2 * collectd - src/collectdmon.c
3 * Copyright (C) 2007 Sebastian Harl
5 * Permission is hereby granted, free of charge, to any person obtaining a
6 * copy of this software and associated documentation files (the "Software"),
7 * to deal in the Software without restriction, including without limitation
8 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
9 * and/or sell copies of the Software, and to permit persons to whom the
10 * Software is furnished to do so, subject to the following conditions:
12 * The above copyright notice and this permission notice shall be included in
13 * all copies or substantial portions of the Software.
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
21 * DEALINGS IN THE SOFTWARE.
24 * Sebastian Harl <sh at tokkee.org>
27 #if !defined(__GNUC__) || !__GNUC__
28 # define __attribute__(x) /**/
48 #include <sys/resource.h>
50 #include <sys/types.h>
58 #ifndef COLLECTDMON_PIDFILE
59 # define COLLECTDMON_PIDFILE LOCALSTATEDIR"/run/collectdmon.pid"
60 #endif /* ! COLLECTDMON_PIDFILE */
63 # define WCOREDUMP(s) 0
64 #endif /* ! WCOREDUMP */
67 static int restart = 0;
69 static char *pidfile = NULL;
70 static pid_t collectd_pid = 0;
72 static void exit_usage (char *name)
74 printf ("Usage: %s <options> [-- <collectd options>]\n"
76 "\nAvailable options:\n"
77 " -h Display this help and exit.\n"
78 " -c <path> Path to the collectd binary.\n"
79 " -P <file> PID-file.\n"
81 "\nFor <collectd options> see collectd.conf(5).\n"
83 "\n"PACKAGE_NAME" "PACKAGE_VERSION", http://collectd.org/\n"
84 "by Florian octo Forster <octo@collectd.org>\n"
85 "for contributions see `AUTHORS'\n", name);
89 static int pidfile_create (void)
94 pidfile = COLLECTDMON_PIDFILE;
96 if (NULL == (file = fopen (pidfile, "w"))) {
97 syslog (LOG_ERR, "Error: couldn't open PID-file (%s) for writing: %s",
98 pidfile, strerror (errno));
102 fprintf (file, "%i\n", (int)getpid ());
105 } /* pidfile_create */
107 static int pidfile_delete (void)
109 assert (NULL != pidfile);
111 if (0 != unlink (pidfile)) {
112 syslog (LOG_ERR, "Error: couldn't delete PID-file (%s): %s",
113 pidfile, strerror (errno));
117 } /* pidfile_remove */
119 static int daemonize (void)
127 if (0 != chdir ("/")) {
128 fprintf (stderr, "Error: chdir() failed: %s\n", strerror (errno));
132 if (0 != getrlimit (RLIMIT_NOFILE, &rl)) {
133 fprintf (stderr, "Error: getrlimit() failed: %s\n", strerror (errno));
137 if (0 > (pid = fork ())) {
138 fprintf (stderr, "Error: fork() failed: %s\n", strerror (errno));
145 if (0 != pidfile_create ())
150 if (RLIM_INFINITY == rl.rlim_max)
153 for (i = 0; i < (int)rl.rlim_max; ++i)
156 dev_null = open ("/dev/null", O_RDWR);
157 if (dev_null == -1) {
158 syslog (LOG_ERR, "Error: couldn't failed to open /dev/null: %s", strerror (errno));
162 if (dup2 (dev_null, STDIN_FILENO) == -1) {
163 syslog (LOG_ERR, "Error: couldn't connect STDIN to /dev/null: %s", strerror (errno));
167 if (dup2 (dev_null, STDOUT_FILENO) == -1) {
168 syslog (LOG_ERR, "Error: couldn't connect STDOUT to /dev/null: %s", strerror (errno));
172 if (dup2 (dev_null, STDERR_FILENO) == -1) {
173 syslog (LOG_ERR, "Error: couldn't connect STDERR to /dev/null: %s", strerror (errno));
177 if ((dev_null != STDIN_FILENO) && (dev_null != STDOUT_FILENO) && (dev_null != STDERR_FILENO))
183 static int collectd_start (char **argv)
187 if (0 > (pid = fork ())) {
188 syslog (LOG_ERR, "Error: fork() failed: %s", strerror (errno));
196 execvp (argv[0], argv);
197 syslog (LOG_ERR, "Error: execvp(%s) failed: %s",
198 argv[0], strerror (errno));
200 } /* collectd_start */
202 static int collectd_stop (void)
204 if (0 == collectd_pid)
207 if (0 != kill (collectd_pid, SIGTERM)) {
208 syslog (LOG_ERR, "Error: kill() failed: %s", strerror (errno));
212 } /* collectd_stop */
214 static void sig_int_term_handler (int __attribute__((unused)) signo)
218 } /* sig_int_term_handler */
220 static void sig_hup_handler (int __attribute__((unused)) signo)
224 } /* sig_hup_handler */
226 static void log_status (int status)
228 if (WIFEXITED (status)) {
229 if (0 == WEXITSTATUS (status))
230 syslog (LOG_INFO, "Info: collectd terminated with exit status %i",
231 WEXITSTATUS (status));
234 "Warning: collectd terminated with exit status %i",
235 WEXITSTATUS (status));
237 else if (WIFSIGNALED (status)) {
238 syslog (LOG_WARNING, "Warning: collectd was terminated by signal %i%s",
239 WTERMSIG (status), WCOREDUMP (status) ? " (core dumped)" : "");
244 static void check_respawn (void)
246 time_t t = time (NULL);
248 static time_t timestamp = 0;
249 static int counter = 0;
251 if ((t - 120) < timestamp)
259 unsigned int time_left = 300;
261 syslog (LOG_ERR, "Error: collectd is respawning too fast - "
262 "disabled for %i seconds", time_left);
264 while ((0 < (time_left = sleep (time_left))) && (0 == loop));
267 } /* check_respawn */
269 int main (int argc, char **argv)
271 int collectd_argc = 0;
272 char *collectd = NULL;
273 char **collectd_argv = NULL;
279 /* parse command line options */
281 int c = getopt (argc, argv, "hc:P:");
295 exit_usage (argv[0]);
299 for (i = optind; i < argc; ++i)
300 if (0 == strcmp (argv[i], "-f"))
303 /* i < argc => -f already present */
304 collectd_argc = 1 + argc - optind + ((i < argc) ? 0 : 1);
305 collectd_argv = (char **)calloc (collectd_argc + 1, sizeof (char *));
307 if (NULL == collectd_argv) {
308 fprintf (stderr, "Out of memory.");
312 collectd_argv[0] = (NULL == collectd) ? "collectd" : collectd;
315 collectd_argv[collectd_argc - 1] = "-f";
317 for (i = optind; i < argc; ++i)
318 collectd_argv[i - optind + 1] = argv[i];
320 collectd_argv[collectd_argc] = NULL;
322 openlog ("collectdmon", LOG_CONS | LOG_PID, LOG_DAEMON);
324 if (-1 == daemonize ())
326 free (collectd_argv);
330 sa.sa_handler = sig_int_term_handler;
332 sigemptyset (&sa.sa_mask);
334 if (0 != sigaction (SIGINT, &sa, NULL)) {
335 syslog (LOG_ERR, "Error: sigaction() failed: %s", strerror (errno));
336 free (collectd_argv);
340 if (0 != sigaction (SIGTERM, &sa, NULL)) {
341 syslog (LOG_ERR, "Error: sigaction() failed: %s", strerror (errno));
342 free (collectd_argv);
346 sa.sa_handler = sig_hup_handler;
348 if (0 != sigaction (SIGHUP, &sa, NULL)) {
349 syslog (LOG_ERR, "Error: sigaction() failed: %s", strerror (errno));
350 free (collectd_argv);
357 if (0 != collectd_start (collectd_argv)) {
358 syslog (LOG_ERR, "Error: failed to start collectd.");
362 assert (0 < collectd_pid);
363 while ((collectd_pid != waitpid (collectd_pid, &status, 0))
365 if ((0 != loop) || (0 != restart))
374 syslog (LOG_INFO, "Info: restarting collectd");
378 syslog (LOG_WARNING, "Warning: restarting collectd");
381 syslog (LOG_INFO, "Info: shutting down collectdmon");
386 free (collectd_argv);
390 /* vim: set sw=4 ts=4 tw=78 noexpandtab : */