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 (NULL, -1, NULL);
55 INFO ("Finished flushing all data.");
60 static void sig_int_handler (int __attribute__((unused)) signal)
65 static void sig_term_handler (int __attribute__((unused)) signal)
70 static void sig_usr1_handler (int __attribute__((unused)) signal)
75 /* flushing the data might take a while,
76 * so it should be done asynchronously */
77 pthread_attr_init (&attr);
78 pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
79 pthread_create (&thread, &attr, do_flush, NULL);
82 static int init_hostname (void)
86 struct addrinfo ai_hints;
87 struct addrinfo *ai_list;
88 struct addrinfo *ai_ptr;
91 str = global_option_get ("Hostname");
94 sstrncpy (hostname_g, str, sizeof (hostname_g));
98 if (gethostname (hostname_g, sizeof (hostname_g)) != 0)
100 fprintf (stderr, "`gethostname' failed and no "
101 "hostname was configured.\n");
105 str = global_option_get ("FQDNLookup");
109 memset (&ai_hints, '\0', sizeof (ai_hints));
110 ai_hints.ai_flags = AI_CANONNAME;
112 status = getaddrinfo (hostname_g, NULL, &ai_hints, &ai_list);
115 ERROR ("Looking up \"%s\" failed. You have set the "
116 "\"FQDNLookup\" option, but I cannot resolve "
117 "my hostname to a fully qualified domain "
118 "name. Please fix you network "
119 "configuration.", hostname_g);
123 for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
125 if (ai_ptr->ai_canonname == NULL)
128 sstrncpy (hostname_g, ai_ptr->ai_canonname, sizeof (hostname_g));
132 freeaddrinfo (ai_list);
134 } /* int init_hostname */
136 static int init_global_variables (void)
140 str = global_option_get ("Interval");
143 interval_g = TIME_T_TO_CDTIME_T (10);
152 fprintf (stderr, "Cannot set the interval to a "
154 "Please check your settings.\n");
158 interval_g = DOUBLE_TO_CDTIME_T (tmp);
160 DEBUG ("interval_g = %.3f;", CDTIME_T_TO_DOUBLE (interval_g));
162 str = global_option_get ("Timeout");
165 timeout_g = atoi (str);
168 fprintf (stderr, "Cannot set the timeout to a correct value.\n"
169 "Please check your settings.\n");
172 DEBUG ("timeout_g = %i;", timeout_g);
174 if (init_hostname () != 0)
176 DEBUG ("hostname_g = %s;", hostname_g);
179 } /* int init_global_variables */
181 static int change_basedir (const char *orig_dir)
183 char *dir = strdup (orig_dir);
190 ERROR ("strdup failed: %s",
191 sstrerror (errno, errbuf, sizeof (errbuf)));
195 dirlen = strlen (dir);
196 while ((dirlen > 0) && (dir[dirlen - 1] == '/'))
197 dir[--dirlen] = '\0';
202 status = chdir (dir);
209 if (mkdir (orig_dir, 0755) == -1)
212 ERROR ("change_basedir: mkdir (%s): %s", orig_dir,
213 sstrerror (errno, errbuf,
217 else if (chdir (orig_dir) == -1)
220 ERROR ("chdir (%s): %s", orig_dir,
221 sstrerror (errno, errbuf,
229 ERROR ("chdir (%s): %s", orig_dir,
230 sstrerror (errno, errbuf,
237 } /* static int change_basedir (char *dir) */
240 static void update_kstat (void)
244 if ((kc = kstat_open ()) == NULL)
245 ERROR ("Unable to open kstat control structure");
250 kid = kstat_chain_update (kc);
253 INFO ("kstat chain has been updated");
257 ERROR ("kstat chain update failed");
258 /* else: everything works as expected */
262 } /* static void update_kstat (void) */
263 #endif /* HAVE_LIBKSTAT */
266 * Remove all settings but `-f' and `-C'
268 static void exit_usage (int status)
270 printf ("Usage: "PACKAGE" [OPTIONS]\n\n"
272 "Available options:\n"
274 " -C <file> Configuration file.\n"
275 " Default: "CONFIGFILE"\n"
276 " -t Test config and exit.\n"
277 " -T Test plugin read and exit.\n"
278 " -P <file> PID-file.\n"
279 " Default: "PIDFILE"\n"
281 " -f Don't fork to the background.\n"
283 " -h Display help (this message)\n"
284 "\nBuiltin defaults:\n"
285 " Config file "CONFIGFILE"\n"
286 " PID file "PIDFILE"\n"
287 " Plugin directory "PLUGINDIR"\n"
288 " Data directory "PKGLOCALSTATEDIR"\n"
289 "\n"PACKAGE" "VERSION", http://collectd.org/\n"
290 "by Florian octo Forster <octo@verplant.org>\n"
291 "for contributions see `AUTHORS'\n");
293 } /* static void exit_usage (int status) */
295 static int do_init (void)
305 ERROR ("sg_init: %s", sg_str_error (sg_get_error ()));
309 if (sg_drop_privileges ())
311 ERROR ("sg_drop_privileges: %s", sg_str_error (sg_get_error ()));
319 } /* int do_init () */
322 static int do_loop (void)
326 wait_until = cdtime () + interval_g;
330 struct timespec ts_wait = { 0, 0 };
337 /* Issue all plugins */
341 if (now >= wait_until)
343 WARNING ("Not sleeping because the next interval is "
344 "%.3f seconds in the past!",
345 CDTIME_T_TO_DOUBLE (now - wait_until));
346 wait_until = now + interval_g;
350 CDTIME_T_TO_TIMESPEC (wait_until - now, &ts_wait);
351 wait_until = wait_until + interval_g;
353 while ((loop == 0) && (nanosleep (&ts_wait, &ts_wait) != 0))
358 ERROR ("nanosleep failed: %s",
359 sstrerror (errno, errbuf,
364 } /* while (loop == 0) */
369 static int do_shutdown (void)
371 plugin_shutdown_all ();
373 } /* int do_shutdown */
376 static int pidfile_create (void)
379 const char *file = global_option_get ("PIDFile");
381 if ((fh = fopen (file, "w")) == NULL)
384 ERROR ("fopen (%s): %s", file,
385 sstrerror (errno, errbuf, sizeof (errbuf)));
389 fprintf (fh, "%i\n", (int) getpid ());
393 } /* static int pidfile_create (const char *file) */
395 static int pidfile_remove (void)
397 const char *file = global_option_get ("PIDFile");
399 DEBUG ("unlink (%s)", (file != NULL) ? file : "<null>");
400 return (unlink (file));
401 } /* static int pidfile_remove (const char *file) */
402 #endif /* COLLECT_DAEMON */
404 int main (int argc, char **argv)
406 struct sigaction sig_int_action;
407 struct sigaction sig_term_action;
408 struct sigaction sig_usr1_action;
409 struct sigaction sig_pipe_action;
410 char *configfile = CONFIGFILE;
412 int test_readall = 0;
415 struct sigaction sig_chld_action;
426 c = getopt (argc, argv, "htTC:"
445 global_option_set ("ReadThreads", "-1");
448 #endif /* COLLECT_DAEMON */
452 global_option_set ("PIDFile", optarg);
457 #endif /* COLLECT_DAEMON */
470 * Read options from the config file, the environment and the command
471 * line (in that order, with later options overwriting previous ones in
473 * Also, this will automatically load modules.
475 if (cf_read (configfile))
477 fprintf (stderr, "Error: Reading the config file failed!\n"
478 "Read the syslog for details.\n");
483 * Change directory. We do this _after_ reading the config and loading
484 * modules to relative paths work as expected.
486 if ((basedir = global_option_get ("BaseDir")) == NULL)
488 fprintf (stderr, "Don't have a basedir to use. This should not happen. Ever.");
491 else if (change_basedir (basedir))
493 fprintf (stderr, "Error: Unable to change to directory `%s'.\n", basedir);
498 * Set global variables or, if that failes, exit. We cannot run with
499 * them being uninitialized. If nothing is configured, then defaults
500 * are being used. So this means that the user has actually done
503 if (init_global_variables () != 0)
513 memset (&sig_chld_action, '\0', sizeof (sig_chld_action));
514 sig_chld_action.sa_handler = SIG_IGN;
515 sigaction (SIGCHLD, &sig_chld_action, NULL);
519 if ((pid = fork ()) == -1)
523 fprintf (stderr, "fork: %s",
524 sstrerror (errno, errbuf,
531 /* printf ("Running (PID %i)\n", pid); */
535 /* Detach from session */
539 if (pidfile_create ())
542 /* close standard descriptors */
547 if (open ("/dev/null", O_RDWR) != 0)
549 ERROR ("Error: Could not connect `STDIN' to `/dev/null'");
554 ERROR ("Error: Could not connect `STDOUT' to `/dev/null'");
559 ERROR ("Error: Could not connect `STDERR' to `/dev/null'");
562 } /* if (daemonize) */
563 #endif /* COLLECT_DAEMON */
565 memset (&sig_pipe_action, '\0', sizeof (sig_pipe_action));
566 sig_pipe_action.sa_handler = SIG_IGN;
567 sigaction (SIGPIPE, &sig_pipe_action, NULL);
570 * install signal handlers
572 memset (&sig_int_action, '\0', sizeof (sig_int_action));
573 sig_int_action.sa_handler = sig_int_handler;
574 if (0 != sigaction (SIGINT, &sig_int_action, NULL)) {
576 ERROR ("Error: Failed to install a signal handler for signal INT: %s",
577 sstrerror (errno, errbuf, sizeof (errbuf)));
581 memset (&sig_term_action, '\0', sizeof (sig_term_action));
582 sig_term_action.sa_handler = sig_term_handler;
583 if (0 != sigaction (SIGTERM, &sig_term_action, NULL)) {
585 ERROR ("Error: Failed to install a signal handler for signal TERM: %s",
586 sstrerror (errno, errbuf, sizeof (errbuf)));
590 memset (&sig_usr1_action, '\0', sizeof (sig_usr1_action));
591 sig_usr1_action.sa_handler = sig_usr1_handler;
592 if (0 != sigaction (SIGUSR1, &sig_usr1_action, NULL)) {
594 ERROR ("Error: Failed to install a signal handler for signal USR1: %s",
595 sstrerror (errno, errbuf, sizeof (errbuf)));
600 * run the actual loops
606 if (plugin_read_all_once () != 0)
611 INFO ("Initialization complete, entering read-loop.");
616 INFO ("Exiting normally.");
623 #endif /* COLLECT_DAEMON */
625 return (exit_status);