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"
38 char hostname_g[DATA_MAX_NAME_LEN];
42 #endif /* HAVE_LIBKSTAT */
46 static void *do_flush (void *arg)
48 INFO ("Flushing all data.");
49 plugin_flush_all (-1);
50 INFO ("Finished flushing all data.");
55 static void sig_int_handler (int signal)
60 static void sig_term_handler (int signal)
65 static void sig_usr1_handler (int signal)
70 /* flushing the data might take a while,
71 * so it should be done asynchronously */
72 pthread_attr_init (&attr);
73 pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
74 pthread_create (&thread, &attr, do_flush, NULL);
77 static int init_hostname (void)
81 struct addrinfo ai_hints;
82 struct addrinfo *ai_list;
83 struct addrinfo *ai_ptr;
86 str = global_option_get ("Hostname");
89 strncpy (hostname_g, str, sizeof (hostname_g));
90 hostname_g[sizeof (hostname_g) - 1] = '\0';
94 if (gethostname (hostname_g, sizeof (hostname_g)) != 0)
96 fprintf (stderr, "`gethostname' failed and no "
97 "hostname was configured.\n");
101 str = global_option_get ("FQDNLookup");
102 if ((strcasecmp ("false", str) == 0)
103 || (strcasecmp ("no", str) == 0)
104 || (strcasecmp ("off", str) == 0))
107 memset (&ai_hints, '\0', sizeof (ai_hints));
108 ai_hints.ai_flags = AI_CANONNAME;
110 status = getaddrinfo (hostname_g, NULL, &ai_hints, &ai_list);
113 ERROR ("Looking up \"%s\" failed. You have set the "
114 "\"FQDNLookup\" option, but I cannot resolve "
115 "my hostname to a fully qualified domain "
116 "name. Please fix you network "
117 "configuration.", hostname_g);
121 for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
123 if (ai_ptr->ai_canonname == NULL)
126 strncpy (hostname_g, ai_ptr->ai_canonname, sizeof (hostname_g));
127 hostname_g[sizeof (hostname_g) - 1] = '\0';
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 (void)
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 " -P <file> PID-file.\n"
255 " Default: "PIDFILE"\n"
257 " -f Don't fork to the background.\n"
259 " -h Display help (this message)\n"
260 "\nBuiltin defaults:\n"
261 " Config-File "CONFIGFILE"\n"
262 " PID-File "PIDFILE"\n"
263 " Data-Directory "PKGLOCALSTATEDIR"\n"
264 "\n"PACKAGE" "VERSION", http://collectd.org/\n"
265 "by Florian octo Forster <octo@verplant.org>\n"
266 "for contributions see `AUTHORS'\n");
268 } /* static void exit_usage (char *name) */
270 static int do_init (void)
280 ERROR ("sg_init: %s", sg_str_error (sg_get_error ()));
284 if (sg_drop_privileges ())
286 ERROR ("sg_drop_privileges: %s", sg_str_error (sg_get_error ()));
294 } /* int do_init () */
297 static int do_loop (void)
299 struct timeval tv_now;
300 struct timeval tv_next;
301 struct timespec ts_wait;
305 if (gettimeofday (&tv_next, NULL) < 0)
308 ERROR ("gettimeofday failed: %s",
309 sstrerror (errno, errbuf,
313 tv_next.tv_sec += interval_g;
319 /* Issue all plugins */
322 if (gettimeofday (&tv_now, NULL) < 0)
325 ERROR ("gettimeofday failed: %s",
326 sstrerror (errno, errbuf,
331 if (timeval_sub_timespec (&tv_next, &tv_now, &ts_wait) != 0)
333 WARNING ("Not sleeping because "
334 "`timeval_sub_timespec' returned "
339 while ((loop == 0) && (nanosleep (&ts_wait, &ts_wait) == -1))
344 ERROR ("nanosleep failed: %s",
345 sstrerror (errno, errbuf,
350 } /* while (loop == 0) */
352 DEBUG ("return (0);");
356 static int do_shutdown (void)
358 plugin_shutdown_all ();
360 } /* int do_shutdown */
363 static int pidfile_create (void)
366 const char *file = global_option_get ("PIDFile");
368 if ((fh = fopen (file, "w")) == NULL)
371 ERROR ("fopen (%s): %s", file,
372 sstrerror (errno, errbuf, sizeof (errbuf)));
376 fprintf (fh, "%i\n", (int) getpid ());
380 } /* static int pidfile_create (const char *file) */
382 static int pidfile_remove (void)
384 const char *file = global_option_get ("PIDFile");
386 DEBUG ("unlink (%s)", (file != NULL) ? file : "<null>");
387 return (unlink (file));
388 } /* static int pidfile_remove (const char *file) */
389 #endif /* COLLECT_DAEMON */
391 int main (int argc, char **argv)
393 struct sigaction sig_int_action;
394 struct sigaction sig_term_action;
395 struct sigaction sig_usr1_action;
396 char *configfile = CONFIGFILE;
400 struct sigaction sigChldAction;
410 c = getopt (argc, argv, "htC:"
429 global_option_set ("PIDFile", optarg);
434 #endif /* COLLECT_DAEMON */
442 * Read options from the config file, the environment and the command
443 * line (in that order, with later options overwriting previous ones in
445 * Also, this will automatically load modules.
447 if (cf_read (configfile))
449 fprintf (stderr, "Error: Reading the config file failed!\n"
450 "Read the syslog for details.\n");
455 * Change directory. We do this _after_ reading the config and loading
456 * modules to relative paths work as expected.
458 if ((basedir = global_option_get ("BaseDir")) == NULL)
460 fprintf (stderr, "Don't have a basedir to use. This should not happen. Ever.");
463 else if (change_basedir (basedir))
465 fprintf (stderr, "Error: Unable to change to directory `%s'.\n", basedir);
470 * Set global variables or, if that failes, exit. We cannot run with
471 * them being uninitialized. If nothing is configured, then defaults
472 * are being used. So this means that the user has actually done
475 if (init_global_variables () != 0)
485 memset (&sigChldAction, '\0', sizeof (sigChldAction));
486 sigChldAction.sa_handler = SIG_IGN;
487 sigaction (SIGCHLD, &sigChldAction, NULL);
491 if ((pid = fork ()) == -1)
495 fprintf (stderr, "fork: %s",
496 sstrerror (errno, errbuf,
503 /* printf ("Running (PID %i)\n", pid); */
507 /* Detach from session */
511 if (pidfile_create ())
514 /* close standard descriptors */
519 if (open ("/dev/null", O_RDWR) != 0)
521 ERROR ("Error: Could not connect `STDIN' to `/dev/null'");
526 ERROR ("Error: Could not connect `STDOUT' to `/dev/null'");
531 ERROR ("Error: Could not connect `STDERR' to `/dev/null'");
534 } /* if (daemonize) */
535 #endif /* COLLECT_DAEMON */
538 * install signal handlers
540 memset (&sig_int_action, '\0', sizeof (sig_int_action));
541 sig_int_action.sa_handler = sig_int_handler;
542 if (0 != sigaction (SIGINT, &sig_int_action, NULL)) {
544 ERROR ("Error: Failed to install a signal handler for signal INT: %s",
545 sstrerror (errno, errbuf, sizeof (errbuf)));
549 memset (&sig_term_action, '\0', sizeof (sig_term_action));
550 sig_term_action.sa_handler = sig_term_handler;
551 if (0 != sigaction (SIGTERM, &sig_term_action, NULL)) {
553 ERROR ("Error: Failed to install a signal handler for signal TERM: %s",
554 sstrerror (errno, errbuf, sizeof (errbuf)));
558 memset (&sig_usr1_action, '\0', sizeof (sig_usr1_action));
559 sig_usr1_action.sa_handler = sig_usr1_handler;
560 if (0 != sigaction (SIGUSR1, &sig_usr1_action, NULL)) {
562 ERROR ("Error: Failed to install a signal handler for signal USR1: %s",
563 sstrerror (errno, errbuf, sizeof (errbuf)));
568 * run the actual loops
574 INFO ("Exiting normally");
581 #endif /* COLLECT_DAEMON */