10396fcf144ef52def61438a113cd12cde8c27c4
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 collectd.org>
22 **/
24 #include "collectd.h"
26 #include "common.h"
27 #include "plugin.h"
29 #if !KERNEL_LINUX
30 #error "No applicable input method."
31 #endif
33 static void serial_submit(const char *type_instance, derive_t rx, derive_t tx) {
34 value_t values[2];
35 value_list_t vl = VALUE_LIST_INIT;
37 values[0].derive = rx;
38 values[1].derive = tx;
40 vl.values = values;
41 vl.values_len = 2;
42 sstrncpy(vl.host, hostname_g, sizeof(vl.host));
43 sstrncpy(vl.plugin, "serial", sizeof(vl.plugin));
44 sstrncpy(vl.type, "serial_octets", sizeof(vl.type));
45 sstrncpy(vl.type_instance, type_instance, sizeof(vl.type_instance));
47 plugin_dispatch_values(&vl);
48 }
50 static int serial_read(void) {
51 FILE *fh;
52 char buffer[1024];
54 /* there are a variety of names for the serial device */
55 if ((fh = fopen("/proc/tty/driver/serial", "r")) == NULL &&
56 (fh = fopen("/proc/tty/driver/ttyS", "r")) == NULL) {
57 char errbuf[1024];
58 WARNING("serial: fopen: %s", sstrerror(errno, errbuf, sizeof(errbuf)));
59 return (-1);
60 }
62 while (fgets(buffer, sizeof(buffer), fh) != NULL) {
63 derive_t rx = 0;
64 derive_t tx = 0;
65 _Bool have_rx = 0, have_tx = 0;
66 size_t len;
68 char *fields[16];
69 int numfields;
71 numfields = strsplit(buffer, fields, STATIC_ARRAY_SIZE(fields));
72 if (numfields < 6)
73 continue;
75 /*
76 * 0: uart:16550A port:000003F8 irq:4 tx:0 rx:0
77 * 1: uart:16550A port:000002F8 irq:3 tx:0 rx:0
78 */
79 len = strlen(fields[0]);
80 if (len < 2)
81 continue;
82 if (fields[0][len - 1] != ':')
83 continue;
84 fields[0][len - 1] = 0;
86 for (int i = 1; i < numfields; i++) {
87 len = strlen(fields[i]);
88 if (len < 4)
89 continue;
91 if (strncmp(fields[i], "tx:", 3) == 0) {
92 if (strtoderive(fields[i] + 3, &tx) == 0)
93 have_tx = 1;
94 } else if (strncmp(fields[i], "rx:", 3) == 0) {
95 if (strtoderive(fields[i] + 3, &rx) == 0)
96 have_rx = 1;
97 }
98 }
100 if (have_rx && have_tx)
101 serial_submit(fields[0], rx, tx);
102 }
104 fclose(fh);
105 return (0);
106 } /* int serial_read */
108 void module_register(void) {
109 plugin_register_read("serial", serial_read);
110 } /* void module_register */