1 /**
2 * collectd - src/serial.c
3 * Copyright (C) 2005,2006 David Bacher
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the
7 * Free Software Foundation; either version 2 of the License, or (at your
8 * option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
18 *
19 * Authors:
20 * David Bacher <drbacher at gmail.com>
21 * Florian octo Forster <octo at verplant.org>
22 **/
24 #include "collectd.h"
25 #include "common.h"
26 #include "plugin.h"
28 #if !KERNEL_LINUX
29 # error "No applicable input method."
30 #endif
32 static void serial_submit (const char *type_instance,
33 counter_t rx, counter_t tx)
34 {
35 value_t values[2];
36 value_list_t vl = VALUE_LIST_INIT;
38 values[0].counter = rx;
39 values[1].counter = tx;
41 vl.values = values;
42 vl.values_len = 2;
43 sstrncpy (vl.host, hostname_g, sizeof (vl.host));
44 sstrncpy (vl.plugin, "serial", sizeof (vl.plugin));
45 sstrncpy (vl.type, "serial_octets", sizeof (vl.type));
46 sstrncpy (vl.type_instance, type_instance,
47 sizeof (vl.type_instance));
49 plugin_dispatch_values (&vl);
50 }
52 static int serial_read (void)
53 {
54 FILE *fh;
55 char buffer[1024];
57 counter_t rx = 0;
58 counter_t tx = 0;
60 char *fields[16];
61 int i, numfields;
62 int len;
64 /* there are a variety of names for the serial device */
65 if ((fh = fopen ("/proc/tty/driver/serial", "r")) == NULL &&
66 (fh = fopen ("/proc/tty/driver/ttyS", "r")) == NULL)
67 {
68 char errbuf[1024];
69 WARNING ("serial: fopen: %s",
70 sstrerror (errno, errbuf, sizeof (errbuf)));
71 return (-1);
72 }
74 while (fgets (buffer, sizeof (buffer), fh) != NULL)
75 {
76 int have_rx = 0, have_tx = 0;
78 numfields = strsplit (buffer, fields, 16);
80 if (numfields < 6)
81 continue;
83 /*
84 * 0: uart:16550A port:000003F8 irq:4 tx:0 rx:0
85 * 1: uart:16550A port:000002F8 irq:3 tx:0 rx:0
86 */
87 len = strlen (fields[0]) - 1;
88 if (len < 1)
89 continue;
90 if (fields[0][len] != ':')
91 continue;
92 fields[0][len] = '\0';
94 for (i = 1; i < numfields; i++)
95 {
96 len = strlen (fields[i]);
97 if (len < 4)
98 continue;
100 if (strncmp (fields[i], "tx:", 3) == 0)
101 {
102 tx = atoll (fields[i] + 3);
103 have_tx++;
104 }
105 else if (strncmp (fields[i], "rx:", 3) == 0)
106 {
107 rx = atoll (fields[i] + 3);
108 have_rx++;
109 }
110 }
112 if ((have_rx == 0) || (have_tx == 0))
113 continue;
115 serial_submit (fields[0], rx, tx);
116 }
118 fclose (fh);
119 return (0);
120 } /* int serial_read */
122 void module_register (void)
123 {
124 plugin_register_read ("serial", serial_read);
125 } /* void module_register */