2 * collectd - src/collectd.c
3 * Copyright (C) 2005 Florian octo Forster
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 * Florian octo Forster <octo at verplant.org>
21 * Alvaro Barcellos <alvaro.barcellos at gmail.com>
26 #include "multicast.h"
35 #endif /* HAVE_LIBKSTAT */
38 char *pinghosts[MAX_PINGHOSTS];
39 int num_pinghosts = 0;
51 void sigIntHandler (int signal)
56 int change_basedir (char *dir)
58 int dirlen = strlen (dir);
60 while ((dirlen > 0) && (dir[dirlen - 1] == '/'))
66 if (chdir (dir) == -1)
70 if (mkdir (dir, 0755) == -1)
72 syslog (LOG_ERR, "mkdir: %s", strerror (errno));
75 else if (chdir (dir) == -1)
77 syslog (LOG_ERR, "chdir: %s", strerror (errno));
83 syslog (LOG_ERR, "chdir: %s", strerror (errno));
92 void update_kstat (void)
96 if ((kc = kstat_open ()) == NULL)
97 syslog (LOG_ERR, "Unable to open kstat control structure");
102 kid = kstat_chain_update (kc);
105 syslog (LOG_INFO, "kstat chain has been updated");
109 syslog (LOG_ERR, "kstat chain update failed");
110 /* else: everything works as expected */
115 #endif /* HAVE_LIBKSTAT */
117 void exit_usage (char *name)
119 printf ("Usage: %s [OPTIONS]\n\n"
121 "Available options:\n"
123 " -d <dir> Base directory to use.\n"
125 " -P <dir> Set the plugin-directory\n"
127 " -f Don't fork to the background\n"
129 " -l Start in local mode (no network)\n"
130 " -c Start in client (sender) mode\n"
131 " -s Start in server (listener) mode\n"
132 #endif /* HAVE_LIBRRD */
135 " -p <host> Host to ping periodically, may be repeated to ping\n"
136 " more than one host.\n"
137 #endif /* COLLECT_PING */
138 "\n%s %s, http://verplant.org/collectd/\n"
139 "by Florian octo Forster <octo@verplant.org>\n"
140 "for contributions see `AUTHORS'\n",
141 PACKAGE, DATADIR, PLUGINDIR, PACKAGE, VERSION);
145 int start_client (void)
154 #ifdef HAVE_LIBSTATGRAB
157 syslog (LOG_ERR, "sg_init: %s", sg_str_error (sg_get_error ()));
161 if (sg_drop_privileges ())
163 syslog (LOG_ERR, "sg_drop_privileges: %s", sg_str_error (sg_get_error ()));
172 curtime = time (NULL);
179 while (sleepingtime != 0)
183 sleepingtime = sleep (sleepingtime);
191 int start_server (void)
200 if (multicast_receive (&host, &type, &instance, &values) == 0)
201 plugin_write (host, type, instance, values);
203 if (host != NULL) free (host); host = NULL;
204 if (type != NULL) free (type); type = NULL;
205 if (instance != NULL) free (instance); instance = NULL;
206 if (values != NULL) free (values); values = NULL;
211 #endif /* HAVE_LIBRRD */
213 int pidfile_create (void)
217 if ((fh = fopen (PIDFILE, "w")) == NULL)
219 syslog (LOG_ERR, "fopen (pidfile): %s", strerror (errno));
223 fprintf (fh, "%d\n", getpid());
229 int pidfile_remove (void)
231 return (unlink (PIDFILE));
234 int main (int argc, char **argv)
236 struct sigaction sigIntAction, sigChldAction;
241 char *plugindir = NULL;
242 char *basedir = DATADIR;
247 operating_mode = MODE_LOCAL;
253 openlog (PACKAGE, LOG_CONS | LOG_PID, LOG_DAEMON);
262 c = getopt (argc, argv, "d:fP:h"
265 #endif /* HAVE_LIBRRD */
268 #endif /* COLLECT_PING */
278 operating_mode = MODE_CLIENT;
282 operating_mode = MODE_SERVER;
286 operating_mode = MODE_LOCAL;
288 #endif /* HAVE_LIBRRD */
297 if (num_pinghosts < MAX_PINGHOSTS)
298 pinghosts[num_pinghosts++] = optarg;
300 fprintf (stderr, "Maximum of %i ping hosts reached.\n", MAX_PINGHOSTS);
302 #endif /* COLLECT_PING */
309 exit_usage (argv[0]);
315 * Load plugins and change to output directory
316 * Loading plugins is done first so relative paths work as expected..
318 if (plugin_load_all (plugindir) < 1)
320 fprintf (stderr, "Error: No plugins found.\n");
324 if (change_basedir (basedir))
326 fprintf (stderr, "Error: Unable to change to directory `%s'.\n", basedir);
331 * install signal handlers
333 sigIntAction.sa_handler = sigIntHandler;
334 sigaction (SIGINT, &sigIntAction, NULL);
336 sigChldAction.sa_handler = SIG_IGN;
337 sigaction (SIGCHLD, &sigChldAction, NULL);
345 if ((pid = fork ()) == -1)
348 fprintf (stderr, "fork: %s", strerror (errno));
354 /* printf ("Running (PID %i)\n", pid); */
358 /* Detach from session */
362 if (pidfile_create ())
365 /* close standard descriptors */
370 if (open ("/dev/null", O_RDWR) != 0)
372 syslog (LOG_ERR, "Error: Could not connect `STDIN' to `/dev/null'");
377 syslog (LOG_ERR, "Error: Could not connect `STDOUT' to `/dev/null'");
382 syslog (LOG_ERR, "Error: Could not connect `STDERR' to `/dev/null'");
385 } /* if (daemonize) */
386 #endif /* COLLECT_DAEMON */
389 * run the actual loops
392 if (operating_mode == MODE_SERVER)
394 else /* if (operating_mode == MODE_CLIENT || operating_mode == MODE_LOCAL) */
401 syslog (LOG_INFO, "Exiting normally");