/**
* collectd - src/wireless.c
- * Copyright (C) 2006 Florian octo Forster
+ * Copyright (C) 2006,2007 Florian octo Forster
*
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2 of the License, or (at your
- * option) any later version.
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
*
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
*
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
*
- * Author:
- * Florian octo Forster <octo at verplant.org>
+ * Authors:
+ * Florian octo Forster <octo at collectd.org>
**/
#include "collectd.h"
+
#include "common.h"
#include "plugin.h"
-#define MODULE_NAME "wireless"
-#define BUFSIZE 1024
-
-#if defined(KERNEL_LINUX)
-# define WIRELESS_HAVE_READ 1
-#else
-# define WIRELESS_HAVE_READ 0
+#if !KERNEL_LINUX
+#error "No applicable input method."
#endif
#define WIRELESS_PROC_FILE "/proc/net/wireless"
-static char *filename_template = "wireless-%s.rrd";
-
-static char *ds_def[] =
-{
- "DS:quality:GAUGE:"COLLECTD_HEARTBEAT":0:U",
- "DS:power:GAUGE:"COLLECTD_HEARTBEAT":U:0",
- "DS:noise:GAUGE:"COLLECTD_HEARTBEAT":U:0",
- NULL
-};
-static int ds_num = 3;
-
-#if WIRELESS_HAVE_READ
-static int proc_file_found = 0;
-#endif
-
-static void wireless_init (void)
-{
-#if WIRELESS_HAVE_READ
- if (access (WIRELESS_PROC_FILE, R_OK) == 0)
- proc_file_found = 1;
- else
- proc_file_found = 0;
-#endif
-
- return;
-}
-
-static void wireless_write (char *host, char *inst, char *val)
-{
- char file[BUFSIZE];
- int status;
-
- status = snprintf (file, BUFSIZE, filename_template, inst);
- if (status < 1)
- return;
- else if (status >= BUFSIZE)
- return;
-
- rrd_update_file (host, file, val, ds_def, ds_num);
-}
-
-#if WIRELESS_HAVE_READ
#if 0
static double wireless_dbm_to_watt (double dbm)
{
/*
* dbm = 10 * log_{10} (1000 * power / W)
- * power = 10^(dbm/10) * W/1000
+ * power = 10^(dbm/10) * W/1000
*/
watt = pow (10.0, (dbm / 10.0)) / 1000.0;
- return (watt);
+ return watt;
}
#endif
-static void wireless_submit (char *device,
- double quality, double power, double noise)
-{
- char buf[BUFSIZE];
- int status;
+static void wireless_submit(const char *plugin_instance, const char *type,
+ double value) {
+ value_list_t vl = VALUE_LIST_INIT;
- status = snprintf (buf, BUFSIZE, "%u:%f:%f:%f",
- (unsigned int) curtime,
- quality, power, noise);
- if ((status < 1) || (status >= BUFSIZE))
- return;
+ vl.values = &(value_t){.gauge = value};
+ vl.values_len = 1;
+ sstrncpy(vl.plugin, "wireless", sizeof(vl.plugin));
+ sstrncpy(vl.plugin_instance, plugin_instance, sizeof(vl.plugin_instance));
+ sstrncpy(vl.type, type, sizeof(vl.type));
- plugin_submit (MODULE_NAME, device, buf);
-}
+ plugin_dispatch_values(&vl);
+} /* void wireless_submit */
#define POWER_MIN -90.0
#define POWER_MAX -50.0
-static double wireless_percent_to_power (double quality)
-{
- assert ((quality >= 0.0) && (quality <= 100.0));
+static double wireless_percent_to_power(double quality) {
+ assert((quality >= 0.0) && (quality <= 100.0));
- return ((quality * (POWER_MAX - POWER_MIN)) + POWER_MIN);
+ return (quality * (POWER_MAX - POWER_MIN)) + POWER_MIN;
} /* double wireless_percent_to_power */
-static void wireless_read (void)
-{
+static int wireless_read(void) {
#ifdef KERNEL_LINUX
-
- FILE *fh;
- char buffer[BUFSIZE];
-
- char *device;
- double quality;
- double power;
- double noise;
-
- char *fields[8];
- int numfields;
-
- int len;
-
- if (!proc_file_found)
- return;
-
- /* there are a variety of names for the wireless device */
- if ((fh = fopen (WIRELESS_PROC_FILE, "r")) == NULL)
- {
- syslog (LOG_WARNING, "wireless: fopen: %s", strerror (errno));
- return;
- }
-
- while (fgets (buffer, BUFSIZE, fh) != NULL)
- {
- char *endptr;
-
- numfields = strsplit (buffer, fields, 8);
-
- if (numfields < 5)
- continue;
-
- len = strlen (fields[0]) - 1;
- if (len < 1)
- continue;
- if (fields[0][len] != ':')
- continue;
- fields[0][len] = '\0';
-
- device = fields[0];
-
- quality = strtod (fields[2], &endptr);
- if (fields[2] == endptr)
- quality = -1.0; /* invalid */
-
- /* power [dBm] < 0.0 */
- power = strtod (fields[3], &endptr);
- if (fields[3] == endptr)
- power = 1.0; /* invalid */
- else if ((power >= 0.0) && (power <= 100.0))
- power = wireless_percent_to_power (power);
- else if (power > 100.0)
- power = 1.0; /* invalid */
-
- /* noise [dBm] < 0.0 */
- noise = strtod (fields[3], &endptr);
- if (fields[3] == endptr)
- noise = 1.0; /* invalid */
- else if ((noise >= 0.0) && (noise <= 100.0))
- noise = wireless_percent_to_power (noise);
- else if (noise > 100.0)
- noise = 1.0; /* invalid */
-
- wireless_submit (device, quality, power, noise);
- }
-
- fclose (fh);
+ FILE *fh;
+ char buffer[1024];
+
+ char *device;
+ double quality;
+ double power;
+ double noise;
+
+ char *fields[8];
+ int numfields;
+
+ int devices_found;
+ size_t len;
+
+ /* there are a variety of names for the wireless device */
+ if ((fh = fopen(WIRELESS_PROC_FILE, "r")) == NULL) {
+ WARNING("wireless: fopen: %s", STRERRNO);
+ return -1;
+ }
+
+ devices_found = 0;
+ while (fgets(buffer, sizeof(buffer), fh) != NULL) {
+ char *endptr;
+
+ numfields = strsplit(buffer, fields, 8);
+
+ if (numfields < 5)
+ continue;
+
+ len = strlen(fields[0]) - 1;
+ if (len < 1)
+ continue;
+ if (fields[0][len] != ':')
+ continue;
+ fields[0][len] = '\0';
+
+ device = fields[0];
+
+ quality = strtod(fields[2], &endptr);
+ if (fields[2] == endptr)
+ quality = -1.0; /* invalid */
+
+ /* power [dBm] < 0.0 */
+ power = strtod(fields[3], &endptr);
+ if (fields[3] == endptr)
+ power = 1.0; /* invalid */
+ else if ((power >= 0.0) && (power <= 100.0))
+ power = wireless_percent_to_power(power);
+ else if ((power > 100.0) && (power <= 256.0))
+ power = power - 256.0;
+ else if (power > 0.0)
+ power = 1.0; /* invalid */
+
+ /* noise [dBm] < 0.0 */
+ noise = strtod(fields[4], &endptr);
+ if (fields[4] == endptr)
+ noise = 1.0; /* invalid */
+ else if ((noise >= 0.0) && (noise <= 100.0))
+ noise = wireless_percent_to_power(noise);
+ else if ((noise > 100.0) && (noise <= 256.0))
+ noise = noise - 256.0;
+ else if (noise > 0.0)
+ noise = 1.0; /* invalid */
+
+ wireless_submit(device, "signal_quality", quality);
+ wireless_submit(device, "signal_power", power);
+ wireless_submit(device, "signal_noise", noise);
+
+ devices_found++;
+ }
+
+ fclose(fh);
+
+ /* If no wireless devices are present return an error, so the plugin
+ * code delays our read function. */
+ if (devices_found == 0)
+ return -1;
#endif /* KERNEL_LINUX */
-}
-#else
-# define wireless_read NULL
-#endif /* WIRELESS_HAVE_READ */
-void module_register (void)
-{
- plugin_register (MODULE_NAME, wireless_init, wireless_read, wireless_write);
-}
+ return 0;
+} /* int wireless_read */
-#undef BUFSIZE
-#undef MODULE_NAME
+void module_register(void) {
+ plugin_register_read("wireless", wireless_read);
+} /* void module_register */
projects / collectd.git / blobdiff