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 */
49 static void sigIntHandler (int signal)
54 static void sigTermHandler (int signal)
59 static int change_basedir (char *dir)
61 int dirlen = strlen (dir);
63 while ((dirlen > 0) && (dir[dirlen - 1] == '/'))
69 if (chdir (dir) == -1)
73 if (mkdir (dir, 0755) == -1)
75 syslog (LOG_ERR, "mkdir (%s): %s", dir, strerror (errno));
78 else if (chdir (dir) == -1)
80 syslog (LOG_ERR, "chdir (%s): %s", dir, strerror (errno));
86 syslog (LOG_ERR, "chdir: %s", strerror (errno));
92 } /* static int change_basedir (char *dir) */
95 static void update_kstat (void)
99 if ((kc = kstat_open ()) == NULL)
100 syslog (LOG_ERR, "Unable to open kstat control structure");
105 kid = kstat_chain_update (kc);
108 syslog (LOG_INFO, "kstat chain has been updated");
112 syslog (LOG_ERR, "kstat chain update failed");
113 /* else: everything works as expected */
117 } /* static void update_kstat (void) */
118 #endif /* HAVE_LIBKSTAT */
121 * Remove all settings but `-f' and `-C'
123 static void exit_usage (char *name)
125 printf ("Usage: "PACKAGE" [OPTIONS]\n\n"
127 "Available options:\n"
129 " -C <file> Configuration file.\n"
130 " Default: "CONFIGFILE"\n"
132 " -f Don't fork to the background.\n"
134 "\nBuiltin defaults:\n"
135 " Config-File "CONFIGFILE"\n"
136 " PID-File "PIDFILE"\n"
137 " Data-Directory "PKGLOCALSTATEDIR"\n"
139 " Log-File "LOGFILE"\n"
141 "\n"PACKAGE" "VERSION", http://verplant.org/collectd/\n"
142 "by Florian octo Forster <octo@verplant.org>\n"
143 "for contributions see `AUTHORS'\n");
145 } /* static void exit_usage (char *name) */
147 static int start_client (void)
159 syslog (LOG_ERR, "sg_init: %s", sg_str_error (sg_get_error ()));
163 if (sg_drop_privileges ())
165 syslog (LOG_ERR, "sg_drop_privileges: %s", sg_str_error (sg_get_error ()));
174 curtime = time (NULL);
181 while (sleepingtime != 0)
185 sleepingtime = sleep (sleepingtime);
190 } /* static int start_client (void) */
193 static int start_server (void)
195 /* FIXME use stack here! */
203 if (network_receive (&host, &type, &instance, &values) == 0)
204 plugin_write (host, type, instance, values);
206 if (host != NULL) free (host); host = NULL;
207 if (type != NULL) free (type); type = NULL;
208 if (instance != NULL) free (instance); instance = NULL;
209 if (values != NULL) free (values); values = NULL;
213 } /* static int start_server (void) */
214 #endif /* HAVE_LIBRRD */
217 static int pidfile_create (const char *file)
224 if ((fh = fopen (file, "w")) == NULL)
226 syslog (LOG_ERR, "fopen (%s): %s", file, strerror (errno));
230 fprintf (fh, "%d\n", getpid());
234 } /* static int pidfile_create (const char *file) */
235 #endif /* COLLECT_DAEMON */
238 static int pidfile_remove (const char *file)
243 return (unlink (file));
244 } /* static int pidfile_remove (const char *file) */
245 #endif /* COLLECT_DAEMON */
247 int main (int argc, char **argv)
249 struct sigaction sigIntAction;
250 struct sigaction sigTermAction;
251 char *datadir = PKGLOCALSTATEDIR;
252 char *configfile = CONFIGFILE;
254 struct sigaction sigChldAction;
255 char *pidfile = PIDFILE;
260 char *logfile = LOGFILE;
264 operating_mode = MODE_LOCAL;
268 openlog (PACKAGE, LOG_CONS | LOG_PID, LOG_DAEMON);
275 c = getopt (argc, argv, "hC:"
293 #endif /* COLLECT_DAEMON */
296 exit_usage (argv[0]);
301 if ((logfile = cf_get_option ("LogFile", LOGFILE)) != NULL)
302 DBG_STARTFILE (logfile, "Debug file opened.");
306 * Read options from the config file, the environment and the command
307 * line (in that order, with later options overwriting previous ones in
309 * Also, this will automatically load modules.
311 if (cf_read (configfile))
313 fprintf (stderr, "Error: Reading the config file failed!\n"
314 "Read the syslog for details.\n");
319 * Change directory. We do this _after_ reading the config and loading
320 * modules to relative paths work as expected.
322 if ((datadir = cf_get_option ("DataDir", PKGLOCALSTATEDIR)) == NULL)
324 fprintf (stderr, "Don't have a datadir to use. This should not happen. Ever.");
327 if (change_basedir (datadir))
329 fprintf (stderr, "Error: Unable to change to directory `%s'.\n", datadir);
337 sigChldAction.sa_handler = SIG_IGN;
338 sigaction (SIGCHLD, &sigChldAction, NULL);
340 if ((pidfile = cf_get_option ("PIDFile", PIDFILE)) == NULL)
342 fprintf (stderr, "Cannot obtain pidfile. This shoud not happen. Ever.");
348 if ((pid = fork ()) == -1)
351 fprintf (stderr, "fork: %s", strerror (errno));
357 /* printf ("Running (PID %i)\n", pid); */
361 /* Detach from session */
365 if (pidfile_create (pidfile))
368 /* close standard descriptors */
373 if (open ("/dev/null", O_RDWR) != 0)
375 syslog (LOG_ERR, "Error: Could not connect `STDIN' to `/dev/null'");
380 syslog (LOG_ERR, "Error: Could not connect `STDOUT' to `/dev/null'");
385 syslog (LOG_ERR, "Error: Could not connect `STDERR' to `/dev/null'");
388 } /* if (daemonize) */
389 #endif /* COLLECT_DAEMON */
392 * install signal handlers
394 sigIntAction.sa_handler = sigIntHandler;
395 sigaction (SIGINT, &sigIntAction, NULL);
397 sigTermAction.sa_handler = sigTermHandler;
398 sigaction (SIGTERM, &sigTermAction, NULL);
401 * run the actual loops
404 if (operating_mode == MODE_SERVER)
406 else /* if (operating_mode == MODE_CLIENT || operating_mode == MODE_LOCAL) */
412 DBG_STOPFILE("debug file closed.");
416 syslog (LOG_INFO, "Exiting normally");
421 pidfile_remove (pidfile);
422 #endif /* COLLECT_DAEMON */
425 } /* int main (int argc, char **argv) */