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_list_t vl = VALUE_LIST_INIT;
35 value_t values[] = {
36 {.derive = rx}, {.derive = tx},
37 };
39 vl.values = values;
40 vl.values_len = STATIC_ARRAY_SIZE(values);
41 sstrncpy(vl.plugin, "serial", sizeof(vl.plugin));
42 sstrncpy(vl.type, "serial_octets", sizeof(vl.type));
43 sstrncpy(vl.type_instance, type_instance, sizeof(vl.type_instance));
45 plugin_dispatch_values(&vl);
46 }
48 static int serial_read(void) {
49 FILE *fh;
50 char buffer[1024];
52 /* there are a variety of names for the serial device */
53 if ((fh = fopen("/proc/tty/driver/serial", "r")) == NULL &&
54 (fh = fopen("/proc/tty/driver/ttyS", "r")) == NULL) {
55 char errbuf[1024];
56 WARNING("serial: fopen: %s", sstrerror(errno, errbuf, sizeof(errbuf)));
57 return (-1);
58 }
60 while (fgets(buffer, sizeof(buffer), fh) != NULL) {
61 derive_t rx = 0;
62 derive_t tx = 0;
63 _Bool have_rx = 0, have_tx = 0;
64 size_t len;
66 char *fields[16];
67 int numfields;
69 numfields = strsplit(buffer, fields, STATIC_ARRAY_SIZE(fields));
70 if (numfields < 6)
71 continue;
73 /*
74 * 0: uart:16550A port:000003F8 irq:4 tx:0 rx:0
75 * 1: uart:16550A port:000002F8 irq:3 tx:0 rx:0
76 */
77 len = strlen(fields[0]);
78 if (len < 2)
79 continue;
80 if (fields[0][len - 1] != ':')
81 continue;
82 fields[0][len - 1] = 0;
84 for (int i = 1; i < numfields; i++) {
85 len = strlen(fields[i]);
86 if (len < 4)
87 continue;
89 if (strncmp(fields[i], "tx:", 3) == 0) {
90 if (strtoderive(fields[i] + 3, &tx) == 0)
91 have_tx = 1;
92 } else if (strncmp(fields[i], "rx:", 3) == 0) {
93 if (strtoderive(fields[i] + 3, &rx) == 0)
94 have_rx = 1;
95 }
96 }
98 if (have_rx && have_tx)
99 serial_submit(fields[0], rx, tx);
100 }
102 fclose(fh);
103 return (0);
104 } /* int serial_read */
106 void module_register(void) {
107 plugin_register_read("serial", serial_read);
108 } /* void module_register */