2 * collectd - src/collectd.c
3 * Copyright (C) 2005-2007 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; only version 2 of the License is applicable.
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
19 * Florian octo Forster <octo at verplant.org>
20 * Alvaro Barcellos <alvaro.barcellos at gmail.com>
28 #include "configfile.h"
33 char hostname_g[DATA_MAX_NAME_LEN];
37 #endif /* HAVE_LIBKSTAT */
41 static void sigIntHandler (int signal)
46 static void sigTermHandler (int signal)
51 static int init_global_variables (void)
55 str = global_option_get ("Hostname");
58 strncpy (hostname_g, str, sizeof (hostname_g));
62 if (gethostname (hostname_g, sizeof (hostname_g)) != 0)
64 fprintf (stderr, "`gethostname' failed and no "
65 "hostname was configured.\n");
69 DEBUG ("hostname_g = %s;", hostname_g);
71 str = global_option_get ("Interval");
74 interval_g = atoi (str);
77 fprintf (stderr, "Cannot set the interval to a correct value.\n"
78 "Please check your settings.\n");
81 DEBUG ("interval_g = %i;", interval_g);
84 } /* int init_global_variables */
86 static int change_basedir (const char *orig_dir)
88 char *dir = strdup (orig_dir);
95 ERROR ("strdup failed: %s",
96 sstrerror (errno, errbuf, sizeof (errbuf)));
100 dirlen = strlen (dir);
101 while ((dirlen > 0) && (dir[dirlen - 1] == '/'))
102 dir[--dirlen] = '\0';
107 status = chdir (dir);
114 if (mkdir (orig_dir, 0755) == -1)
117 ERROR ("mkdir (%s): %s", orig_dir,
118 sstrerror (errno, errbuf,
122 else if (chdir (orig_dir) == -1)
125 ERROR ("chdir (%s): %s", orig_dir,
126 sstrerror (errno, errbuf,
134 ERROR ("chdir (%s): %s", orig_dir,
135 sstrerror (errno, errbuf,
142 } /* static int change_basedir (char *dir) */
145 static void update_kstat (void)
149 if ((kc = kstat_open ()) == NULL)
150 ERROR ("Unable to open kstat control structure");
155 kid = kstat_chain_update (kc);
158 INFO ("kstat chain has been updated");
162 ERROR ("kstat chain update failed");
163 /* else: everything works as expected */
167 } /* static void update_kstat (void) */
168 #endif /* HAVE_LIBKSTAT */
171 * Remove all settings but `-f' and `-C'
173 static void exit_usage (char *name)
175 printf ("Usage: "PACKAGE" [OPTIONS]\n\n"
177 "Available options:\n"
179 " -C <file> Configuration file.\n"
180 " Default: "CONFIGFILE"\n"
181 " -P <file> PID-file.\n"
182 " Default: "PIDFILE"\n"
184 " -f Don't fork to the background.\n"
186 "\nBuiltin defaults:\n"
187 " Config-File "CONFIGFILE"\n"
188 " PID-File "PIDFILE"\n"
189 " Data-Directory "PKGLOCALSTATEDIR"\n"
191 " Log-File "LOGFILE"\n"
193 " Step "COLLECTD_STEP" seconds\n"
194 " Heartbeat "COLLECTD_HEARTBEAT" seconds\n"
195 "\n"PACKAGE" "VERSION", http://collectd.org/\n"
196 "by Florian octo Forster <octo@verplant.org>\n"
197 "for contributions see `AUTHORS'\n");
199 } /* static void exit_usage (char *name) */
201 static int do_init (void)
211 ERROR ("sg_init: %s", sg_str_error (sg_get_error ()));
215 if (sg_drop_privileges ())
217 ERROR ("sg_drop_privileges: %s", sg_str_error (sg_get_error ()));
225 } /* int do_init () */
228 static int do_loop (void)
230 struct timeval tv_now;
231 struct timeval tv_next;
232 struct timespec ts_wait;
236 if (gettimeofday (&tv_next, NULL) < 0)
239 ERROR ("gettimeofday failed: %s",
240 sstrerror (errno, errbuf,
244 tv_next.tv_sec += interval_g;
250 /* Issue all plugins */
251 plugin_read_all (&loop);
253 if (gettimeofday (&tv_now, NULL) < 0)
256 ERROR ("gettimeofday failed: %s",
257 sstrerror (errno, errbuf,
262 if (timeval_sub_timespec (&tv_next, &tv_now, &ts_wait) != 0)
264 WARNING ("Not sleeping because "
265 "`timeval_sub_timespec' returned "
270 while ((loop == 0) && (nanosleep (&ts_wait, &ts_wait) == -1))
275 ERROR ("nanosleep failed: %s",
276 sstrerror (errno, errbuf,
281 } /* while (loop == 0) */
283 DEBUG ("return (0);");
287 static int do_shutdown (void)
289 plugin_shutdown_all ();
291 } /* int do_shutdown */
294 static int pidfile_create (void)
297 const char *file = global_option_get ("PIDFile");
299 if ((fh = fopen (file, "w")) == NULL)
302 ERROR ("fopen (%s): %s", file,
303 sstrerror (errno, errbuf, sizeof (errbuf)));
307 fprintf (fh, "%i\n", (int) getpid ());
311 } /* static int pidfile_create (const char *file) */
313 static int pidfile_remove (void)
315 const char *file = global_option_get ("PIDFile");
317 DEBUG ("unlink (%s)", (file != NULL) ? file : "<null>");
318 return (unlink (file));
319 } /* static int pidfile_remove (const char *file) */
320 #endif /* COLLECT_DAEMON */
322 int main (int argc, char **argv)
324 struct sigaction sigIntAction;
325 struct sigaction sigTermAction;
326 char *configfile = CONFIGFILE;
329 struct sigaction sigChldAction;
339 c = getopt (argc, argv, "hC:"
355 global_option_set ("PIDFile", optarg);
360 #endif /* COLLECT_DAEMON */
363 exit_usage (argv[0]);
368 * Read options from the config file, the environment and the command
369 * line (in that order, with later options overwriting previous ones in
371 * Also, this will automatically load modules.
373 if (cf_read (configfile))
375 fprintf (stderr, "Error: Reading the config file failed!\n"
376 "Read the syslog for details.\n");
381 * Change directory. We do this _after_ reading the config and loading
382 * modules to relative paths work as expected.
384 if ((basedir = global_option_get ("BaseDir")) == NULL)
386 fprintf (stderr, "Don't have a basedir to use. This should not happen. Ever.");
389 else if (change_basedir (basedir))
391 fprintf (stderr, "Error: Unable to change to directory `%s'.\n", basedir);
396 * Set global variables or, if that failes, exit. We cannot run with
397 * them being uninitialized. If nothing is configured, then defaults
398 * are being used. So this means that the user has actually done
401 if (init_global_variables () != 0)
408 memset (&sigChldAction, '\0', sizeof (sigChldAction));
409 sigChldAction.sa_handler = SIG_IGN;
410 sigaction (SIGCHLD, &sigChldAction, NULL);
414 if ((pid = fork ()) == -1)
418 fprintf (stderr, "fork: %s",
419 sstrerror (errno, errbuf,
426 /* printf ("Running (PID %i)\n", pid); */
430 /* Detach from session */
434 if (pidfile_create ())
437 /* close standard descriptors */
442 if (open ("/dev/null", O_RDWR) != 0)
444 ERROR ("Error: Could not connect `STDIN' to `/dev/null'");
449 ERROR ("Error: Could not connect `STDOUT' to `/dev/null'");
454 ERROR ("Error: Could not connect `STDERR' to `/dev/null'");
457 } /* if (daemonize) */
458 #endif /* COLLECT_DAEMON */
461 * install signal handlers
463 memset (&sigIntAction, '\0', sizeof (sigIntAction));
464 sigIntAction.sa_handler = sigIntHandler;
465 sigaction (SIGINT, &sigIntAction, NULL);
467 memset (&sigTermAction, '\0', sizeof (sigTermAction));
468 sigTermAction.sa_handler = sigTermHandler;
469 sigaction (SIGTERM, &sigTermAction, NULL);
472 * run the actual loops
478 INFO ("Exiting normally");
485 #endif /* COLLECT_DAEMON */