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>
25 #include "multicast.h"
34 #endif /* HAVE_LIBKSTAT */
37 char *pinghosts[MAX_PINGHOSTS];
38 int num_pinghosts = 0;
50 void sigIntHandler (int signal)
55 int change_basedir (char *dir)
57 int dirlen = strlen (dir);
59 while ((dirlen > 0) && (dir[dirlen - 1] == '/'))
65 if (chdir (dir) == -1)
69 if (mkdir (dir, 0755) == -1)
71 syslog (LOG_ERR, "mkdir: %s", strerror (errno));
74 else if (chdir (dir) == -1)
76 syslog (LOG_ERR, "chdir: %s", strerror (errno));
82 syslog (LOG_ERR, "chdir: %s", strerror (errno));
91 void update_kstat (void)
95 if ((kc = kstat_open ()) == NULL)
96 syslog (LOG_ERR, "Unable to open kstat control structure");
101 kid = kstat_chain_update (kc);
104 syslog (LOG_INFO, "kstat chain has been updated");
108 syslog (LOG_ERR, "kstat chain update failed");
109 /* else: everything works as expected */
114 #endif /* HAVE_LIBKSTAT */
116 void exit_usage (char *name)
118 printf ("Usage: %s [OPTIONS]\n\n"
120 "Available options:\n"
122 " -d <dir> Base directory to use.\n"
124 " -P <dir> Set the plugin-directory\n"
126 " -f Don't fork to the background\n"
128 " -l Start in local mode (no network)\n"
129 " -c Start in client (sender) mode\n"
130 " -s Start in server (listener) mode\n"
131 #endif /* HAVE_LIBRRD */
134 " -p <host> Host to ping periodically, may be repeated to ping\n"
135 " more than one host.\n"
136 #endif /* COLLECT_PING */
137 "\n%s %s, http://verplant.org/collectd/\n"
138 "by Florian octo Forster <octo@verplant.org>\n"
139 "for contributions see `AUTHORS'\n",
140 PACKAGE, DATADIR, PLUGINDIR, PACKAGE, VERSION);
144 int start_client (void)
153 #ifdef HAVE_LIBSTATGRAB
156 syslog (LOG_ERR, "sg_init: %s", sg_str_error (sg_get_error ()));
160 if (sg_drop_privileges ())
162 syslog (LOG_ERR, "sg_drop_privileges: %s", sg_str_error (sg_get_error ()));
171 curtime = time (NULL);
178 while (sleepingtime != 0)
182 sleepingtime = sleep (sleepingtime);
190 int start_server (void)
199 if (multicast_receive (&host, &type, &instance, &values) == 0)
200 plugin_write (host, type, instance, values);
202 if (host != NULL) free (host); host = NULL;
203 if (type != NULL) free (type); type = NULL;
204 if (instance != NULL) free (instance); instance = NULL;
205 if (values != NULL) free (values); values = NULL;
210 #endif /* HAVE_LIBRRD */
212 int pidfile_create (void)
216 if ((fh = fopen (PIDFILE, "w")) == NULL)
218 syslog (LOG_ERR, "fopen (pidfile): %s", strerror (errno));
222 fprintf (fh, "%d\n", getpid());
228 int pidfile_remove (void)
230 return (unlink (PIDFILE));
233 int main (int argc, char **argv)
235 struct sigaction sigIntAction, sigChldAction;
240 char *plugindir = NULL;
241 char *basedir = DATADIR;
246 operating_mode = MODE_LOCAL;
252 openlog (PACKAGE, LOG_CONS | LOG_PID, LOG_DAEMON);
261 c = getopt (argc, argv, "d:fP:h"
264 #endif /* HAVE_LIBRRD */
267 #endif /* COLLECT_PING */
277 operating_mode = MODE_CLIENT;
281 operating_mode = MODE_SERVER;
285 operating_mode = MODE_LOCAL;
287 #endif /* HAVE_LIBRRD */
296 if (num_pinghosts < MAX_PINGHOSTS)
297 pinghosts[num_pinghosts++] = optarg;
299 fprintf (stderr, "Maximum of %i ping hosts reached.\n", MAX_PINGHOSTS);
301 #endif /* COLLECT_PING */
308 exit_usage (argv[0]);
314 * Load plugins and change to output directory
315 * Loading plugins is done first so relative paths work as expected..
317 if (plugin_load_all (plugindir) < 1)
319 fprintf (stderr, "Error: No plugins found.\n");
323 if (change_basedir (basedir))
325 fprintf (stderr, "Error: Unable to change to directory `%s'.\n", basedir);
330 * install signal handlers
332 sigIntAction.sa_handler = sigIntHandler;
333 sigaction (SIGINT, &sigIntAction, NULL);
335 sigChldAction.sa_handler = SIG_IGN;
336 sigaction (SIGCHLD, &sigChldAction, NULL);
344 if ((pid = fork ()) == -1)
347 fprintf (stderr, "fork: %s", strerror (errno));
353 /* printf ("Running (PID %i)\n", pid); */
357 /* Detach from session */
361 if (pidfile_create ())
364 /* close standard descriptors */
369 if (open ("/dev/null", O_RDWR) != 0)
371 syslog (LOG_ERR, "Error: Could not connect `STDIN' to `/dev/null'");
376 syslog (LOG_ERR, "Error: Could not connect `STDOUT' to `/dev/null'");
381 syslog (LOG_ERR, "Error: Could not connect `STDERR' to `/dev/null'");
384 } /* if (daemonize) */
385 #endif /* COLLECT_DAEMON */
388 * run the actual loops
391 if (operating_mode == MODE_SERVER)
393 else /* if (operating_mode == MODE_CLIENT || operating_mode == MODE_LOCAL) */
400 syslog (LOG_INFO, "Exiting normally");