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);
94 ERROR ("strdup failed: %s", strerror (errno));
98 dirlen = strlen (dir);
99 while ((dirlen > 0) && (dir[dirlen - 1] == '/'))
100 dir[--dirlen] = '\0';
105 status = chdir (dir);
112 if (mkdir (orig_dir, 0755) == -1)
114 ERROR ("mkdir (%s): %s", orig_dir,
118 else if (chdir (orig_dir) == -1)
120 ERROR ("chdir (%s): %s", orig_dir,
127 ERROR ("chdir (%s): %s", orig_dir,
134 } /* static int change_basedir (char *dir) */
137 static void update_kstat (void)
141 if ((kc = kstat_open ()) == NULL)
142 ERROR ("Unable to open kstat control structure");
147 kid = kstat_chain_update (kc);
150 INFO ("kstat chain has been updated");
154 ERROR ("kstat chain update failed");
155 /* else: everything works as expected */
159 } /* static void update_kstat (void) */
160 #endif /* HAVE_LIBKSTAT */
163 * Remove all settings but `-f' and `-C'
165 static void exit_usage (char *name)
167 printf ("Usage: "PACKAGE" [OPTIONS]\n\n"
169 "Available options:\n"
171 " -C <file> Configuration file.\n"
172 " Default: "CONFIGFILE"\n"
173 " -P <file> PID-file.\n"
174 " Default: "PIDFILE"\n"
176 " -f Don't fork to the background.\n"
178 "\nBuiltin defaults:\n"
179 " Config-File "CONFIGFILE"\n"
180 " PID-File "PIDFILE"\n"
181 " Data-Directory "PKGLOCALSTATEDIR"\n"
183 " Log-File "LOGFILE"\n"
185 " Step "COLLECTD_STEP" seconds\n"
186 " Heartbeat "COLLECTD_HEARTBEAT" seconds\n"
187 "\n"PACKAGE" "VERSION", http://collectd.org/\n"
188 "by Florian octo Forster <octo@verplant.org>\n"
189 "for contributions see `AUTHORS'\n");
191 } /* static void exit_usage (char *name) */
193 static int do_init (void)
203 ERROR ("sg_init: %s", sg_str_error (sg_get_error ()));
207 if (sg_drop_privileges ())
209 ERROR ("sg_drop_privileges: %s", sg_str_error (sg_get_error ()));
217 } /* int do_init () */
220 static int do_loop (void)
222 struct timeval tv_now;
223 struct timeval tv_next;
224 struct timespec ts_wait;
228 if (gettimeofday (&tv_next, NULL) < 0)
230 ERROR ("gettimeofday failed: %s", strerror (errno));
233 tv_next.tv_sec += interval_g;
239 /* Issue all plugins */
240 plugin_read_all (&loop);
242 if (gettimeofday (&tv_now, NULL) < 0)
244 ERROR ("gettimeofday failed: %s",
249 if (timeval_sub_timespec (&tv_next, &tv_now, &ts_wait) != 0)
251 WARNING ("Not sleeping because "
252 "`timeval_sub_timespec' returned "
257 while ((loop == 0) && (nanosleep (&ts_wait, &ts_wait) == -1))
261 ERROR ("nanosleep failed: %s", strerror (errno));
265 } /* while (loop == 0) */
267 DEBUG ("return (0);");
271 static int do_shutdown (void)
273 plugin_shutdown_all ();
275 } /* int do_shutdown */
278 static int pidfile_create (void)
281 const char *file = global_option_get ("PIDFile");
283 if ((fh = fopen (file, "w")) == NULL)
285 ERROR ("fopen (%s): %s", file, strerror (errno));
289 fprintf (fh, "%i\n", (int) getpid ());
293 } /* static int pidfile_create (const char *file) */
295 static int pidfile_remove (void)
297 const char *file = global_option_get ("PIDFile");
299 DEBUG ("unlink (%s)", (file != NULL) ? file : "<null>");
300 return (unlink (file));
301 } /* static int pidfile_remove (const char *file) */
302 #endif /* COLLECT_DAEMON */
304 int main (int argc, char **argv)
306 struct sigaction sigIntAction;
307 struct sigaction sigTermAction;
308 char *configfile = CONFIGFILE;
311 struct sigaction sigChldAction;
321 c = getopt (argc, argv, "hC:"
337 global_option_set ("PIDFile", optarg);
342 #endif /* COLLECT_DAEMON */
345 exit_usage (argv[0]);
350 * Read options from the config file, the environment and the command
351 * line (in that order, with later options overwriting previous ones in
353 * Also, this will automatically load modules.
355 if (cf_read (configfile))
357 fprintf (stderr, "Error: Reading the config file failed!\n"
358 "Read the syslog for details.\n");
363 * Change directory. We do this _after_ reading the config and loading
364 * modules to relative paths work as expected.
366 if ((basedir = global_option_get ("BaseDir")) == NULL)
368 fprintf (stderr, "Don't have a basedir to use. This should not happen. Ever.");
371 else if (change_basedir (basedir))
373 fprintf (stderr, "Error: Unable to change to directory `%s'.\n", basedir);
378 * Set global variables or, if that failes, exit. We cannot run with
379 * them being uninitialized. If nothing is configured, then defaults
380 * are being used. So this means that the user has actually done
383 if (init_global_variables () != 0)
390 memset (&sigChldAction, '\0', sizeof (sigChldAction));
391 sigChldAction.sa_handler = SIG_IGN;
392 sigaction (SIGCHLD, &sigChldAction, NULL);
396 if ((pid = fork ()) == -1)
399 fprintf (stderr, "fork: %s", strerror (errno));
405 /* printf ("Running (PID %i)\n", pid); */
409 /* Detach from session */
413 if (pidfile_create ())
416 /* close standard descriptors */
421 if (open ("/dev/null", O_RDWR) != 0)
423 ERROR ("Error: Could not connect `STDIN' to `/dev/null'");
428 ERROR ("Error: Could not connect `STDOUT' to `/dev/null'");
433 ERROR ("Error: Could not connect `STDERR' to `/dev/null'");
436 } /* if (daemonize) */
437 #endif /* COLLECT_DAEMON */
440 * install signal handlers
442 memset (&sigIntAction, '\0', sizeof (sigIntAction));
443 sigIntAction.sa_handler = sigIntHandler;
444 sigaction (SIGINT, &sigIntAction, NULL);
446 memset (&sigTermAction, '\0', sizeof (sigTermAction));
447 sigTermAction.sa_handler = sigTermHandler;
448 sigaction (SIGTERM, &sigTermAction, NULL);
451 * run the actual loops
457 INFO ("Exiting normally");
464 #endif /* COLLECT_DAEMON */