2 * collectd - src/serial.c
3 * Copyright (C) 2005,2006 David Bacher
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.
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.
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
20 * David Bacher <drbacher at gmail.com>
21 * Florian octo Forster <octo at collectd.org>
27 #include "utils/common/common.h"
30 #error "No applicable input method."
33 static void serial_submit(const char *type_instance, derive_t rx, derive_t tx) {
34 value_list_t vl = VALUE_LIST_INIT;
41 vl.values_len = STATIC_ARRAY_SIZE(values);
42 sstrncpy(vl.plugin, "serial", sizeof(vl.plugin));
43 sstrncpy(vl.type, "serial_octets", sizeof(vl.type));
44 sstrncpy(vl.type_instance, type_instance, sizeof(vl.type_instance));
46 plugin_dispatch_values(&vl);
49 static int serial_read(void) {
53 /* there are a variety of names for the serial device */
54 if ((fh = fopen("/proc/tty/driver/serial", "r")) == NULL &&
55 (fh = fopen("/proc/tty/driver/ttyS", "r")) == NULL) {
56 WARNING("serial: fopen: %s", STRERRNO);
60 while (fgets(buffer, sizeof(buffer), fh) != NULL) {
70 numfields = strsplit(buffer, fields, STATIC_ARRAY_SIZE(fields));
75 * 0: uart:16550A port:000003F8 irq:4 tx:0 rx:0
76 * 1: uart:16550A port:000002F8 irq:3 tx:0 rx:0
78 len = strlen(fields[0]);
81 if (fields[0][len - 1] != ':')
83 fields[0][len - 1] = '\0';
85 for (int i = 1; i < numfields; i++) {
86 len = strlen(fields[i]);
90 if (strncmp(fields[i], "tx:", 3) == 0) {
91 if (strtoderive(fields[i] + 3, &tx) == 0)
93 } else if (strncmp(fields[i], "rx:", 3) == 0) {
94 if (strtoderive(fields[i] + 3, &rx) == 0)
99 if (have_rx && have_tx)
100 serial_submit(fields[0], rx, tx);
105 } /* int serial_read */
107 void module_register(void) {
108 plugin_register_read("serial", serial_read);
109 } /* void module_register */