1 /**
2 * collectd - src/common.h
3 * Copyright (C) 2005,2006 Florian octo Forster
4 *
5 * This program is free software; you can redistribute it and/
6 * or modify it under the terms of the GNU General Public Li-
7 * cence as published by the Free Software Foundation; either
8 * version 2 of the Licence, or any later version.
9 *
10 * This program is distributed in the hope that it will be use-
11 * ful, but WITHOUT ANY WARRANTY; without even the implied war-
12 * ranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
13 * See the GNU General Public Licence for more details.
14 *
15 * You should have received a copy of the GNU General Public
16 * Licence along with this program; if not, write to the Free
17 * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139,
18 * USA.
19 *
20 * Authors:
21 * Florian octo Forster <octo at verplant.org>
22 * Niki W. Waibel <niki.waibel@gmx.net>
23 **/
25 #ifndef COMMON_H
26 #define COMMON_H
28 #include "collectd.h"
30 #define sfree(ptr) \
31 if((ptr) != NULL) { \
32 free(ptr); \
33 } \
34 (ptr) = NULL
36 void sstrncpy(char *d, const char *s, int len);
37 char *sstrdup(const char *s);
38 void *smalloc(size_t size);
40 /*
41 * NAME
42 * sread
43 *
44 * DESCRIPTION
45 * Reads exactly `n' bytes or failes. Syntax and other behavior is analogous
46 * to `read(2)'.
47 *
48 * PARAMETERS
49 * `fd' File descriptor to write to.
50 * `buf' Buffer that is to be written.
51 * `count' Numver of bytes in the buffer.
52 *
53 * RETURN VALUE
54 * Zero upon success or non-zero if an error occured. `errno' is set in this
55 * case.
56 */
57 ssize_t sread (int fd, void *buf, size_t count);
59 /*
60 * NAME
61 * swrite
62 *
63 * DESCRIPTION
64 * Writes exactly `n' bytes or failes. Syntax and other behavior is analogous
65 * to `write(2)'.
66 *
67 * PARAMETERS
68 * `fd' File descriptor to write to.
69 * `buf' Buffer that is to be written.
70 * `count' Numver of bytes in the buffer.
71 *
72 * RETURN VALUE
73 * Zero upon success or non-zero if an error occured. `errno' is set in this
74 * case.
75 */
76 ssize_t swrite (int fd, const void *buf, size_t count);
78 /*
79 * NAME
80 * strsplit
81 *
82 * DESCRIPTION
83 * Splits a string into parts and stores pointers to the parts in `fields'.
84 * The characters split at are ` ' (space) and "\t" (tab).
85 *
86 * PARAMETERS
87 * `string' String to split. This string will be modified. `fields' will
88 * contain pointers to parts of this string, so free'ing it
89 * will destroy `fields' as well.
90 * `fields' Array of strings where pointers to the parts will be stored.
91 * `size' Number of elements in the array. No more than `size'
92 * pointers will be stored in `fields'.
93 *
94 * RETURN VALUE
95 * Returns the number of parts stored in `fields'.
96 */
97 int strsplit (char *string, char **fields, size_t size);
99 /*
100 * NAME
101 * strjoin
102 *
103 * DESCRIPTION
104 * Joins together several parts of a string using `sep' as a seperator. This
105 * is equipollent to the perl buildin `join'.
106 *
107 * PARAMETERS
108 * `dst' Buffer where the result is stored.
109 * `dst_len' Length of the destination buffer. No more than this many
110 * bytes will be written to the memory pointed to by `dst',
111 * including the trailing null-byte.
112 * `fields' Array of strings to be joined.
113 * `fields_num' Number of elements in the `fields' array.
114 * `sep' String to be inserted between any two elements of `fields'.
115 * This string is neither prepended nor appended to the result.
116 * Instead of passing "" (empty string) one can pass NULL.
117 *
118 * RETURN VALUE
119 * Returns the number of characters in `dst', NOT including the trailing
120 * null-byte. If an error occured (empty array or `dst' too small) a value
121 * smaller than zero will be returned.
122 */
123 int strjoin (char *dst, size_t dst_len, char **fields, size_t fields_num, const char *sep);
125 /*
126 * NAME
127 * escape_slashes
128 *
129 * DESCRIPTION
130 * Removes slashes from the string `buf' and substitutes them with something
131 * appropriate. This function should be used whenever a path is to be used as
132 * (part of) an instance.
133 *
134 * PARAMETERS
135 * `buf' String to be escaped.
136 * `buf_len' Length of the buffer. No more then this many bytes will be
137 * written to `buf', including the trailing null-byte.
138 *
139 * RETURN VALUE
140 * Returns zero upon success and a value smaller than zero upon failure.
141 */
142 int escape_slashes (char *buf, int buf_len);
144 /* FIXME: `timeval_sub_timespec' needs a description */
145 int timeval_sub_timespec (struct timeval *tv0, struct timeval *tv1, struct timespec *ret);
147 int rrd_update_file (char *host, char *file, char *values,
148 char **ds_def, int ds_num);
150 #ifdef HAVE_LIBKSTAT
151 int get_kstat (kstat_t **ksp_ptr, char *module, int instance, char *name);
152 long long get_kstat_value (kstat_t *ksp, char *name);
153 #endif
155 #endif /* COMMON_H */