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];
46 #endif /* HAVE_LIBKSTAT */
50 static void *do_flush (void __attribute__((unused)) *arg)
52 INFO ("Flushing all data.");
53 plugin_flush (NULL, -1, NULL);
54 INFO ("Finished flushing all data.");
59 static void sig_int_handler (int __attribute__((unused)) signal)
64 static void sig_term_handler (int __attribute__((unused)) signal)
69 static void sig_usr1_handler (int __attribute__((unused)) signal)
74 /* flushing the data might take a while,
75 * so it should be done asynchronously */
76 pthread_attr_init (&attr);
77 pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
78 pthread_create (&thread, &attr, do_flush, NULL);
81 static int init_hostname (void)
85 struct addrinfo ai_hints;
86 struct addrinfo *ai_list;
87 struct addrinfo *ai_ptr;
90 str = global_option_get ("Hostname");
93 sstrncpy (hostname_g, str, sizeof (hostname_g));
97 if (gethostname (hostname_g, sizeof (hostname_g)) != 0)
99 fprintf (stderr, "`gethostname' failed and no "
100 "hostname was configured.\n");
104 str = global_option_get ("FQDNLookup");
108 memset (&ai_hints, '\0', sizeof (ai_hints));
109 ai_hints.ai_flags = AI_CANONNAME;
111 status = getaddrinfo (hostname_g, NULL, &ai_hints, &ai_list);
114 ERROR ("Looking up \"%s\" failed. You have set the "
115 "\"FQDNLookup\" option, but I cannot resolve "
116 "my hostname to a fully qualified domain "
117 "name. Please fix you network "
118 "configuration.", hostname_g);
122 for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
124 if (ai_ptr->ai_canonname == NULL)
127 sstrncpy (hostname_g, ai_ptr->ai_canonname, sizeof (hostname_g));
131 freeaddrinfo (ai_list);
133 } /* int init_hostname */
135 static int init_global_variables (void)
139 str = global_option_get ("Interval");
142 interval_g = atoi (str);
145 fprintf (stderr, "Cannot set the interval to a correct value.\n"
146 "Please check your settings.\n");
149 DEBUG ("interval_g = %i;", interval_g);
151 if (init_hostname () != 0)
153 DEBUG ("hostname_g = %s;", hostname_g);
156 } /* int init_global_variables */
158 static int change_basedir (const char *orig_dir)
160 char *dir = strdup (orig_dir);
167 ERROR ("strdup failed: %s",
168 sstrerror (errno, errbuf, sizeof (errbuf)));
172 dirlen = strlen (dir);
173 while ((dirlen > 0) && (dir[dirlen - 1] == '/'))
174 dir[--dirlen] = '\0';
179 status = chdir (dir);
186 if (mkdir (orig_dir, 0755) == -1)
189 ERROR ("change_basedir: mkdir (%s): %s", orig_dir,
190 sstrerror (errno, errbuf,
194 else if (chdir (orig_dir) == -1)
197 ERROR ("chdir (%s): %s", orig_dir,
198 sstrerror (errno, errbuf,
206 ERROR ("chdir (%s): %s", orig_dir,
207 sstrerror (errno, errbuf,
214 } /* static int change_basedir (char *dir) */
217 static void update_kstat (void)
221 if ((kc = kstat_open ()) == NULL)
222 ERROR ("Unable to open kstat control structure");
227 kid = kstat_chain_update (kc);
230 INFO ("kstat chain has been updated");
234 ERROR ("kstat chain update failed");
235 /* else: everything works as expected */
239 } /* static void update_kstat (void) */
240 #endif /* HAVE_LIBKSTAT */
243 * Remove all settings but `-f' and `-C'
245 static void exit_usage (int status)
247 printf ("Usage: "PACKAGE" [OPTIONS]\n\n"
249 "Available options:\n"
251 " -C <file> Configuration file.\n"
252 " Default: "CONFIGFILE"\n"
253 " -t Test config and exit.\n"
254 " -T Test plugin read and exit.\n"
255 " -P <file> PID-file.\n"
256 " Default: "PIDFILE"\n"
258 " -f Don't fork to the background.\n"
260 " -h Display help (this message)\n"
261 "\nBuiltin defaults:\n"
262 " Config file "CONFIGFILE"\n"
263 " PID file "PIDFILE"\n"
264 " Plugin directory "PLUGINDIR"\n"
265 " Data directory "PKGLOCALSTATEDIR"\n"
266 "\n"PACKAGE" "VERSION", http://collectd.org/\n"
267 "by Florian octo Forster <octo@verplant.org>\n"
268 "for contributions see `AUTHORS'\n");
270 } /* static void exit_usage (int status) */
272 static int do_init (void)
282 ERROR ("sg_init: %s", sg_str_error (sg_get_error ()));
286 if (sg_drop_privileges ())
288 ERROR ("sg_drop_privileges: %s", sg_str_error (sg_get_error ()));
296 } /* int do_init () */
299 static int do_loop (void)
301 struct timeval tv_now;
302 struct timeval tv_next;
303 struct timeval tv_wait;
304 struct timespec ts_wait;
308 if (gettimeofday (&tv_next, NULL) < 0)
311 ERROR ("gettimeofday failed: %s",
312 sstrerror (errno, errbuf,
316 tv_next.tv_sec += interval_g;
322 /* Issue all plugins */
325 if (gettimeofday (&tv_now, NULL) < 0)
328 ERROR ("gettimeofday failed: %s",
329 sstrerror (errno, errbuf,
334 if (timeval_cmp (tv_next, tv_now, &tv_wait) <= 0)
336 WARNING ("Not sleeping because the next interval is "
337 "%i.%06i seconds in the past!",
338 (int) tv_wait.tv_sec, (int) tv_wait.tv_usec);
342 ts_wait.tv_sec = tv_wait.tv_sec;
343 ts_wait.tv_nsec = (long) (1000 * tv_wait.tv_usec);
345 while ((loop == 0) && (nanosleep (&ts_wait, &ts_wait) == -1))
350 ERROR ("nanosleep failed: %s",
351 sstrerror (errno, errbuf,
356 } /* while (loop == 0) */
358 DEBUG ("return (0);");
362 static int do_shutdown (void)
364 plugin_shutdown_all ();
366 } /* int do_shutdown */
369 static int pidfile_create (void)
372 const char *file = global_option_get ("PIDFile");
374 if ((fh = fopen (file, "w")) == NULL)
377 ERROR ("fopen (%s): %s", file,
378 sstrerror (errno, errbuf, sizeof (errbuf)));
382 fprintf (fh, "%i\n", (int) getpid ());
386 } /* static int pidfile_create (const char *file) */
388 static int pidfile_remove (void)
390 const char *file = global_option_get ("PIDFile");
392 DEBUG ("unlink (%s)", (file != NULL) ? file : "<null>");
393 return (unlink (file));
394 } /* static int pidfile_remove (const char *file) */
395 #endif /* COLLECT_DAEMON */
397 int main (int argc, char **argv)
399 struct sigaction sig_int_action;
400 struct sigaction sig_term_action;
401 struct sigaction sig_usr1_action;
402 struct sigaction sig_pipe_action;
403 char *configfile = CONFIGFILE;
405 int test_readall = 0;
408 struct sigaction sig_chld_action;
419 c = getopt (argc, argv, "htTC:"
438 global_option_set ("ReadThreads", "-1");
441 #endif /* COLLECT_DAEMON */
445 global_option_set ("PIDFile", optarg);
450 #endif /* COLLECT_DAEMON */
463 * Read options from the config file, the environment and the command
464 * line (in that order, with later options overwriting previous ones in
466 * Also, this will automatically load modules.
468 if (cf_read (configfile))
470 fprintf (stderr, "Error: Reading the config file failed!\n"
471 "Read the syslog for details.\n");
476 * Change directory. We do this _after_ reading the config and loading
477 * modules to relative paths work as expected.
479 if ((basedir = global_option_get ("BaseDir")) == NULL)
481 fprintf (stderr, "Don't have a basedir to use. This should not happen. Ever.");
484 else if (change_basedir (basedir))
486 fprintf (stderr, "Error: Unable to change to directory `%s'.\n", basedir);
491 * Set global variables or, if that failes, exit. We cannot run with
492 * them being uninitialized. If nothing is configured, then defaults
493 * are being used. So this means that the user has actually done
496 if (init_global_variables () != 0)
506 memset (&sig_chld_action, '\0', sizeof (sig_chld_action));
507 sig_chld_action.sa_handler = SIG_IGN;
508 sigaction (SIGCHLD, &sig_chld_action, NULL);
512 if ((pid = fork ()) == -1)
516 fprintf (stderr, "fork: %s",
517 sstrerror (errno, errbuf,
524 /* printf ("Running (PID %i)\n", pid); */
528 /* Detach from session */
532 if (pidfile_create ())
535 /* close standard descriptors */
540 if (open ("/dev/null", O_RDWR) != 0)
542 ERROR ("Error: Could not connect `STDIN' to `/dev/null'");
547 ERROR ("Error: Could not connect `STDOUT' to `/dev/null'");
552 ERROR ("Error: Could not connect `STDERR' to `/dev/null'");
555 } /* if (daemonize) */
556 #endif /* COLLECT_DAEMON */
558 memset (&sig_pipe_action, '\0', sizeof (sig_pipe_action));
559 sig_pipe_action.sa_handler = SIG_IGN;
560 sigaction (SIGPIPE, &sig_pipe_action, NULL);
563 * install signal handlers
565 memset (&sig_int_action, '\0', sizeof (sig_int_action));
566 sig_int_action.sa_handler = sig_int_handler;
567 if (0 != sigaction (SIGINT, &sig_int_action, NULL)) {
569 ERROR ("Error: Failed to install a signal handler for signal INT: %s",
570 sstrerror (errno, errbuf, sizeof (errbuf)));
574 memset (&sig_term_action, '\0', sizeof (sig_term_action));
575 sig_term_action.sa_handler = sig_term_handler;
576 if (0 != sigaction (SIGTERM, &sig_term_action, NULL)) {
578 ERROR ("Error: Failed to install a signal handler for signal TERM: %s",
579 sstrerror (errno, errbuf, sizeof (errbuf)));
583 memset (&sig_usr1_action, '\0', sizeof (sig_usr1_action));
584 sig_usr1_action.sa_handler = sig_usr1_handler;
585 if (0 != sigaction (SIGUSR1, &sig_usr1_action, NULL)) {
587 ERROR ("Error: Failed to install a signal handler for signal USR1: %s",
588 sstrerror (errno, errbuf, sizeof (errbuf)));
593 * run the actual loops
599 if (plugin_read_all_once () != 0)
604 INFO ("Initialization complete, entering read-loop.");
609 INFO ("Exiting normally.");
616 #endif /* COLLECT_DAEMON */
618 return (exit_status);