2 * collectd - src/collectd.c
3 * Copyright (C) 2005 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; either version 2 of the License, or (at your
8 * option) any later version.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
20 * Florian octo Forster <octo at verplant.org>
21 * Alvaro Barcellos <alvaro.barcellos at gmail.com>
26 #include "utils_debug.h"
30 #include "configfile.h"
38 #endif /* HAVE_LIBKSTAT */
46 static void sigIntHandler (int signal)
51 static void sigTermHandler (int signal)
56 static int change_basedir (char *dir)
58 int dirlen = strlen (dir);
60 while ((dirlen > 0) && (dir[dirlen - 1] == '/'))
66 if (chdir (dir) == -1)
70 if (mkdir (dir, 0755) == -1)
72 syslog (LOG_ERR, "mkdir (%s): %s", dir, strerror (errno));
75 else if (chdir (dir) == -1)
77 syslog (LOG_ERR, "chdir (%s): %s", dir, strerror (errno));
83 syslog (LOG_ERR, "chdir: %s", strerror (errno));
89 } /* static int change_basedir (char *dir) */
92 static void update_kstat (void)
96 if ((kc = kstat_open ()) == NULL)
97 syslog (LOG_ERR, "Unable to open kstat control structure");
102 kid = kstat_chain_update (kc);
105 syslog (LOG_INFO, "kstat chain has been updated");
109 syslog (LOG_ERR, "kstat chain update failed");
110 /* else: everything works as expected */
114 } /* static void update_kstat (void) */
115 #endif /* HAVE_LIBKSTAT */
118 * Remove all settings but `-f' and `-C'
120 static void exit_usage (char *name)
122 printf ("Usage: "PACKAGE" [OPTIONS]\n\n"
124 "Available options:\n"
126 " -C <file> Configuration file.\n"
127 " Default: "CONFIGFILE"\n"
129 " -f Don't fork to the background.\n"
131 "\nBuiltin defaults:\n"
132 " Config-File "CONFIGFILE"\n"
133 " PID-File "PIDFILE"\n"
134 " Data-Directory "PKGLOCALSTATEDIR"\n"
136 " Log-File "LOGFILE"\n"
138 "\n"PACKAGE" "VERSION", http://verplant.org/collectd/\n"
139 "by Florian octo Forster <octo@verplant.org>\n"
140 "for contributions see `AUTHORS'\n");
142 } /* static void exit_usage (char *name) */
144 static int start_client (void)
156 syslog (LOG_ERR, "sg_init: %s", sg_str_error (sg_get_error ()));
160 if (sg_drop_privileges ())
162 syslog (LOG_ERR, "sg_drop_privileges: %s", sg_str_error (sg_get_error ()));
171 curtime = time (NULL);
178 while (sleepingtime != 0)
182 sleepingtime = sleep (sleepingtime);
187 } /* static int start_client (void) */
190 static int start_server (void)
192 /* FIXME use stack here! */
200 if (network_receive (&host, &type, &instance, &values) == 0)
201 plugin_write (host, type, instance, values);
203 if (host != NULL) free (host); host = NULL;
204 if (type != NULL) free (type); type = NULL;
205 if (instance != NULL) free (instance); instance = NULL;
206 if (values != NULL) free (values); values = NULL;
210 } /* static int start_server (void) */
211 #endif /* HAVE_LIBRRD */
214 static int pidfile_create (const char *file)
221 if ((fh = fopen (file, "w")) == NULL)
223 syslog (LOG_ERR, "fopen (%s): %s", file, strerror (errno));
227 fprintf (fh, "%d\n", getpid());
231 } /* static int pidfile_create (const char *file) */
232 #endif /* COLLECT_DAEMON */
235 static int pidfile_remove (const char *file)
240 return (unlink (file));
241 } /* static int pidfile_remove (const char *file) */
242 #endif /* COLLECT_DAEMON */
244 int main (int argc, char **argv)
246 struct sigaction sigIntAction;
247 struct sigaction sigTermAction;
248 char *datadir = PKGLOCALSTATEDIR;
249 char *configfile = CONFIGFILE;
251 struct sigaction sigChldAction;
252 char *pidfile = PIDFILE;
257 char *logfile = LOGFILE;
261 operating_mode = MODE_LOCAL;
265 openlog (PACKAGE, LOG_CONS | LOG_PID, LOG_DAEMON);
272 c = getopt (argc, argv, "hC:"
290 #endif /* COLLECT_DAEMON */
293 exit_usage (argv[0]);
298 if ((logfile = cf_get_option ("LogFile", LOGFILE)) != NULL)
299 DBG_STARTFILE (logfile, "Debug file opened.");
303 * Read options from the config file, the environment and the command
304 * line (in that order, with later options overwriting previous ones in
306 * Also, this will automatically load modules.
308 if (cf_read (configfile))
310 fprintf (stderr, "Error: Reading the config file failed!\n"
311 "Read the syslog for details.\n");
316 * Change directory. We do this _after_ reading the config and loading
317 * modules to relative paths work as expected.
319 if ((datadir = cf_get_option ("DataDir", PKGLOCALSTATEDIR)) == NULL)
321 fprintf (stderr, "Don't have a datadir to use. This should not happen. Ever.");
324 if (change_basedir (datadir))
326 fprintf (stderr, "Error: Unable to change to directory `%s'.\n", datadir);
334 sigChldAction.sa_handler = SIG_IGN;
335 sigaction (SIGCHLD, &sigChldAction, NULL);
337 if ((pidfile = cf_get_option ("PIDFile", PIDFILE)) == NULL)
339 fprintf (stderr, "Cannot obtain pidfile. This shoud not happen. Ever.");
345 if ((pid = fork ()) == -1)
348 fprintf (stderr, "fork: %s", strerror (errno));
354 /* printf ("Running (PID %i)\n", pid); */
358 /* Detach from session */
362 if (pidfile_create (pidfile))
365 /* close standard descriptors */
370 if (open ("/dev/null", O_RDWR) != 0)
372 syslog (LOG_ERR, "Error: Could not connect `STDIN' to `/dev/null'");
377 syslog (LOG_ERR, "Error: Could not connect `STDOUT' to `/dev/null'");
382 syslog (LOG_ERR, "Error: Could not connect `STDERR' to `/dev/null'");
385 } /* if (daemonize) */
386 #endif /* COLLECT_DAEMON */
389 * install signal handlers
391 sigIntAction.sa_handler = sigIntHandler;
392 sigaction (SIGINT, &sigIntAction, NULL);
394 sigTermAction.sa_handler = sigTermHandler;
395 sigaction (SIGTERM, &sigTermAction, NULL);
398 * run the actual loops
401 if (operating_mode == MODE_SERVER)
403 else /* if (operating_mode == MODE_CLIENT || operating_mode == MODE_LOCAL || operating_mode == MODE_LOG) */
409 DBG_STOPFILE("debug file closed.");
413 syslog (LOG_INFO, "Exiting normally");
418 pidfile_remove (pidfile);
419 #endif /* COLLECT_DAEMON */
422 } /* int main (int argc, char **argv) */