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 vl.time = time (NULL);
44 sstrncpy (vl.host, hostname_g, sizeof (vl.host));
45 sstrncpy (vl.plugin, "serial", sizeof (vl.plugin));
46 sstrncpy (vl.type, "serial_octets", sizeof (vl.type));
47 sstrncpy (vl.type_instance, type_instance,
48 sizeof (vl.type_instance));
50 plugin_dispatch_values (&vl);
51 }
53 static int serial_read (void)
54 {
55 FILE *fh;
56 char buffer[1024];
58 counter_t rx = 0;
59 counter_t tx = 0;
61 char *fields[16];
62 int i, numfields;
63 int len;
65 /* there are a variety of names for the serial device */
66 if ((fh = fopen ("/proc/tty/driver/serial", "r")) == NULL &&
67 (fh = fopen ("/proc/tty/driver/ttyS", "r")) == NULL)
68 {
69 char errbuf[1024];
70 WARNING ("serial: fopen: %s",
71 sstrerror (errno, errbuf, sizeof (errbuf)));
72 return (-1);
73 }
75 while (fgets (buffer, sizeof (buffer), fh) != NULL)
76 {
77 int have_rx = 0, have_tx = 0;
79 numfields = strsplit (buffer, fields, 16);
81 if (numfields < 6)
82 continue;
84 /*
85 * 0: uart:16550A port:000003F8 irq:4 tx:0 rx:0
86 * 1: uart:16550A port:000002F8 irq:3 tx:0 rx:0
87 */
88 len = strlen (fields[0]) - 1;
89 if (len < 1)
90 continue;
91 if (fields[0][len] != ':')
92 continue;
93 fields[0][len] = '\0';
95 for (i = 1; i < numfields; i++)
96 {
97 len = strlen (fields[i]);
98 if (len < 4)
99 continue;
101 if (strncmp (fields[i], "tx:", 3) == 0)
102 {
103 tx = atoll (fields[i] + 3);
104 have_tx++;
105 }
106 else if (strncmp (fields[i], "rx:", 3) == 0)
107 {
108 rx = atoll (fields[i] + 3);
109 have_rx++;
110 }
111 }
113 if ((have_rx == 0) || (have_tx == 0))
114 continue;
116 serial_submit (fields[0], rx, tx);
117 }
119 fclose (fh);
120 return (0);
121 } /* int serial_read */
123 void module_register (void)
124 {
125 plugin_register_read ("serial", serial_read);
126 } /* void module_register */