *cf;
 +		plugin_shutdown_cb callback;
 +		plugin_ctx_t old_ctx;
 +
 +		cf = le->value;
 +		old_ctx = plugin_set_ctx (cf->cf_ctx);
 +		callback = cf->cf_callback;
 +
 +		/* Advance the pointer before calling the callback allows
 +		 * shutdown functions to unregister themselves. If done the
 +		 * other way around the memory `le' points to will be freed
 +		 * after callback returns. */
 +		le = le->next;
 +
 +		(*callback) ();
 +
 +		plugin_set_ctx (old_ctx);
 +	}
 +
 +	stop_write_threads ();
 +
 +	/* Write plugins which use the `user_data' pointer usually need the
 +	 * same data available to the flush callback. If this is the case, set
 +	 * the free_function to NULL when registering the flush callback and to
 +	 * the real free function when registering the write callback. This way
 +	 * the data isn't freed twice. */
 +	destroy_all_callbacks (&list_flush);
 +	destroy_all_callbacks (&list_missing);
 +	destroy_all_callbacks (&list_write);
 +
 +	destroy_all_callbacks (&list_notification);
 +	destroy_all_callbacks (&list_shutdown);
 +	destroy_all_callbacks (&list_log);
 +
 +	plugin_free_loaded ();
 +	plugin_free_data_sets ();
 +} /* void plugin_shutdown_all */
 +
 +int plugin_dispatch_missing (const value_list_t *vl) /* {{{ */
 +{
 +  llentry_t *le;
 +
 +  if (list_missing == NULL)
 +    return (0);
 +
 +  le = llist_head (list_missing);
 +  while (le != NULL)
 +  {
 +    callback_func_t *cf;
 +    plugin_missing_cb callback;
 +    plugin_ctx_t old_ctx;
 +    int status;
 +
 +    cf = le->value;
 +    old_ctx = plugin_set_ctx (cf->cf_ctx);
 +    callback = cf->cf_callback;
 +
 +    status = (*callback) (vl, &cf->cf_udata);
 +    plugin_set_ctx (old_ctx);
 +    if (status != 0)
 +    {
 +      if (status < 0)
 +      {
 +        ERROR ("plugin_dispatch_missing: Callback function \"%s\" "
 +            "failed with status %i.",
 +            le->key, status);
 +        return (status);
 +      }
 +      else
 +      {
 +        return (0);
 +      }
 +    }
 +
 +    le = le->next;
 +  }
 +  return (0);
 +} /* int }}} plugin_dispatch_missing */
 +
 +static int plugin_dispatch_values_internal (value_list_t *vl)
 +{
 +	int status;
 +	static c_complain_t no_write_complaint = C_COMPLAIN_INIT_STATIC;
 +
 +	value_t *saved_values;
 +	int      saved_values_len;
 +
 +	data_set_t *ds;
 +
 +	int free_meta_data = 0;
 +
 +	if ((vl == NULL) || (vl->type[0] == 0)
 +			|| (vl->values == NULL) || (vl->values_len < 1))
 +	{
 +		ERROR ("plugin_dispatch_values: Invalid value list "
 +				"from plugin %s.", vl->plugin);
 +		return (-1);
 +	}
 +
 +	/* Free meta data only if the calling function didn't specify any. In
 +	 * this case matches and targets may add some and the calling function
 +	 * may not expect (and therefore free) that data. */
 +	if (vl->meta == NULL)
 +		free_meta_data = 1;
 +
 +	if (list_write == NULL)
 +		c_complain_once (LOG_WARNING, &no_write_complaint,
 +				"plugin_dispatch_values: No write callback has been "
 +				"registered. Please load at least one output plugin, "
 +				"if you want the collected data to be stored.");
 +
 +	if (data_sets == NULL)
 +	{
 +		ERROR ("plugin_dispatch_values: No data sets registered. "
 +				"Could the types database be read? Check "
 +				"your `TypesDB' setting!");
 +		return (-1);
 +	}
 +
 +	if (c_avl_get (data_sets, vl->type, (void *) &ds) != 0)
 +	{
 +		char ident[6 * DATA_MAX_NAME_LEN];
 +
 +		FORMAT_VL (ident, sizeof (ident), vl);
 +		INFO ("plugin_dispatch_values: Dataset not found: %s "
 +				"(from \"%s\"), check your types.db!",
 +				vl->type, ident);
 +		return (-1);
 +	}
 +
 +	/* Assured by plugin_value_list_clone(). The time is determined at
 +	 * _enqueue_ time. */
 +	assert (vl->time != 0);
 +	assert (vl->interval != 0);
 +
 +	DEBUG ("plugin_dispatch_values: time = %.3f; interval = %.3f; "
 +			"host = %s; "
 +			"plugin = %s; plugin_instance = %s; "
 +			"type = %s; type_instance = %s;",
 +			CDTIME_T_TO_DOUBLE (vl->time),
 +			CDTIME_T_TO_DOUBLE (vl->interval),
 +			vl->host,
 +			vl->plugin, vl->plugin_instance,
 +			vl->type, vl->type_instance);
 +
 +#if COLLECT_DEBUG
 +	assert (0 == strcmp (ds->type, vl->type));
 +#else
 +	if (0 != strcmp (ds->type, vl->type))
 +		WARNING ("plugin_dispatch_values: (ds->type = %s) != (vl->type = %s)",
 +				ds->type, vl->type);
 +#endif
 +
 +#if COLLECT_DEBUG
 +	assert (ds->ds_num == vl->values_len);
 +#else
 +	if (ds->ds_num != vl->values_len)
 +	{
 +		ERROR ("plugin_dispatch_values: ds->type = %s: "
 +				"(ds->ds_num = %i) != "
 +				"(vl->values_len = %i)",
 +				ds->type, ds->ds_num, vl->values_len);
 +		return (-1);
 +	}
 +#endif
 +
 +	escape_slashes (vl->host, sizeof (vl->host));
 +	escape_slashes (vl->plugin, sizeof (vl->plugin));
 +	escape_slashes (vl->plugin_instance, sizeof (vl->plugin_instance));
 +	escape_slashes (vl->type, sizeof (vl->type));
 +	escape_slashes (vl->type_instance, sizeof (vl->type_instance));
 +
 +	/* Copy the values. This way, we can assure `targets' that they get
 +	 * dynamically allocated values, which they can free and replace if
 +	 * they like. */
 +	if ((pre_cache_chain != NULL) || (post_cache_chain != NULL))
 +	{
 +		saved_values     = vl->values;
 +		saved_values_len = vl->values_len;
 +
 +		vl->values = (value_t *) calloc (vl->values_len,
 +				sizeof (*vl->values));
 +		if (vl->values == NULL)
 +		{
 +			ERROR ("plugin_dispatch_values: calloc failed.");
 +			vl->values = saved_values;
 +			return (-1);
 +		}
 +		memcpy (vl->values, saved_values,
 +				vl->values_len * sizeof (*vl->values));
 +	}
 +	else /* if ((pre == NULL) && (post == NULL)) */
 +	{
 +		saved_values     = NULL;
 +		saved_values_len = 0;
 +	}
 +
 +	if (pre_cache_chain != NULL)
 +	{
 +		status = fc_process_chain (ds, vl, pre_cache_chain);
 +		if (status < 0)
 +		{
 +			WARNING ("plugin_dispatch_values: Running the "
 +					"pre-cache chain failed with "
 +					"status %i (%#x).",
 +					status, status);
 +		}
 +		else if (status == FC_TARGET_STOP)
 +		{
 +			/* Restore the state of the value_list so that plugins
 +			 * don't get confused.. */
 +			if (saved_values != NULL)
 +			{
 +				free (vl->values);
 +				vl->values     = saved_values;
 +				vl->values_len = saved_values_len;
 +			}
 +			return (0);
 +		}
 +	}
 +
 +	/* Update the value cache */
 +	uc_update (ds, vl);
 +
 +	if (post_cache_chain != NULL)
 +	{
 +		status = fc_process_chain (ds, vl, post_cache_chain);
 +		if (status < 0)
 +		{
 +			WARNING ("plugin_dispatch_values: Running the "
 +					"post-cache chain failed with "
 +					"status %i (%#x).",
 +					status, status);
 +		}
 +	}
 +	else
 +		fc_default_action (ds, vl);
 +
 +	/* Restore the state of the value_list so that plugins don't get
 +	 * confused.. */
 +	if (saved_values != NULL)
 +	{
 +		free (vl->values);
 +		vl->values     = saved_values;
 +		vl->values_len = saved_values_len;
 +	}
 +
 +	if ((free_meta_data != 0) && (vl->meta != NULL))
 +	{
 +		meta_data_destroy (vl->meta);
 +		vl->meta = NULL;
 +	}
 +
 +	return (0);
 +} /* int plugin_dispatch_values_internal */
 +
 +static double get_drop_probability (void) /* {{{ */
 +{
 +	long pos;
 +	long size;
 +	long wql;
 +
 +	pthread_mutex_lock (&write_lock);
 +	wql = write_queue_length;
 +	pthread_mutex_unlock (&write_lock);
 +
 +	if (wql < write_limit_low)
 +		return (0.0);
 +	if (wql >= write_limit_high)
 +		return (1.0);
 +
 +	pos = 1 + wql - write_limit_low;
 +	size = 1 + write_limit_high - write_limit_low;
 +
 +	return (((double) pos) / ((double) size));
 +} /* }}} double get_drop_probability */
 +
 +static _Bool check_drop_value (void) /* {{{ */
 +{
 +	static cdtime_t last_message_time = 0;
 +	static pthread_mutex_t last_message_lock = PTHREAD_MUTEX_INITIALIZER;
 +
 +	double p;
 +	double q;
 +	int status;
 +
 +	if (write_limit_high == 0)
 +		return (0);
 +
 +	p = get_drop_probability ();
 +	if (p == 0.0)
 +		return (0);
 +
 +	status = pthread_mutex_trylock (&last_message_lock);
 +	if (status == 0)
 +	{
 +		cdtime_t now;
 +
 +		now = cdtime ();
 +		if ((now - last_message_time) > TIME_T_TO_CDTIME_T (1))
 +		{
 +			last_message_time = now;
 +			ERROR ("plugin_dispatch_values: Low water mark "
 +					"reached. Dropping %.0f%% of metrics.",
 +					100.0 * p);
 +		}
 +		pthread_mutex_unlock (&last_message_lock);
 +	}
 +
 +	if (p == 1.0)
 +		return (1);
 +
 +	q = cdrand_d ();
 +	if (q > p)
 +		return (1);
 +	else
 +		return (0);
 +} /* }}} _Bool check_drop_value */
 +
 +int plugin_dispatch_values (value_list_t const *vl)
 +{
 +	int status;
 +	static pthread_mutex_t statistics_lock = PTHREAD_MUTEX_INITIALIZER;
 +
 +	if (check_drop_value ()) {
 +		if(record_statistics) {
 +			pthread_mutex_lock(&statistics_lock);
 +			stats_values_dropped++;
 +			pthread_mutex_unlock(&statistics_lock);
 +		}
 +		return (0);
 +	}
 +
 +	status = plugin_write_enqueue (vl);
 +	if (status != 0)
 +	{
 +		char errbuf[1024];
 +		ERROR ("plugin_dispatch_values: plugin_write_enqueue failed "
 +				"with status %i (%s).", status,
 +				sstrerror (status, errbuf, sizeof (errbuf)));
 +		return (status);
 +	}
 +
 +	return (0);
 +}
 +
 +__attribute__((sentinel))
 +int plugin_dispatch_multivalue (value_list_t const *template, /* {{{ */
 +		_Bool store_percentage, ...)
 +{
 +	value_list_t *vl;
 +	int failed = 0;
 +	gauge_t sum = 0.0;
 +	va_list ap;
 +
 +	assert (template->values_len == 1);
 +
 +	va_start (ap, store_percentage);
 +	while (42)
 +	{
 +		char const *name;
 +		gauge_t value;
 +
 +		name = va_arg (ap, char const *);
 +		if (name == NULL)
 +			break;
 +
 +		value = va_arg (ap, gauge_t);
 +		if (!isnan (value))
 +			sum += value;
 +	}
 +	va_end (ap);
 +
 +	vl = plugin_value_list_clone (template);
 +	/* plugin_value_list_clone makes sure vl->time is set to non-zero. */
 +	if (store_percentage)
 +		sstrncpy (vl->type, "percent", sizeof (vl->type));
 +
 +	va_start (ap, store_percentage);
 +	while (42)
 +	{
 +		char const *name;
 +		int status;
 +
 +		/* Set the type instance. */
 +		name = va_arg (ap, char const *);
 +		if (name == NULL)
 +			break;
 +		sstrncpy (vl->type_instance, name, sizeof (vl->type_instance));
 +
 +		/* Set the value. */
 +		vl->values[0].gauge = va_arg (ap, gauge_t);
 +		if (store_percentage)
 +			vl->values[0].gauge *= 100.0 / sum;
 +
 +		status = plugin_write_enqueue (vl);
 +		if (status != 0)
 +			failed++;
 +	}
 +	va_end (ap);
 +
 +	plugin_value_list_free (vl);
 +	return (failed);
 +} /* }}} int plugin_dispatch_multivalue */
 +
 +int plugin_dispatch_notification (const notification_t *notif)
 +{
 +	llentry_t *le;
 +	/* Possible TODO: Add flap detection here */
 +
 +	DEBUG ("plugin_dispatch_notification: severity = %i; message = %s; "
 +			"time = %.3f; host = %s;",
 +			notif->severity, notif->message,
 +			CDTIME_T_TO_DOUBLE (notif->time), notif->host);
 +
 +	/* Nobody cares for notifications */
 +	if (list_notification == NULL)
 +		return (-1);
 +
 +	le = llist_head (list_notification);
 +	while (le != NULL)
 +	{
 +		callback_func_t *cf;
 +		plugin_notification_cb callback;
 +		int status;
 +
 +		/* do not switch plugin context; rather keep the context
 +		 * (interval) information of the calling plugin */
 +
 +		cf = le->value;
 +		callback = cf->cf_callback;
 +		status = (*callback) (notif, &cf->cf_udata);
 +		if (status != 0)
 +		{
 +			WARNING ("plugin_dispatch_notification: Notification "
 +					"callback %s returned %i.",
 +					le->key, status);
 +		}
 +
 +		le = le->next;
 +	}
 +
 +	return (0);
 +} /* int plugin_dispatch_notification */
 +
 +void plugin_log (int level, const char *format, ...)
 +{
 +	char msg[1024];
 +	va_list ap;
 +	llentry_t *le;
 +
 +#if !COLLECT_DEBUG
 +	if (level >= LOG_DEBUG)
 +		return;
 +#endif
 +
 +	va_start (ap, format);
 +	vsnprintf (msg, sizeof (msg), format, ap);
 +	msg[sizeof (msg) - 1] = '\0';
 +	va_end (ap);
 +
 +	if (list_log == NULL)
 +	{
 +		fprintf (stderr, "%s\n", msg);
 +		return;
 +	}
 +
 +	le = llist_head (list_log);
 +	while (le != NULL)
 +	{
 +		callback_func_t *cf;
 +		plugin_log_cb callback;
 +
 +		cf = le->value;
 +		callback = cf->cf_callback;
 +
 +		/* do not switch plugin context; rather keep the context
 +		 * (interval) information of the calling plugin */
 +
 +		(*callback) (level, msg, &cf->cf_udata);
 +
 +		le = le->next;
 +	}
 +} /* void plugin_log */
 +
 +int parse_log_severity (const char *severity)
 +{
 +	int log_level = -1;
 +
 +	if ((0 == strcasecmp (severity, "emerg"))
 +			|| (0 == strcasecmp (severity, "alert"))
 +			|| (0 == strcasecmp (severity, "crit"))
 +			|| (0 == strcasecmp (severity, "err")))
 +		log_level = LOG_ERR;
 +	else if (0 == strcasecmp (severity, "warning"))
 +		log_level = LOG_WARNING;
 +	else if (0 == strcasecmp (severity, "notice"))
 +		log_level = LOG_NOTICE;
 +	else if (0 == strcasecmp (severity, "info"))
 +		log_level = LOG_INFO;
 +#if COLLECT_DEBUG
 +	else if (0 == strcasecmp (severity, "debug"))
 +		log_level = LOG_DEBUG;
 +#endif /* COLLECT_DEBUG */
 +
 +	return (log_level);
 +} /* int parse_log_severity */
 +
 +int parse_notif_severity (const char *severity)
 +{
 +	int notif_severity = -1;
 +
 +	if (strcasecmp (severity, "FAILURE") == 0)
 +		notif_severity = NOTIF_FAILURE;
 +	else if (strcmp (severity, "OKAY") == 0)
 +		notif_severity = NOTIF_OKAY;
 +	else if ((strcmp (severity, "WARNING") == 0)
 +			|| (strcmp (severity, "WARN") == 0))
 +		notif_severity = NOTIF_WARNING;
 +
 +	return (notif_severity);
 +} /* int parse_notif_severity */
 +
 +const data_set_t *plugin_get_ds (const char *name)
 +{
 +	data_set_t *ds;
 +
 +	if (data_sets == NULL)
 +	{
 +		ERROR ("plugin_get_ds: No data sets are defined yet.");
 +		return (NULL);
 +	}
 +
 +	if (c_avl_get (data_sets, name, (void *) &ds) != 0)
 +	{
 +		DEBUG ("No such dataset registered: %s", name);
 +		return (NULL);
 +	}
 +
 +	return (ds);
 +} /* data_set_t *plugin_get_ds */
 +
 +static int plugin_notification_meta_add (notification_t *n,
 +    const char *name,
 +    enum notification_meta_type_e type,
 +    const void *value)
 +{
 +  notification_meta_t *meta;
 +  notification_meta_t *tail;
 +
 +  if ((n == NULL) || (name == NULL) || (value == NULL))
 +  {
 +    ERROR ("plugin_notification_meta_add: A pointer is NULL!");
 +    return (-1);
 +  }
 +
 +  meta = (notification_meta_t *) malloc (sizeof (notification_meta_t));
 +  if (meta == NULL)
 +  {
 +    ERROR ("plugin_notification_meta_add: malloc failed.");
 +    return (-1);
 +  }
 +  memset (meta, 0, sizeof (notification_meta_t));
 +
 +  sstrncpy (meta->name, name, sizeof (meta->name));
 +  meta->type = type;
 +
 +  switch (type)
 +  {
 +    case NM_TYPE_STRING:
 +    {
 +      meta->nm_value.nm_string = strdup ((const char *) value);
 +      if (meta->nm_value.nm_string == NULL)
 +      {
 +        ERROR ("plugin_notification_meta_add: strdup failed.");
 +        sfree (meta);
 +        return (-1);
 +      }
 +      break;
 +    }
 +    case NM_TYPE_SIGNED_INT:
 +    {
 +      meta->nm_value.nm_signed_int = *((int64_t *) value);
 +      break;
 +    }
 +    case NM_TYPE_UNSIGNED_INT:
 +    {
 +      meta->nm_value.nm_unsigned_int = *((uint64_t *) value);
 +      break;
 +    }
 +    case NM_TYPE_DOUBLE:
 +    {
 +      meta->nm_value.nm_double = *((double *) value);
 +      break;
 +    }
 +    case NM_TYPE_BOOLEAN:
 +    {
 +      meta->nm_value.nm_boolean = *((_Bool *) value);
 +      break;
 +    }
 +    default:
 +    {
 +      ERROR ("plugin_notification_meta_add: Unknown type: %i", type);
 +      sfree (meta);
 +      return (-1);
 +    }
 +  } /* switch (type) */
 +
 +  meta->next = NULL;
 +  tail = n->meta;
 +  while ((tail != NULL) && (tail->next != NULL))
 +    tail = tail->next;
 +
 +  if (tail == NULL)
 +    n->meta = meta;
 +  else
 +    tail->next = meta;
 +
 +  return (0);
 +} /* int plugin_notification_meta_add */
 +
 +int plugin_notification_meta_add_string (notification_t *n,
 +    const char *name,
 +    const char *value)
 +{
 +  return (plugin_notification_meta_add (n, name, NM_TYPE_STRING, value));
 +}
 +
 +int plugin_notification_meta_add_signed_int (notification_t *n,
 +    const char *name,
 +    int64_t value)
 +{
 +  return (plugin_notification_meta_add (n, name, NM_TYPE_SIGNED_INT, &value));
 +}
 +
 +int plugin_notification_meta_add_unsigned_int (notification_t *n,
 +    const char *name,
 +    uint64_t value)
 +{
 +  return (plugin_notification_meta_add (n, name, NM_TYPE_UNSIGNED_INT, &value));
 +}
 +
 +int plugin_notification_meta_add_double (notification_t *n,
 +    const char *name,
 +    double value)
 +{
 +  return (plugin_notification_meta_add (n, name, NM_TYPE_DOUBLE, &value));
 +}
 +
 +int plugin_notification_meta_add_boolean (notification_t *n,
 +    const char *name,
 +    _Bool value)
 +{
 +  return (plugin_notification_meta_add (n, name, NM_TYPE_BOOLEAN, &value));
 +}
 +
 +int plugin_notification_meta_copy (notification_t *dst,
 +    const notification_t *src)
 +{
 +  notification_meta_t *meta;
 +
 +  assert (dst != NULL);
 +  assert (src != NULL);
 +  assert (dst != src);
 +  assert ((src->meta == NULL) || (src->meta != dst->meta));
 +
 +  for (meta = src->meta; meta != NULL; meta = meta->next)
 +  {
 +    if (meta->type == NM_TYPE_STRING)
 +      plugin_notification_meta_add_string (dst, meta->name,
 +          meta->nm_value.nm_string);
 +    else if (meta->type == NM_TYPE_SIGNED_INT)
 +      plugin_notification_meta_add_signed_int (dst, meta->name,
 +          meta->nm_value.nm_signed_int);
 +    else if (meta->type == NM_TYPE_UNSIGNED_INT)
 +      plugin_notification_meta_add_unsigned_int (dst, meta->name,
 +          meta->nm_value.nm_unsigned_int);
 +    else if (meta->type == NM_TYPE_DOUBLE)
 +      plugin_notification_meta_add_double (dst, meta->name,
 +          meta->nm_value.nm_double);
 +    else if (meta->type == NM_TYPE_BOOLEAN)
 +      plugin_notification_meta_add_boolean (dst, meta->name,
 +          meta->nm_value.nm_boolean);
 +  }
 +
 +  return (0);
 +} /* int plugin_notification_meta_copy */
 +
 +int plugin_notification_meta_free (notification_meta_t *n)
 +{
 +  notification_meta_t *this;
 +  notification_meta_t *next;
 +
 +  if (n == NULL)
 +  {
 +    ERROR ("plugin_notification_meta_free: n == NULL!");
 +    return (-1);
 +  }
 +
 +  this = n;
 +  while (this != NULL)
 +  {
 +    next = this->next;
 +
 +    if (this->type == NM_TYPE_STRING)
 +    {
 +      free ((char *)this->nm_value.nm_string);
 +      this->nm_value.nm_string = NULL;
 +    }
 +    sfree (this);
 +
 +    this = next;
 +  }
 +
 +  return (0);
 +} /* int plugin_notification_meta_free */
 +
 +static void plugin_ctx_destructor (void *ctx)
 +{
 +	sfree (ctx);
 +} /* void plugin_ctx_destructor */
 +
 +static plugin_ctx_t ctx_init = { /* interval = */ 0 };
 +
 +static plugin_ctx_t *plugin_ctx_create (void)
 +{
 +	plugin_ctx_t *ctx;
 +
 +	ctx = malloc (sizeof (*ctx));
 +	if (ctx == NULL) {
 +		char errbuf[1024];
 +		ERROR ("Failed to allocate plugin context: %s",
 +				sstrerror (errno, errbuf, sizeof (errbuf)));
 +		return NULL;
 +	}
 +
 +	*ctx = ctx_init;
 +	assert (plugin_ctx_key_initialized);
 +	pthread_setspecific (plugin_ctx_key, ctx);
 +	DEBUG("Created new plugin context.");
 +	return (ctx);
 +} /* int plugin_ctx_create */
 +
 +void plugin_init_ctx (void)
 +{
 +	pthread_key_create (&plugin_ctx_key, plugin_ctx_destructor);
 +	plugin_ctx_key_initialized = 1;
 +} /* void plugin_init_ctx */
 +
 +plugin_ctx_t plugin_get_ctx (void)
 +{
 +	plugin_ctx_t *ctx;
 +
 +	assert (plugin_ctx_key_initialized);
 +	ctx = pthread_getspecific (plugin_ctx_key);
 +
 +	if (ctx == NULL) {
 +		ctx = plugin_ctx_create ();
 +		/* this must no happen -- exit() instead? */
 +		if (ctx == NULL)
 +			return ctx_init;
 +	}
 +
 +	return (*ctx);
 +} /* plugin_ctx_t plugin_get_ctx */
 +
 +plugin_ctx_t plugin_set_ctx (plugin_ctx_t ctx)
 +{
 +	plugin_ctx_t *c;
 +	plugin_ctx_t old;
 +
 +	assert (plugin_ctx_key_initialized);
 +	c = pthread_getspecific (plugin_ctx_key);
 +
 +	if (c == NULL) {
 +		c = plugin_ctx_create ();
 +		/* this must no happen -- exit() instead? */
 +		if (c == NULL)
 +			return ctx_init;
 +	}
 +
 +	old = *c;
 +	*c = ctx;
 +
 +	return (old);
 +} /* void plugin_set_ctx */
 +
 +cdtime_t plugin_get_interval (void)
 +{
 +	cdtime_t interval;
 +
 +	interval = plugin_get_ctx().interval;
 +	if (interval > 0)
 +		return interval;
 +
 +	return cf_get_default_interval ();
 +} /* cdtime_t plugin_get_interval */
 +
 +typedef struct {
 +	plugin_ctx_t ctx;
 +	void *(*start_routine) (void *);
 +	void *arg;
 +} plugin_thread_t;
 +
 +static void *plugin_thread_start (void *arg)
 +{
 +	plugin_thread_t *plugin_thread = arg;
 +
 +	void *(*start_routine) (void *) = plugin_thread->start_routine;
 +	void *plugin_arg = plugin_thread->arg;
 +
 +	plugin_set_ctx (plugin_thread->ctx);
 +
 +	free (plugin_thread);
 +
 +	return start_routine (plugin_arg);
 +} /* void *plugin_thread_start */
 +
 +int plugin_thread_create (pthread_t *thread, const pthread_attr_t *attr,
 +		void *(*start_routine) (void *), void *arg)
 +{
 +	plugin_thread_t *plugin_thread;
 +
 +	plugin_thread = malloc (sizeof (*plugin_thread));
 +	if (plugin_thread == NULL)
 +		return -1;
 +
 +	plugin_thread->ctx           = plugin_get_ctx ();
 +	plugin_thread->start_routine = start_routine;
 +	plugin_thread->arg           = arg;
 +
 +	return pthread_create (thread, attr,
 +			plugin_thread_start, plugin_thread);
 +} /* int plugin_thread_create */
 +
 +/* vim: set sw=8 ts=8 noet fdm=marker : */