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);
84 static int init_hostname (void)
88 struct addrinfo ai_hints;
89 struct addrinfo *ai_list;
90 struct addrinfo *ai_ptr;
93 str = global_option_get ("Hostname");
96 sstrncpy (hostname_g, str, sizeof (hostname_g));
100 if (gethostname (hostname_g, sizeof (hostname_g)) != 0)
102 fprintf (stderr, "`gethostname' failed and no "
103 "hostname was configured.\n");
107 str = global_option_get ("FQDNLookup");
111 memset (&ai_hints, '\0', sizeof (ai_hints));
112 ai_hints.ai_flags = AI_CANONNAME;
114 status = getaddrinfo (hostname_g, NULL, &ai_hints, &ai_list);
117 ERROR ("Looking up \"%s\" failed. You have set the "
118 "\"FQDNLookup\" option, but I cannot resolve "
119 "my hostname to a fully qualified domain "
120 "name. Please fix you network "
121 "configuration.", hostname_g);
125 for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
127 if (ai_ptr->ai_canonname == NULL)
130 sstrncpy (hostname_g, ai_ptr->ai_canonname, sizeof (hostname_g));
134 freeaddrinfo (ai_list);
136 } /* int init_hostname */
138 static int init_global_variables (void)
142 str = global_option_get ("Interval");
145 interval_g = TIME_T_TO_CDTIME_T (10);
154 fprintf (stderr, "Cannot set the interval to a "
156 "Please check your settings.\n");
160 interval_g = DOUBLE_TO_CDTIME_T (tmp);
162 DEBUG ("interval_g = %.3f;", CDTIME_T_TO_DOUBLE (interval_g));
164 str = global_option_get ("Timeout");
167 timeout_g = atoi (str);
170 fprintf (stderr, "Cannot set the timeout to a correct value.\n"
171 "Please check your settings.\n");
174 DEBUG ("timeout_g = %i;", timeout_g);
176 if (init_hostname () != 0)
178 DEBUG ("hostname_g = %s;", hostname_g);
181 } /* int init_global_variables */
183 static int change_basedir (const char *orig_dir)
189 dir = strdup (orig_dir);
193 ERROR ("strdup failed: %s",
194 sstrerror (errno, errbuf, sizeof (errbuf)));
198 dirlen = strlen (dir);
199 while ((dirlen > 0) && (dir[dirlen - 1] == '/'))
200 dir[--dirlen] = '\0';
205 status = chdir (dir);
211 else if (errno != ENOENT)
214 ERROR ("change_basedir: chdir (%s): %s", dir,
215 sstrerror (errno, errbuf, sizeof (errbuf)));
220 status = mkdir (dir, S_IRWXU | S_IRWXG | S_IRWXO);
224 ERROR ("change_basedir: mkdir (%s): %s", dir,
225 sstrerror (errno, errbuf, sizeof (errbuf)));
230 status = chdir (dir);
234 ERROR ("change_basedir: chdir (%s): %s", dir,
235 sstrerror (errno, errbuf, sizeof (errbuf)));
242 } /* static int change_basedir (char *dir) */
245 static void update_kstat (void)
249 if ((kc = kstat_open ()) == NULL)
250 ERROR ("Unable to open kstat control structure");
255 kid = kstat_chain_update (kc);
258 INFO ("kstat chain has been updated");
262 ERROR ("kstat chain update failed");
263 /* else: everything works as expected */
267 } /* static void update_kstat (void) */
268 #endif /* HAVE_LIBKSTAT */
271 * Remove all settings but `-f' and `-C'
273 static void exit_usage (int status)
275 printf ("Usage: "PACKAGE" [OPTIONS]\n\n"
277 "Available options:\n"
279 " -C <file> Configuration file.\n"
280 " Default: "CONFIGFILE"\n"
281 " -t Test config and exit.\n"
282 " -T Test plugin read and exit.\n"
283 " -P <file> PID-file.\n"
284 " Default: "PIDFILE"\n"
286 " -f Don't fork to the background.\n"
288 " -h Display help (this message)\n"
289 "\nBuiltin defaults:\n"
290 " Config file "CONFIGFILE"\n"
291 " PID file "PIDFILE"\n"
292 " Plugin directory "PLUGINDIR"\n"
293 " Data directory "PKGLOCALSTATEDIR"\n"
294 "\n"PACKAGE" "VERSION", http://collectd.org/\n"
295 "by Florian octo Forster <octo@verplant.org>\n"
296 "for contributions see `AUTHORS'\n");
298 } /* static void exit_usage (int status) */
300 static int do_init (void)
310 ERROR ("sg_init: %s", sg_str_error (sg_get_error ()));
314 if (sg_drop_privileges ())
316 ERROR ("sg_drop_privileges: %s", sg_str_error (sg_get_error ()));
324 } /* int do_init () */
327 static int do_loop (void)
331 wait_until = cdtime () + interval_g;
335 struct timespec ts_wait = { 0, 0 };
342 /* Issue all plugins */
346 if (now >= wait_until)
348 WARNING ("Not sleeping because the next interval is "
349 "%.3f seconds in the past!",
350 CDTIME_T_TO_DOUBLE (now - wait_until));
351 wait_until = now + interval_g;
355 CDTIME_T_TO_TIMESPEC (wait_until - now, &ts_wait);
356 wait_until = wait_until + interval_g;
358 while ((loop == 0) && (nanosleep (&ts_wait, &ts_wait) != 0))
363 ERROR ("nanosleep failed: %s",
364 sstrerror (errno, errbuf,
369 } /* while (loop == 0) */
374 static int do_shutdown (void)
376 plugin_shutdown_all ();
378 } /* int do_shutdown */
381 static int pidfile_create (void)
384 const char *file = global_option_get ("PIDFile");
386 if ((fh = fopen (file, "w")) == NULL)
389 ERROR ("fopen (%s): %s", file,
390 sstrerror (errno, errbuf, sizeof (errbuf)));
394 fprintf (fh, "%i\n", (int) getpid ());
398 } /* static int pidfile_create (const char *file) */
400 static int pidfile_remove (void)
402 const char *file = global_option_get ("PIDFile");
404 DEBUG ("unlink (%s)", (file != NULL) ? file : "<null>");
405 return (unlink (file));
406 } /* static int pidfile_remove (const char *file) */
407 #endif /* COLLECT_DAEMON */
409 int main (int argc, char **argv)
411 struct sigaction sig_int_action;
412 struct sigaction sig_term_action;
413 struct sigaction sig_usr1_action;
414 struct sigaction sig_pipe_action;
415 char *configfile = CONFIGFILE;
417 int test_readall = 0;
420 struct sigaction sig_chld_action;
431 c = getopt (argc, argv, "htTC:"
450 global_option_set ("ReadThreads", "-1");
453 #endif /* COLLECT_DAEMON */
457 global_option_set ("PIDFile", optarg);
462 #endif /* COLLECT_DAEMON */
475 * Read options from the config file, the environment and the command
476 * line (in that order, with later options overwriting previous ones in
478 * Also, this will automatically load modules.
480 if (cf_read (configfile))
482 fprintf (stderr, "Error: Reading the config file failed!\n"
483 "Read the syslog for details.\n");
488 * Change directory. We do this _after_ reading the config and loading
489 * modules to relative paths work as expected.
491 if ((basedir = global_option_get ("BaseDir")) == NULL)
493 fprintf (stderr, "Don't have a basedir to use. This should not happen. Ever.");
496 else if (change_basedir (basedir))
498 fprintf (stderr, "Error: Unable to change to directory `%s'.\n", basedir);
503 * Set global variables or, if that failes, exit. We cannot run with
504 * them being uninitialized. If nothing is configured, then defaults
505 * are being used. So this means that the user has actually done
508 if (init_global_variables () != 0)
518 memset (&sig_chld_action, '\0', sizeof (sig_chld_action));
519 sig_chld_action.sa_handler = SIG_IGN;
520 sigaction (SIGCHLD, &sig_chld_action, NULL);
524 if ((pid = fork ()) == -1)
528 fprintf (stderr, "fork: %s",
529 sstrerror (errno, errbuf,
536 /* printf ("Running (PID %i)\n", pid); */
540 /* Detach from session */
544 if (pidfile_create ())
547 /* close standard descriptors */
552 if (open ("/dev/null", O_RDWR) != 0)
554 ERROR ("Error: Could not connect `STDIN' to `/dev/null'");
559 ERROR ("Error: Could not connect `STDOUT' to `/dev/null'");
564 ERROR ("Error: Could not connect `STDERR' to `/dev/null'");
567 } /* if (daemonize) */
568 #endif /* COLLECT_DAEMON */
570 memset (&sig_pipe_action, '\0', sizeof (sig_pipe_action));
571 sig_pipe_action.sa_handler = SIG_IGN;
572 sigaction (SIGPIPE, &sig_pipe_action, NULL);
575 * install signal handlers
577 memset (&sig_int_action, '\0', sizeof (sig_int_action));
578 sig_int_action.sa_handler = sig_int_handler;
579 if (0 != sigaction (SIGINT, &sig_int_action, NULL)) {
581 ERROR ("Error: Failed to install a signal handler for signal INT: %s",
582 sstrerror (errno, errbuf, sizeof (errbuf)));
586 memset (&sig_term_action, '\0', sizeof (sig_term_action));
587 sig_term_action.sa_handler = sig_term_handler;
588 if (0 != sigaction (SIGTERM, &sig_term_action, NULL)) {
590 ERROR ("Error: Failed to install a signal handler for signal TERM: %s",
591 sstrerror (errno, errbuf, sizeof (errbuf)));
595 memset (&sig_usr1_action, '\0', sizeof (sig_usr1_action));
596 sig_usr1_action.sa_handler = sig_usr1_handler;
597 if (0 != sigaction (SIGUSR1, &sig_usr1_action, NULL)) {
599 ERROR ("Error: Failed to install a signal handler for signal USR1: %s",
600 sstrerror (errno, errbuf, sizeof (errbuf)));
605 * run the actual loops
611 if (plugin_read_all_once () != 0)
616 INFO ("Initialization complete, entering read-loop.");
621 INFO ("Exiting normally.");
628 #endif /* COLLECT_DAEMON */
630 return (exit_status);