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"
28 #include "configfile.h"
36 #endif /* HAVE_LIBKSTAT */
39 char *pinghosts[MAX_PINGHOSTS];
40 int num_pinghosts = 0;
52 void sigIntHandler (int signal)
57 int change_basedir (char *dir)
59 int dirlen = strlen (dir);
61 while ((dirlen > 0) && (dir[dirlen - 1] == '/'))
67 if (chdir (dir) == -1)
71 if (mkdir (dir, 0755) == -1)
73 syslog (LOG_ERR, "mkdir (%s): %s", dir, strerror (errno));
76 else if (chdir (dir) == -1)
78 syslog (LOG_ERR, "chdir (%s): %s", dir, strerror (errno));
84 syslog (LOG_ERR, "chdir: %s", strerror (errno));
93 void update_kstat (void)
97 if ((kc = kstat_open ()) == NULL)
98 syslog (LOG_ERR, "Unable to open kstat control structure");
103 kid = kstat_chain_update (kc);
106 syslog (LOG_INFO, "kstat chain has been updated");
110 syslog (LOG_ERR, "kstat chain update failed");
111 /* else: everything works as expected */
116 #endif /* HAVE_LIBKSTAT */
118 void exit_usage (char *name)
120 printf ("Usage: %s [OPTIONS]\n\n"
122 "Available options:\n"
124 " -C <dir> Configuration file.\n"
126 " -P <file> PID File.\n"
128 " -M <dir> Module/Plugin directory.\n"
130 " -D <dir> Data storage directory.\n"
132 " -f Don't fork to the background.\n"
134 " -l Start in local mode (no network).\n"
135 " -c Start in client (sender) mode.\n"
136 " -s Start in server (listener) mode.\n"
137 #endif /* HAVE_LIBRRD */
140 " -p <host> Host to ping periodically, may be repeated to ping\n"
141 " more than one host.\n"
142 #endif /* COLLECT_PING */
143 "\n%s %s, http://verplant.org/collectd/\n"
144 "by Florian octo Forster <octo@verplant.org>\n"
145 "for contributions see `AUTHORS'\n",
146 PACKAGE, CONFIGFILE, PIDFILE, PLUGINDIR, PKGLOCALSTATEDIR, PACKAGE, VERSION);
150 int start_client (void)
159 #ifdef HAVE_LIBSTATGRAB
162 syslog (LOG_ERR, "sg_init: %s", sg_str_error (sg_get_error ()));
166 if (sg_drop_privileges ())
168 syslog (LOG_ERR, "sg_drop_privileges: %s", sg_str_error (sg_get_error ()));
177 curtime = time (NULL);
184 while (sleepingtime != 0)
188 sleepingtime = sleep (sleepingtime);
196 int start_server (void)
205 if (multicast_receive (&host, &type, &instance, &values) == 0)
206 plugin_write (host, type, instance, values);
208 if (host != NULL) free (host); host = NULL;
209 if (type != NULL) free (type); type = NULL;
210 if (instance != NULL) free (instance); instance = NULL;
211 if (values != NULL) free (values); values = NULL;
216 #endif /* HAVE_LIBRRD */
218 int pidfile_create (char *file)
225 if ((fh = fopen (file, "w")) == NULL)
227 syslog (LOG_ERR, "fopen (%s): %s", file, strerror (errno));
231 fprintf (fh, "%d\n", getpid());
237 int pidfile_remove (void)
239 return (unlink (PIDFILE));
242 int main (int argc, char **argv)
244 struct sigaction sigIntAction, sigChldAction;
249 char *configfile = CONFIGFILE;
250 char *pidfile = PIDFILE;
251 char *plugindir = PLUGINDIR;
252 char *datadir = PKGLOCALSTATEDIR;
257 operating_mode = MODE_LOCAL;
261 openlog (PACKAGE, LOG_CONS | LOG_PID, LOG_DAEMON);
268 c = getopt (argc, argv, "C:P:M:D:fh"
271 #endif /* HAVE_LIBRRD */
274 #endif /* COLLECT_PING */
284 operating_mode = MODE_CLIENT;
288 operating_mode = MODE_SERVER;
292 operating_mode = MODE_LOCAL;
294 #endif /* HAVE_LIBRRD */
312 if (num_pinghosts < MAX_PINGHOSTS)
313 pinghosts[num_pinghosts++] = optarg;
315 fprintf (stderr, "Maximum of %i ping hosts reached.\n", MAX_PINGHOSTS);
317 #endif /* COLLECT_PING */
320 exit_usage (argv[0]);
326 * Read the config file. This will load any modules automagically.
328 plugin_set_dir (plugindir);
330 if (cf_read (configfile))
332 fprintf (stderr, "Error: Reading the config file failed!\n"
333 "Read the syslog for details.\n");
338 * Change directory. We do this _after_ reading the config and loading
339 * modules to relative paths work as expected.
341 if (change_basedir (datadir))
343 fprintf (stderr, "Error: Unable to change to directory `%s'.\n", datadir);
348 * install signal handlers
350 sigIntAction.sa_handler = sigIntHandler;
351 sigaction (SIGINT, &sigIntAction, NULL);
353 sigChldAction.sa_handler = SIG_IGN;
354 sigaction (SIGCHLD, &sigChldAction, NULL);
362 if ((pid = fork ()) == -1)
365 fprintf (stderr, "fork: %s", strerror (errno));
371 /* printf ("Running (PID %i)\n", pid); */
375 /* Detach from session */
379 if (pidfile_create (pidfile))
382 /* close standard descriptors */
387 if (open ("/dev/null", O_RDWR) != 0)
389 syslog (LOG_ERR, "Error: Could not connect `STDIN' to `/dev/null'");
394 syslog (LOG_ERR, "Error: Could not connect `STDOUT' to `/dev/null'");
399 syslog (LOG_ERR, "Error: Could not connect `STDERR' to `/dev/null'");
402 } /* if (daemonize) */
403 #endif /* COLLECT_DAEMON */
406 * run the actual loops
409 if (operating_mode == MODE_SERVER)
411 else /* if (operating_mode == MODE_CLIENT || operating_mode == MODE_LOCAL) */
416 syslog (LOG_INFO, "Exiting normally");