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 you 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 str = global_option_get ("Interval");
146 interval_g = TIME_T_TO_CDTIME_T (10);
155 fprintf (stderr, "Cannot set the interval to a "
157 "Please check your settings.\n");
161 interval_g = DOUBLE_TO_CDTIME_T (tmp);
163 DEBUG ("interval_g = %.3f;", CDTIME_T_TO_DOUBLE (interval_g));
165 str = global_option_get ("Timeout");
168 timeout_g = atoi (str);
171 fprintf (stderr, "Cannot set the timeout to a correct value.\n"
172 "Please check your settings.\n");
175 DEBUG ("timeout_g = %i;", timeout_g);
177 if (init_hostname () != 0)
179 DEBUG ("hostname_g = %s;", hostname_g);
182 } /* int init_global_variables */
184 static int change_basedir (const char *orig_dir)
190 dir = strdup (orig_dir);
194 ERROR ("strdup failed: %s",
195 sstrerror (errno, errbuf, sizeof (errbuf)));
199 dirlen = strlen (dir);
200 while ((dirlen > 0) && (dir[dirlen - 1] == '/'))
201 dir[--dirlen] = '\0';
206 status = chdir (dir);
212 else if (errno != ENOENT)
215 ERROR ("change_basedir: chdir (%s): %s", dir,
216 sstrerror (errno, errbuf, sizeof (errbuf)));
221 status = mkdir (dir, S_IRWXU | S_IRWXG | S_IRWXO);
225 ERROR ("change_basedir: mkdir (%s): %s", dir,
226 sstrerror (errno, errbuf, sizeof (errbuf)));
231 status = chdir (dir);
235 ERROR ("change_basedir: chdir (%s): %s", dir,
236 sstrerror (errno, errbuf, sizeof (errbuf)));
243 } /* static int change_basedir (char *dir) */
246 static void update_kstat (void)
250 if ((kc = kstat_open ()) == NULL)
251 ERROR ("Unable to open kstat control structure");
256 kid = kstat_chain_update (kc);
259 INFO ("kstat chain has been updated");
263 ERROR ("kstat chain update failed");
264 /* else: everything works as expected */
268 } /* static void update_kstat (void) */
269 #endif /* HAVE_LIBKSTAT */
272 * Remove all settings but `-f' and `-C'
274 static void exit_usage (int status)
276 printf ("Usage: "PACKAGE" [OPTIONS]\n\n"
278 "Available options:\n"
280 " -C <file> Configuration file.\n"
281 " Default: "CONFIGFILE"\n"
282 " -t Test config and exit.\n"
283 " -T Test plugin read and exit.\n"
284 " -P <file> PID-file.\n"
285 " Default: "PIDFILE"\n"
287 " -f Don't fork to the background.\n"
289 " -h Display help (this message)\n"
290 "\nBuiltin defaults:\n"
291 " Config file "CONFIGFILE"\n"
292 " PID file "PIDFILE"\n"
293 " Plugin directory "PLUGINDIR"\n"
294 " Data directory "PKGLOCALSTATEDIR"\n"
295 "\n"PACKAGE" "VERSION", http://collectd.org/\n"
296 "by Florian octo Forster <octo@verplant.org>\n"
297 "for contributions see `AUTHORS'\n");
299 } /* static void exit_usage (int status) */
301 static int do_init (void)
311 ERROR ("sg_init: %s", sg_str_error (sg_get_error ()));
315 if (sg_drop_privileges ())
317 ERROR ("sg_drop_privileges: %s", sg_str_error (sg_get_error ()));
325 } /* int do_init () */
328 static int do_loop (void)
332 wait_until = cdtime () + interval_g;
336 struct timespec ts_wait = { 0, 0 };
343 /* Issue all plugins */
347 if (now >= wait_until)
349 WARNING ("Not sleeping because the next interval is "
350 "%.3f seconds in the past!",
351 CDTIME_T_TO_DOUBLE (now - wait_until));
352 wait_until = now + interval_g;
356 CDTIME_T_TO_TIMESPEC (wait_until - now, &ts_wait);
357 wait_until = wait_until + interval_g;
359 while ((loop == 0) && (nanosleep (&ts_wait, &ts_wait) != 0))
364 ERROR ("nanosleep failed: %s",
365 sstrerror (errno, errbuf,
370 } /* while (loop == 0) */
375 static int do_shutdown (void)
377 plugin_shutdown_all ();
379 } /* int do_shutdown */
382 static int pidfile_create (void)
385 const char *file = global_option_get ("PIDFile");
387 if ((fh = fopen (file, "w")) == NULL)
390 ERROR ("fopen (%s): %s", file,
391 sstrerror (errno, errbuf, sizeof (errbuf)));
395 fprintf (fh, "%i\n", (int) getpid ());
399 } /* static int pidfile_create (const char *file) */
401 static int pidfile_remove (void)
403 const char *file = global_option_get ("PIDFile");
405 DEBUG ("unlink (%s)", (file != NULL) ? file : "<null>");
406 return (unlink (file));
407 } /* static int pidfile_remove (const char *file) */
408 #endif /* COLLECT_DAEMON */
410 int main (int argc, char **argv)
412 struct sigaction sig_int_action;
413 struct sigaction sig_term_action;
414 struct sigaction sig_usr1_action;
415 struct sigaction sig_pipe_action;
416 char *configfile = CONFIGFILE;
418 int test_readall = 0;
421 struct sigaction sig_chld_action;
432 c = getopt (argc, argv, "htTC:"
451 global_option_set ("ReadThreads", "-1");
454 #endif /* COLLECT_DAEMON */
458 global_option_set ("PIDFile", optarg);
463 #endif /* COLLECT_DAEMON */
476 * Read options from the config file, the environment and the command
477 * line (in that order, with later options overwriting previous ones in
479 * Also, this will automatically load modules.
481 if (cf_read (configfile))
483 fprintf (stderr, "Error: Reading the config file failed!\n"
484 "Read the syslog for details.\n");
489 * Change directory. We do this _after_ reading the config and loading
490 * modules to relative paths work as expected.
492 if ((basedir = global_option_get ("BaseDir")) == NULL)
494 fprintf (stderr, "Don't have a basedir to use. This should not happen. Ever.");
497 else if (change_basedir (basedir))
499 fprintf (stderr, "Error: Unable to change to directory `%s'.\n", basedir);
504 * Set global variables or, if that failes, exit. We cannot run with
505 * them being uninitialized. If nothing is configured, then defaults
506 * are being used. So this means that the user has actually done
509 if (init_global_variables () != 0)
519 memset (&sig_chld_action, '\0', sizeof (sig_chld_action));
520 sig_chld_action.sa_handler = SIG_IGN;
521 sigaction (SIGCHLD, &sig_chld_action, NULL);
525 if ((pid = fork ()) == -1)
529 fprintf (stderr, "fork: %s",
530 sstrerror (errno, errbuf,
537 /* printf ("Running (PID %i)\n", pid); */
541 /* Detach from session */
545 if (pidfile_create ())
548 /* close standard descriptors */
553 if (open ("/dev/null", O_RDWR) != 0)
555 ERROR ("Error: Could not connect `STDIN' to `/dev/null'");
560 ERROR ("Error: Could not connect `STDOUT' to `/dev/null'");
565 ERROR ("Error: Could not connect `STDERR' to `/dev/null'");
568 } /* if (daemonize) */
569 #endif /* COLLECT_DAEMON */
571 memset (&sig_pipe_action, '\0', sizeof (sig_pipe_action));
572 sig_pipe_action.sa_handler = SIG_IGN;
573 sigaction (SIGPIPE, &sig_pipe_action, NULL);
576 * install signal handlers
578 memset (&sig_int_action, '\0', sizeof (sig_int_action));
579 sig_int_action.sa_handler = sig_int_handler;
580 if (0 != sigaction (SIGINT, &sig_int_action, NULL)) {
582 ERROR ("Error: Failed to install a signal handler for signal INT: %s",
583 sstrerror (errno, errbuf, sizeof (errbuf)));
587 memset (&sig_term_action, '\0', sizeof (sig_term_action));
588 sig_term_action.sa_handler = sig_term_handler;
589 if (0 != sigaction (SIGTERM, &sig_term_action, NULL)) {
591 ERROR ("Error: Failed to install a signal handler for signal TERM: %s",
592 sstrerror (errno, errbuf, sizeof (errbuf)));
596 memset (&sig_usr1_action, '\0', sizeof (sig_usr1_action));
597 sig_usr1_action.sa_handler = sig_usr1_handler;
598 if (0 != sigaction (SIGUSR1, &sig_usr1_action, NULL)) {
600 ERROR ("Error: Failed to install a signal handler for signal USR1: %s",
601 sstrerror (errno, errbuf, sizeof (errbuf)));
606 * run the actual loops
612 if (plugin_read_all_once () != 0)
617 INFO ("Initialization complete, entering read-loop.");
622 INFO ("Exiting normally.");
629 #endif /* COLLECT_DAEMON */
631 return (exit_status);