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>
30 # error "No applicable input method."
33 static void serial_submit (const char *type_instance,
34 derive_t rx, derive_t tx)
36 value_list_t vl = VALUE_LIST_INIT;
43 vl.values_len = STATIC_ARRAY_SIZE (values);
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);
52 static int serial_read (void)
57 /* there are a variety of names for the serial device */
58 if ((fh = fopen ("/proc/tty/driver/serial", "r")) == NULL &&
59 (fh = fopen ("/proc/tty/driver/ttyS", "r")) == NULL)
62 WARNING ("serial: fopen: %s",
63 sstrerror (errno, errbuf, sizeof (errbuf)));
67 while (fgets (buffer, sizeof (buffer), fh) != NULL)
71 _Bool have_rx = 0, have_tx = 0;
77 numfields = strsplit (buffer, fields, STATIC_ARRAY_SIZE (fields));
82 * 0: uart:16550A port:000003F8 irq:4 tx:0 rx:0
83 * 1: uart:16550A port:000002F8 irq:3 tx:0 rx:0
85 len = strlen (fields[0]);
88 if (fields[0][len - 1] != ':')
90 fields[0][len - 1] = 0;
92 for (int i = 1; i < numfields; i++)
94 len = strlen (fields[i]);
98 if (strncmp (fields[i], "tx:", 3) == 0)
100 if (strtoderive (fields[i] + 3, &tx) == 0)
103 else if (strncmp (fields[i], "rx:", 3) == 0)
105 if (strtoderive (fields[i] + 3, &rx) == 0)
110 if (have_rx && have_tx)
111 serial_submit (fields[0], rx, tx);
116 } /* int serial_read */
118 void module_register (void)
120 plugin_register_read ("serial", serial_read);
121 } /* void module_register */