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"
28 #include "multicast.h"
30 #include "configfile.h"
38 #endif /* HAVE_LIBKSTAT */
41 char *pinghosts[MAX_PINGHOSTS];
42 int num_pinghosts = 0;
54 static void sigIntHandler (int signal)
59 static void sigTermHandler (int signal)
64 static int change_basedir (char *dir)
66 int dirlen = strlen (dir);
68 while ((dirlen > 0) && (dir[dirlen - 1] == '/'))
74 if (chdir (dir) == -1)
78 if (mkdir (dir, 0755) == -1)
80 syslog (LOG_ERR, "mkdir (%s): %s", dir, strerror (errno));
83 else if (chdir (dir) == -1)
85 syslog (LOG_ERR, "chdir (%s): %s", dir, strerror (errno));
91 syslog (LOG_ERR, "chdir: %s", strerror (errno));
97 } /* static int change_basedir (char *dir) */
100 static void update_kstat (void)
104 if ((kc = kstat_open ()) == NULL)
105 syslog (LOG_ERR, "Unable to open kstat control structure");
110 kid = kstat_chain_update (kc);
113 syslog (LOG_INFO, "kstat chain has been updated");
117 syslog (LOG_ERR, "kstat chain update failed");
118 /* else: everything works as expected */
122 } /* static void update_kstat (void) */
123 #endif /* HAVE_LIBKSTAT */
125 static int start_client (void)
137 syslog (LOG_ERR, "sg_init: %s", sg_str_error (sg_get_error ()));
141 if (sg_drop_privileges ())
143 syslog (LOG_ERR, "sg_drop_privileges: %s", sg_str_error (sg_get_error ()));
152 curtime = time (NULL);
159 while (sleepingtime != 0)
163 sleepingtime = sleep (sleepingtime);
168 } /* static int start_client (void) */
171 static int start_server (void)
180 if (multicast_receive (&host, &type, &instance, &values) == 0)
181 plugin_write (host, type, instance, values);
183 if (host != NULL) free (host); host = NULL;
184 if (type != NULL) free (type); type = NULL;
185 if (instance != NULL) free (instance); instance = NULL;
186 if (values != NULL) free (values); values = NULL;
190 } /* static int start_server (void) */
191 #endif /* HAVE_LIBRRD */
194 static int pidfile_create (const char *file)
201 if ((fh = fopen (file, "w")) == NULL)
203 syslog (LOG_ERR, "fopen (%s): %s", file, strerror (errno));
207 fprintf (fh, "%d\n", getpid());
211 } /* static int pidfile_create (const char *file) */
212 #endif /* COLLECT_DAEMON */
215 static int pidfile_remove (const char *file)
220 return (unlink (file));
221 } /* static int pidfile_remove (const char *file) */
222 #endif /* COLLECT_DAEMON */
224 int main (int argc, char **argv)
227 struct sigaction sigChldAction;
229 struct sigaction sigIntAction;
230 struct sigaction sigTermAction;
233 char *pidfile = PIDFILE;
238 char *logfile = LOGFILE;
242 operating_mode = MODE_LOCAL;
246 openlog (PACKAGE, LOG_CONS | LOG_PID, LOG_DAEMON);
248 DBG_STARTFILE(logfile, "Debug file opened.");
251 * Read options from the config file, the environment and the command
252 * line (in that order, with later options overwriting previous ones in
254 * Also, this will automatically load modules.
256 if (cf_read (argc, argv, CONFIGFILE))
258 fprintf (stderr, "Error: Reading the config file failed!\n"
259 "Read the syslog for details.\n");
264 * Change directory. We do this _after_ reading the config and loading
265 * modules to relative paths work as expected.
267 if ((datadir = cf_get_mode_option ("DataDir")) == NULL)
269 fprintf (stderr, "Don't have a datadir to use. This should not happen. Ever.");
272 if (change_basedir (datadir))
274 fprintf (stderr, "Error: Unable to change to directory `%s'.\n", datadir);
282 sigChldAction.sa_handler = SIG_IGN;
283 sigaction (SIGCHLD, &sigChldAction, NULL);
285 if ((pidfile = cf_get_mode_option ("PIDFile")) == NULL)
287 fprintf (stderr, "Cannot obtain pidfile. This shoud not happen. Ever.");
293 if ((pid = fork ()) == -1)
296 fprintf (stderr, "fork: %s", strerror (errno));
302 /* printf ("Running (PID %i)\n", pid); */
306 /* Detach from session */
310 if (pidfile_create (pidfile))
313 /* close standard descriptors */
318 if (open ("/dev/null", O_RDWR) != 0)
320 syslog (LOG_ERR, "Error: Could not connect `STDIN' to `/dev/null'");
325 syslog (LOG_ERR, "Error: Could not connect `STDOUT' to `/dev/null'");
330 syslog (LOG_ERR, "Error: Could not connect `STDERR' to `/dev/null'");
333 } /* if (daemonize) */
334 #endif /* COLLECT_DAEMON */
337 * install signal handlers
339 sigIntAction.sa_handler = sigIntHandler;
340 sigaction (SIGINT, &sigIntAction, NULL);
342 sigTermAction.sa_handler = sigTermHandler;
343 sigaction (SIGTERM, &sigTermAction, NULL);
346 * run the actual loops
349 if (operating_mode == MODE_SERVER)
351 else /* if (operating_mode == MODE_CLIENT || operating_mode == MODE_LOCAL) */
355 DBG_STOPFILE("debug file closed.");
358 syslog (LOG_INFO, "Exiting normally");
363 pidfile_remove (pidfile);
364 #endif /* COLLECT_DAEMON */
367 } /* int main (int argc, char **argv) */