2 * collectd - src/collectd.c
3 * Copyright (C) 2005-2007 Florian octo Forster
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 * Florian octo Forster <octo at collectd.org>
25 * Alvaro Barcellos <alvaro.barcellos at gmail.com>
31 #include "configfile.h"
35 #include <sys/types.h>
46 #ifndef COLLECTD_LOCALE
47 #define COLLECTD_LOCALE "C"
52 static void *do_flush(void __attribute__((unused)) * arg) {
53 INFO("Flushing all data.");
54 plugin_flush(/* plugin = */ NULL,
57 INFO("Finished flushing all data.");
62 static void sig_int_handler(int __attribute__((unused)) signal) { loop++; }
64 static void sig_term_handler(int __attribute__((unused)) signal) { loop++; }
66 static void sig_usr1_handler(int __attribute__((unused)) signal) {
70 /* flushing the data might take a while,
71 * so it should be done asynchronously */
72 pthread_attr_init(&attr);
73 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
74 pthread_create(&thread, &attr, do_flush, NULL);
75 pthread_attr_destroy(&attr);
78 static int init_hostname(void) {
81 struct addrinfo *ai_list;
84 str = global_option_get("Hostname");
85 if ((str != NULL) && (str[0] != 0)) {
86 sstrncpy(hostname_g, str, hostname_g_size);
90 if (gethostname(hostname_g, hostname_g_size) != 0) {
91 fprintf(stderr, "`gethostname' failed and no "
92 "hostname was configured.\n");
96 str = global_option_get("FQDNLookup");
100 struct addrinfo ai_hints = {.ai_flags = AI_CANONNAME};
102 status = getaddrinfo(hostname_g, NULL, &ai_hints, &ai_list);
104 ERROR("Looking up \"%s\" failed. You have set the "
105 "\"FQDNLookup\" option, but I cannot resolve "
106 "my hostname to a fully qualified domain "
107 "name. Please fix the network "
113 for (struct addrinfo *ai_ptr = ai_list; ai_ptr != NULL;
114 ai_ptr = ai_ptr->ai_next) {
115 if (ai_ptr->ai_canonname == NULL)
118 sstrncpy(hostname_g, ai_ptr->ai_canonname, hostname_g_size);
122 freeaddrinfo(ai_list);
124 } /* int init_hostname */
126 static int init_global_variables(void) {
129 interval_g = cf_get_default_interval();
130 assert(interval_g > 0);
131 DEBUG("interval_g = %.3f;", CDTIME_T_TO_DOUBLE(interval_g));
133 str = global_option_get("Timeout");
136 timeout_g = atoi(str);
137 if (timeout_g <= 1) {
138 fprintf(stderr, "Cannot set the timeout to a correct value.\n"
139 "Please check your settings.\n");
142 DEBUG("timeout_g = %i;", timeout_g);
144 if (init_hostname() != 0)
146 DEBUG("hostname_g = %s;", hostname_g);
149 } /* int init_global_variables */
151 static int change_basedir(const char *orig_dir, _Bool create) {
156 dir = strdup(orig_dir);
159 ERROR("strdup failed: %s", sstrerror(errno, errbuf, sizeof(errbuf)));
163 dirlen = strlen(dir);
164 while ((dirlen > 0) && (dir[dirlen - 1] == '/'))
165 dir[--dirlen] = '\0';
176 } else if (!create || (errno != ENOENT)) {
178 ERROR("change_basedir: chdir (%s): %s", dir,
179 sstrerror(errno, errbuf, sizeof(errbuf)));
184 status = mkdir(dir, S_IRWXU | S_IRWXG | S_IRWXO);
187 ERROR("change_basedir: mkdir (%s): %s", dir,
188 sstrerror(errno, errbuf, sizeof(errbuf)));
196 ERROR("change_basedir: chdir (%s): %s", dir,
197 sstrerror(errno, errbuf, sizeof(errbuf)));
204 } /* static int change_basedir (char *dir) */
207 static void update_kstat(void) {
209 if ((kc = kstat_open()) == NULL)
210 ERROR("Unable to open kstat control structure");
213 kid = kstat_chain_update(kc);
215 INFO("kstat chain has been updated");
218 ERROR("kstat chain update failed");
219 /* else: everything works as expected */
223 } /* static void update_kstat (void) */
224 #endif /* HAVE_LIBKSTAT */
227 * Remove all settings but `-f' and `-C'
229 __attribute__((noreturn)) static void exit_usage(int status) {
230 printf("Usage: " PACKAGE_NAME " [OPTIONS]\n\n"
232 "Available options:\n"
234 " -C <file> Configuration file.\n"
235 " Default: " CONFIGFILE "\n"
236 " -t Test config and exit.\n"
237 " -T Test plugin read and exit.\n"
238 " -P <file> PID-file.\n"
239 " Default: " PIDFILE "\n"
241 " -f Don't fork to the background.\n"
243 " -B Don't create the BaseDir\n"
244 " -h Display help (this message)\n"
245 "\nBuiltin defaults:\n"
246 " Config file " CONFIGFILE "\n"
247 " PID file " PIDFILE "\n"
248 " Plugin directory " PLUGINDIR "\n"
249 " Data directory " PKGLOCALSTATEDIR "\n"
250 "\n" PACKAGE_NAME " " PACKAGE_VERSION ", http://collectd.org/\n"
251 "by Florian octo Forster <octo@collectd.org>\n"
252 "for contributions see `AUTHORS'\n");
254 } /* static void exit_usage (int status) */
256 static int do_init(void) {
258 if (setlocale(LC_NUMERIC, COLLECTD_LOCALE) == NULL)
259 WARNING("setlocale (\"%s\") failed.", COLLECTD_LOCALE);
261 /* Update the environment, so that libraries that are calling
262 * setlocale(LC_NUMERIC, "") don't accidentally revert these changes. */
264 setenv("LC_NUMERIC", COLLECTD_LOCALE, /* overwrite = */ 1);
274 #if HAVE_LIBSTATGRAB_0_90
278 ERROR("sg_init: %s", sg_str_error(sg_get_error()));
282 if (sg_drop_privileges()) {
283 ERROR("sg_drop_privileges: %s", sg_str_error(sg_get_error()));
288 return plugin_init_all();
289 } /* int do_init () */
291 static int do_loop(void) {
292 cdtime_t interval = cf_get_default_interval();
295 wait_until = cdtime() + interval;
304 /* Issue all plugins */
308 if (now >= wait_until) {
309 WARNING("Not sleeping because the next interval is "
310 "%.3f seconds in the past!",
311 CDTIME_T_TO_DOUBLE(now - wait_until));
312 wait_until = now + interval;
316 struct timespec ts_wait = CDTIME_T_TO_TIMESPEC(wait_until - now);
317 wait_until = wait_until + interval;
319 while ((loop == 0) && (nanosleep(&ts_wait, &ts_wait) != 0)) {
320 if (errno != EINTR) {
322 ERROR("nanosleep failed: %s", sstrerror(errno, errbuf, sizeof(errbuf)));
326 } /* while (loop == 0) */
331 static int do_shutdown(void) {
332 return plugin_shutdown_all();
333 } /* int do_shutdown */
336 static int pidfile_create(void) {
338 const char *file = global_option_get("PIDFile");
340 if ((fh = fopen(file, "w")) == NULL) {
342 ERROR("fopen (%s): %s", file, sstrerror(errno, errbuf, sizeof(errbuf)));
346 fprintf(fh, "%i\n", (int)getpid());
350 } /* static int pidfile_create (const char *file) */
352 static int pidfile_remove(void) {
353 const char *file = global_option_get("PIDFile");
358 } /* static int pidfile_remove (const char *file) */
359 #endif /* COLLECT_DAEMON */
362 static int notify_upstart(void) {
363 char const *upstart_job = getenv("UPSTART_JOB");
365 if (upstart_job == NULL)
368 if (strcmp(upstart_job, "collectd") != 0) {
369 WARNING("Environment specifies unexpected UPSTART_JOB=\"%s\", expected "
370 "\"collectd\". Ignoring the variable.",
375 NOTICE("Upstart detected, stopping now to signal readyness.");
377 unsetenv("UPSTART_JOB");
382 static int notify_systemd(void) {
384 const char *notifysocket;
385 struct sockaddr_un su = {0};
387 char buffer[] = "READY=1\n";
389 notifysocket = getenv("NOTIFY_SOCKET");
390 if (notifysocket == NULL)
393 if ((strlen(notifysocket) < 2) ||
394 ((notifysocket[0] != '@') && (notifysocket[0] != '/'))) {
395 ERROR("invalid notification socket NOTIFY_SOCKET=\"%s\": path must be "
400 NOTICE("Systemd detected, trying to signal readyness.");
402 unsetenv("NOTIFY_SOCKET");
404 #if defined(SOCK_CLOEXEC)
405 fd = socket(AF_UNIX, SOCK_DGRAM | SOCK_CLOEXEC, /* protocol = */ 0);
407 fd = socket(AF_UNIX, SOCK_DGRAM, /* protocol = */ 0);
411 ERROR("creating UNIX socket failed: %s",
412 sstrerror(errno, errbuf, sizeof(errbuf)));
416 su.sun_family = AF_UNIX;
417 if (notifysocket[0] != '@') {
418 /* regular UNIX socket */
419 sstrncpy(su.sun_path, notifysocket, sizeof(su.sun_path));
420 su_size = sizeof(su);
422 /* Linux abstract namespace socket: specify address as "\0foo", i.e.
423 * start with a null byte. Since null bytes have no special meaning in
424 * that case, we have to set su_size correctly to cover only the bytes
425 * that are part of the address. */
426 sstrncpy(su.sun_path, notifysocket, sizeof(su.sun_path));
428 su_size = sizeof(sa_family_t) + strlen(notifysocket);
429 if (su_size > sizeof(su))
430 su_size = sizeof(su);
433 if (sendto(fd, buffer, strlen(buffer), MSG_NOSIGNAL, (void *)&su,
434 (socklen_t)su_size) < 0) {
436 ERROR("sendto(\"%s\") failed: %s", notifysocket,
437 sstrerror(errno, errbuf, sizeof(errbuf)));
442 unsetenv("NOTIFY_SOCKET");
446 #endif /* KERNEL_LINUX */
448 int main(int argc, char **argv) {
449 const char *configfile = CONFIGFILE;
451 int test_readall = 0;
453 _Bool opt_create_basedir = 1;
464 c = getopt(argc, argv, "BhtTC:"
475 opt_create_basedir = 0;
485 global_option_set("ReadThreads", "-1", 1);
488 #endif /* COLLECT_DAEMON */
492 global_option_set("PIDFile", optarg, 1);
497 #endif /* COLLECT_DAEMON */
512 * Read options from the config file, the environment and the command
513 * line (in that order, with later options overwriting previous ones in
515 * Also, this will automatically load modules.
517 if (cf_read(configfile)) {
518 fprintf(stderr, "Error: Reading the config file failed!\n"
519 "Read the logs for details.\n");
524 * Change directory. We do this _after_ reading the config and loading
525 * modules to relative paths work as expected.
527 if ((basedir = global_option_get("BaseDir")) == NULL) {
529 "Don't have a basedir to use. This should not happen. Ever.");
531 } else if (change_basedir(basedir, opt_create_basedir)) {
532 fprintf(stderr, "Error: Unable to change to directory `%s'.\n", basedir);
537 * Set global variables or, if that failes, exit. We cannot run with
538 * them being uninitialized. If nothing is configured, then defaults
539 * are being used. So this means that the user has actually done
542 if (init_global_variables() != 0)
552 struct sigaction sig_chld_action = {.sa_handler = SIG_IGN};
554 sigaction(SIGCHLD, &sig_chld_action, NULL);
557 * Only daemonize if we're not being supervised
558 * by upstart or systemd (when using Linux).
562 && notify_upstart() == 0 && notify_systemd() == 0
567 if ((pid = fork()) == -1) {
570 fprintf(stderr, "fork: %s", sstrerror(errno, errbuf, sizeof(errbuf)));
572 } else if (pid != 0) {
574 /* printf ("Running (PID %i)\n", pid); */
578 /* Detach from session */
582 if (pidfile_create())
585 /* close standard descriptors */
590 status = open("/dev/null", O_RDWR);
592 ERROR("Error: Could not connect `STDIN' to `/dev/null' (status %d)",
599 ERROR("Error: Could not connect `STDOUT' to `/dev/null' (status %d)",
606 ERROR("Error: Could not connect `STDERR' to `/dev/null', (status %d)",
610 } /* if (config.daemonize) */
611 #endif /* COLLECT_DAEMON */
613 struct sigaction sig_pipe_action = {.sa_handler = SIG_IGN};
615 sigaction(SIGPIPE, &sig_pipe_action, NULL);
618 * install signal handlers
620 struct sigaction sig_int_action = {.sa_handler = sig_int_handler};
622 if (0 != sigaction(SIGINT, &sig_int_action, NULL)) {
624 ERROR("Error: Failed to install a signal handler for signal INT: %s",
625 sstrerror(errno, errbuf, sizeof(errbuf)));
629 struct sigaction sig_term_action = {.sa_handler = sig_term_handler};
631 if (0 != sigaction(SIGTERM, &sig_term_action, NULL)) {
633 ERROR("Error: Failed to install a signal handler for signal TERM: %s",
634 sstrerror(errno, errbuf, sizeof(errbuf)));
638 struct sigaction sig_usr1_action = {.sa_handler = sig_usr1_handler};
640 if (0 != sigaction(SIGUSR1, &sig_usr1_action, NULL)) {
642 ERROR("Error: Failed to install a signal handler for signal USR1: %s",
643 sstrerror(errno, errbuf, sizeof(errbuf)));
648 * run the actual loops
650 if (do_init() != 0) {
651 ERROR("Error: one or more plugin init callbacks failed.");
656 if (plugin_read_all_once() != 0) {
657 ERROR("Error: one or more plugin read callbacks failed.");
661 INFO("Initialization complete, entering read-loop.");
666 INFO("Exiting normally.");
668 if (do_shutdown() != 0) {
669 ERROR("Error: one or more plugin shutdown callbacks failed.");
674 if (config.daemonize)
676 #endif /* COLLECT_DAEMON */