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 " Step "COLLECTD_STEP" seconds\n"
142 " Heartbeat "COLLECTD_HEARTBEAT" seconds\n"
143 "\n"PACKAGE" "VERSION", http://verplant.org/collectd/\n"
144 "by Florian octo Forster <octo@verplant.org>\n"
145 "for contributions see `AUTHORS'\n");
147 } /* static void exit_usage (char *name) */
149 static int start_client (void)
153 struct timeval tv_now;
154 struct timeval tv_next;
155 struct timespec ts_wait;
157 step = atoi (COLLECTD_STEP);
169 syslog (LOG_ERR, "sg_init: %s", sg_str_error (sg_get_error ()));
173 if (sg_drop_privileges ())
175 syslog (LOG_ERR, "sg_drop_privileges: %s", sg_str_error (sg_get_error ()));
184 if (gettimeofday (&tv_next, NULL) < 0)
186 syslog (LOG_ERR, "gettimeofday failed: %s", strerror (errno));
189 tv_next.tv_sec += step;
194 /* `curtime' is used by many (all?) plugins as the
195 * data-sample-time passed to RRDTool */
196 curtime = time (NULL);
198 /* Issue all plugins */
201 if (gettimeofday (&tv_now, NULL) < 0)
203 syslog (LOG_ERR, "gettimeofday failed: %s", strerror (errno));
207 if (timeval_sub_timespec (&tv_next, &tv_now, &ts_wait) != 0)
209 syslog (LOG_WARNING, "No sleeping because `timeval_sub_timespec' returned non-zero!");
213 while (nanosleep (&ts_wait, &ts_wait) == -1)
217 syslog (LOG_ERR, "nanosleep failed: %s", strerror (errno));
224 } /* static int start_client (void) */
227 static int start_server (void)
229 /* FIXME use stack here! */
237 if (network_receive (&host, &type, &instance, &values) == 0)
238 plugin_write (host, type, instance, values);
240 if (host != NULL) free (host); host = NULL;
241 if (type != NULL) free (type); type = NULL;
242 if (instance != NULL) free (instance); instance = NULL;
243 if (values != NULL) free (values); values = NULL;
247 } /* static int start_server (void) */
248 #endif /* HAVE_LIBRRD */
251 static int pidfile_create (const char *file)
258 if ((fh = fopen (file, "w")) == NULL)
260 syslog (LOG_ERR, "fopen (%s): %s", file, strerror (errno));
264 fprintf (fh, "%d\n", getpid());
268 } /* static int pidfile_create (const char *file) */
269 #endif /* COLLECT_DAEMON */
272 static int pidfile_remove (const char *file)
277 return (unlink (file));
278 } /* static int pidfile_remove (const char *file) */
279 #endif /* COLLECT_DAEMON */
281 int main (int argc, char **argv)
283 struct sigaction sigIntAction;
284 struct sigaction sigTermAction;
285 char *datadir = PKGLOCALSTATEDIR;
286 char *configfile = CONFIGFILE;
288 struct sigaction sigChldAction;
289 char *pidfile = PIDFILE;
294 char *logfile = LOGFILE;
298 operating_mode = MODE_LOCAL;
302 openlog (PACKAGE, LOG_CONS | LOG_PID, LOG_DAEMON);
309 c = getopt (argc, argv, "hC:"
327 #endif /* COLLECT_DAEMON */
330 exit_usage (argv[0]);
335 if ((logfile = cf_get_option ("LogFile", LOGFILE)) != NULL)
336 DBG_STARTFILE (logfile, "Debug file opened.");
340 * Read options from the config file, the environment and the command
341 * line (in that order, with later options overwriting previous ones in
343 * Also, this will automatically load modules.
345 if (cf_read (configfile))
347 fprintf (stderr, "Error: Reading the config file failed!\n"
348 "Read the syslog for details.\n");
353 * Change directory. We do this _after_ reading the config and loading
354 * modules to relative paths work as expected.
356 if ((datadir = cf_get_option ("DataDir", PKGLOCALSTATEDIR)) == NULL)
358 fprintf (stderr, "Don't have a datadir to use. This should not happen. Ever.");
361 if (change_basedir (datadir))
363 fprintf (stderr, "Error: Unable to change to directory `%s'.\n", datadir);
371 sigChldAction.sa_handler = SIG_IGN;
372 sigaction (SIGCHLD, &sigChldAction, NULL);
374 if ((pidfile = cf_get_option ("PIDFile", PIDFILE)) == NULL)
376 fprintf (stderr, "Cannot obtain pidfile. This shoud not happen. Ever.");
382 if ((pid = fork ()) == -1)
385 fprintf (stderr, "fork: %s", strerror (errno));
391 /* printf ("Running (PID %i)\n", pid); */
395 /* Detach from session */
399 if (pidfile_create (pidfile))
402 /* close standard descriptors */
407 if (open ("/dev/null", O_RDWR) != 0)
409 syslog (LOG_ERR, "Error: Could not connect `STDIN' to `/dev/null'");
414 syslog (LOG_ERR, "Error: Could not connect `STDOUT' to `/dev/null'");
419 syslog (LOG_ERR, "Error: Could not connect `STDERR' to `/dev/null'");
422 } /* if (daemonize) */
423 #endif /* COLLECT_DAEMON */
426 * install signal handlers
428 sigIntAction.sa_handler = sigIntHandler;
429 sigaction (SIGINT, &sigIntAction, NULL);
431 sigTermAction.sa_handler = sigTermHandler;
432 sigaction (SIGTERM, &sigTermAction, NULL);
435 * run the actual loops
438 if (operating_mode == MODE_SERVER)
440 else /* if (operating_mode == MODE_CLIENT || operating_mode == MODE_LOCAL) */
446 DBG_STOPFILE("debug file closed.");
450 syslog (LOG_INFO, "Exiting normally");
455 pidfile_remove (pidfile);
456 #endif /* COLLECT_DAEMON */
459 } /* int main (int argc, char **argv) */