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>
26 #include <sys/types.h>
27 #include <sys/socket.h>
33 #include "configfile.h"
36 # include <statgrab.h>
42 char hostname_g[DATA_MAX_NAME_LEN];
47 #endif /* HAVE_LIBKSTAT */
51 static void *do_flush (void __attribute__((unused)) *arg)
53 INFO ("Flushing all data.");
54 plugin_flush (/* plugin = */ NULL,
57 INFO ("Finished flushing all data.");
62 static void sig_int_handler (int __attribute__((unused)) signal)
67 static void sig_term_handler (int __attribute__((unused)) signal)
72 static void sig_usr1_handler (int __attribute__((unused)) signal)
77 /* flushing the data might take a while,
78 * so it should be done asynchronously */
79 pthread_attr_init (&attr);
80 pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
81 pthread_create (&thread, &attr, do_flush, NULL);
82 pthread_attr_destroy (&attr);
85 static int init_hostname (void)
89 struct addrinfo ai_hints;
90 struct addrinfo *ai_list;
91 struct addrinfo *ai_ptr;
94 str = global_option_get ("Hostname");
97 sstrncpy (hostname_g, str, sizeof (hostname_g));
101 if (gethostname (hostname_g, sizeof (hostname_g)) != 0)
103 fprintf (stderr, "`gethostname' failed and no "
104 "hostname was configured.\n");
108 str = global_option_get ("FQDNLookup");
112 memset (&ai_hints, '\0', sizeof (ai_hints));
113 ai_hints.ai_flags = AI_CANONNAME;
115 status = getaddrinfo (hostname_g, NULL, &ai_hints, &ai_list);
118 ERROR ("Looking up \"%s\" failed. You have set the "
119 "\"FQDNLookup\" option, but I cannot resolve "
120 "my hostname to a fully qualified domain "
121 "name. Please fix the network "
122 "configuration.", hostname_g);
126 for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
128 if (ai_ptr->ai_canonname == NULL)
131 sstrncpy (hostname_g, ai_ptr->ai_canonname, sizeof (hostname_g));
135 freeaddrinfo (ai_list);
137 } /* int init_hostname */
139 static int init_global_variables (void)
143 interval_g = cf_get_default_interval ();
144 assert (interval_g > 0);
145 DEBUG ("interval_g = %.3f;", CDTIME_T_TO_DOUBLE (interval_g));
147 str = global_option_get ("Timeout");
150 timeout_g = atoi (str);
153 fprintf (stderr, "Cannot set the timeout to a correct value.\n"
154 "Please check your settings.\n");
157 DEBUG ("timeout_g = %i;", timeout_g);
159 if (init_hostname () != 0)
161 DEBUG ("hostname_g = %s;", hostname_g);
164 } /* int init_global_variables */
166 static int change_basedir (const char *orig_dir)
172 dir = strdup (orig_dir);
176 ERROR ("strdup failed: %s",
177 sstrerror (errno, errbuf, sizeof (errbuf)));
181 dirlen = strlen (dir);
182 while ((dirlen > 0) && (dir[dirlen - 1] == '/'))
183 dir[--dirlen] = '\0';
190 status = chdir (dir);
196 else if (errno != ENOENT)
199 ERROR ("change_basedir: chdir (%s): %s", dir,
200 sstrerror (errno, errbuf, sizeof (errbuf)));
205 status = mkdir (dir, S_IRWXU | S_IRWXG | S_IRWXO);
209 ERROR ("change_basedir: mkdir (%s): %s", dir,
210 sstrerror (errno, errbuf, sizeof (errbuf)));
215 status = chdir (dir);
219 ERROR ("change_basedir: chdir (%s): %s", dir,
220 sstrerror (errno, errbuf, sizeof (errbuf)));
227 } /* static int change_basedir (char *dir) */
230 static void update_kstat (void)
234 if ((kc = kstat_open ()) == NULL)
235 ERROR ("Unable to open kstat control structure");
240 kid = kstat_chain_update (kc);
243 INFO ("kstat chain has been updated");
247 ERROR ("kstat chain update failed");
248 /* else: everything works as expected */
252 } /* static void update_kstat (void) */
253 #endif /* HAVE_LIBKSTAT */
256 * Remove all settings but `-f' and `-C'
258 static void exit_usage (int status)
260 printf ("Usage: "PACKAGE" [OPTIONS]\n\n"
262 "Available options:\n"
264 " -C <file> Configuration file.\n"
265 " Default: "CONFIGFILE"\n"
266 " -t Test config and exit.\n"
267 " -T Test plugin read and exit.\n"
268 " -P <file> PID-file.\n"
269 " Default: "PIDFILE"\n"
271 " -f Don't fork to the background.\n"
273 " -h Display help (this message)\n"
274 "\nBuiltin defaults:\n"
275 " Config file "CONFIGFILE"\n"
276 " PID file "PIDFILE"\n"
277 " Plugin directory "PLUGINDIR"\n"
278 " Data directory "PKGLOCALSTATEDIR"\n"
279 "\n"PACKAGE" "VERSION", http://collectd.org/\n"
280 "by Florian octo Forster <octo@verplant.org>\n"
281 "for contributions see `AUTHORS'\n");
283 } /* static void exit_usage (int status) */
285 static int do_init (void)
295 ERROR ("sg_init: %s", sg_str_error (sg_get_error ()));
299 if (sg_drop_privileges ())
301 ERROR ("sg_drop_privileges: %s", sg_str_error (sg_get_error ()));
309 } /* int do_init () */
312 static int do_loop (void)
314 cdtime_t interval = cf_get_default_interval ();
317 wait_until = cdtime () + interval;
321 struct timespec ts_wait = { 0, 0 };
328 /* Issue all plugins */
332 if (now >= wait_until)
334 WARNING ("Not sleeping because the next interval is "
335 "%.3f seconds in the past!",
336 CDTIME_T_TO_DOUBLE (now - wait_until));
337 wait_until = now + interval;
341 CDTIME_T_TO_TIMESPEC (wait_until - now, &ts_wait);
342 wait_until = wait_until + interval;
344 while ((loop == 0) && (nanosleep (&ts_wait, &ts_wait) != 0))
349 ERROR ("nanosleep failed: %s",
350 sstrerror (errno, errbuf,
355 } /* while (loop == 0) */
360 static int do_shutdown (void)
362 plugin_shutdown_all ();
364 } /* int do_shutdown */
367 static int pidfile_create (void)
370 const char *file = global_option_get ("PIDFile");
372 if ((fh = fopen (file, "w")) == NULL)
375 ERROR ("fopen (%s): %s", file,
376 sstrerror (errno, errbuf, sizeof (errbuf)));
380 fprintf (fh, "%i\n", (int) getpid ());
384 } /* static int pidfile_create (const char *file) */
386 static int pidfile_remove (void)
388 const char *file = global_option_get ("PIDFile");
392 return (unlink (file));
393 } /* static int pidfile_remove (const char *file) */
394 #endif /* COLLECT_DAEMON */
396 int main (int argc, char **argv)
398 struct sigaction sig_int_action;
399 struct sigaction sig_term_action;
400 struct sigaction sig_usr1_action;
401 struct sigaction sig_pipe_action;
402 char *configfile = CONFIGFILE;
404 int test_readall = 0;
407 struct sigaction sig_chld_action;
418 c = getopt (argc, argv, "htTC:"
437 global_option_set ("ReadThreads", "-1");
440 #endif /* COLLECT_DAEMON */
444 global_option_set ("PIDFile", optarg);
449 #endif /* COLLECT_DAEMON */
464 * Read options from the config file, the environment and the command
465 * line (in that order, with later options overwriting previous ones in
467 * Also, this will automatically load modules.
469 if (cf_read (configfile))
471 fprintf (stderr, "Error: Reading the config file failed!\n"
472 "Read the syslog for details.\n");
477 * Change directory. We do this _after_ reading the config and loading
478 * modules to relative paths work as expected.
480 if ((basedir = global_option_get ("BaseDir")) == NULL)
482 fprintf (stderr, "Don't have a basedir to use. This should not happen. Ever.");
485 else if (change_basedir (basedir))
487 fprintf (stderr, "Error: Unable to change to directory `%s'.\n", basedir);
492 * Set global variables or, if that failes, exit. We cannot run with
493 * them being uninitialized. If nothing is configured, then defaults
494 * are being used. So this means that the user has actually done
497 if (init_global_variables () != 0)
507 memset (&sig_chld_action, '\0', sizeof (sig_chld_action));
508 sig_chld_action.sa_handler = SIG_IGN;
509 sigaction (SIGCHLD, &sig_chld_action, NULL);
513 if ((pid = fork ()) == -1)
517 fprintf (stderr, "fork: %s",
518 sstrerror (errno, errbuf,
525 /* printf ("Running (PID %i)\n", pid); */
529 /* Detach from session */
533 if (pidfile_create ())
536 /* close standard descriptors */
541 if (open ("/dev/null", O_RDWR) != 0)
543 ERROR ("Error: Could not connect `STDIN' to `/dev/null'");
548 ERROR ("Error: Could not connect `STDOUT' to `/dev/null'");
553 ERROR ("Error: Could not connect `STDERR' to `/dev/null'");
556 } /* if (daemonize) */
557 #endif /* COLLECT_DAEMON */
559 memset (&sig_pipe_action, '\0', sizeof (sig_pipe_action));
560 sig_pipe_action.sa_handler = SIG_IGN;
561 sigaction (SIGPIPE, &sig_pipe_action, NULL);
564 * install signal handlers
566 memset (&sig_int_action, '\0', sizeof (sig_int_action));
567 sig_int_action.sa_handler = sig_int_handler;
568 if (0 != sigaction (SIGINT, &sig_int_action, NULL)) {
570 ERROR ("Error: Failed to install a signal handler for signal INT: %s",
571 sstrerror (errno, errbuf, sizeof (errbuf)));
575 memset (&sig_term_action, '\0', sizeof (sig_term_action));
576 sig_term_action.sa_handler = sig_term_handler;
577 if (0 != sigaction (SIGTERM, &sig_term_action, NULL)) {
579 ERROR ("Error: Failed to install a signal handler for signal TERM: %s",
580 sstrerror (errno, errbuf, sizeof (errbuf)));
584 memset (&sig_usr1_action, '\0', sizeof (sig_usr1_action));
585 sig_usr1_action.sa_handler = sig_usr1_handler;
586 if (0 != sigaction (SIGUSR1, &sig_usr1_action, NULL)) {
588 ERROR ("Error: Failed to install a signal handler for signal USR1: %s",
589 sstrerror (errno, errbuf, sizeof (errbuf)));
594 * run the actual loops
600 if (plugin_read_all_once () != 0)
605 INFO ("Initialization complete, entering read-loop.");
610 INFO ("Exiting normally.");
617 #endif /* COLLECT_DAEMON */
619 return (exit_status);