+++ /dev/null
-/**
- * collectd - src/collectd.c
- * Copyright (C) 2005-2007 Florian octo Forster
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; only version 2 of the License is applicable.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- *
- * Authors:
- * Florian octo Forster <octo at verplant.org>
- * Alvaro Barcellos <alvaro.barcellos at gmail.com>
- **/
-
-#include "collectd.h"
-#include "common.h"
-
-#include <sys/types.h>
-#include <sys/socket.h>
-#include <netdb.h>
-
-#include <pthread.h>
-
-#include "plugin.h"
-#include "configfile.h"
-
-#if HAVE_STATGRAB_H
-# include <statgrab.h>
-#endif
-
-/*
- * Global variables
- */
-char hostname_g[DATA_MAX_NAME_LEN];
-cdtime_t interval_g;
-int timeout_g;
-#if HAVE_LIBKSTAT
-kstat_ctl_t *kc;
-#endif /* HAVE_LIBKSTAT */
-
-static int loop = 0;
-
-static void *do_flush (void __attribute__((unused)) *arg)
-{
- INFO ("Flushing all data.");
- plugin_flush (/* plugin = */ NULL,
- /* timeout = */ 0,
- /* ident = */ NULL);
- INFO ("Finished flushing all data.");
- pthread_exit (NULL);
- return NULL;
-}
-
-static void sig_int_handler (int __attribute__((unused)) signal)
-{
- loop++;
-}
-
-static void sig_term_handler (int __attribute__((unused)) signal)
-{
- loop++;
-}
-
-static void sig_usr1_handler (int __attribute__((unused)) signal)
-{
- pthread_t thread;
- pthread_attr_t attr;
-
- /* flushing the data might take a while,
- * so it should be done asynchronously */
- pthread_attr_init (&attr);
- pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
- pthread_create (&thread, &attr, do_flush, NULL);
- pthread_attr_destroy (&attr);
-}
-
-static int init_hostname (void)
-{
- const char *str;
-
- struct addrinfo ai_hints;
- struct addrinfo *ai_list;
- struct addrinfo *ai_ptr;
- int status;
-
- str = global_option_get ("Hostname");
- if (str != NULL)
- {
- sstrncpy (hostname_g, str, sizeof (hostname_g));
- return (0);
- }
-
- if (gethostname (hostname_g, sizeof (hostname_g)) != 0)
- {
- fprintf (stderr, "`gethostname' failed and no "
- "hostname was configured.\n");
- return (-1);
- }
-
- str = global_option_get ("FQDNLookup");
- if (IS_FALSE (str))
- return (0);
-
- memset (&ai_hints, '\0', sizeof (ai_hints));
- ai_hints.ai_flags = AI_CANONNAME;
-
- status = getaddrinfo (hostname_g, NULL, &ai_hints, &ai_list);
- if (status != 0)
- {
- ERROR ("Looking up \"%s\" failed. You have set the "
- "\"FQDNLookup\" option, but I cannot resolve "
- "my hostname to a fully qualified domain "
- "name. Please fix the network "
- "configuration.", hostname_g);
- return (-1);
- }
-
- for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
- {
- if (ai_ptr->ai_canonname == NULL)
- continue;
-
- sstrncpy (hostname_g, ai_ptr->ai_canonname, sizeof (hostname_g));
- break;
- }
-
- freeaddrinfo (ai_list);
- return (0);
-} /* int init_hostname */
-
-static int init_global_variables (void)
-{
- char const *str;
-
- interval_g = cf_get_default_interval ();
- assert (interval_g > 0);
- DEBUG ("interval_g = %.3f;", CDTIME_T_TO_DOUBLE (interval_g));
-
- str = global_option_get ("Timeout");
- if (str == NULL)
- str = "2";
- timeout_g = atoi (str);
- if (timeout_g <= 1)
- {
- fprintf (stderr, "Cannot set the timeout to a correct value.\n"
- "Please check your settings.\n");
- return (-1);
- }
- DEBUG ("timeout_g = %i;", timeout_g);
-
- if (init_hostname () != 0)
- return (-1);
- DEBUG ("hostname_g = %s;", hostname_g);
-
- return (0);
-} /* int init_global_variables */
-
-static int change_basedir (const char *orig_dir)
-{
- char *dir;
- size_t dirlen;
- int status;
-
- dir = strdup (orig_dir);
- if (dir == NULL)
- {
- char errbuf[1024];
- ERROR ("strdup failed: %s",
- sstrerror (errno, errbuf, sizeof (errbuf)));
- return (-1);
- }
-
- dirlen = strlen (dir);
- while ((dirlen > 0) && (dir[dirlen - 1] == '/'))
- dir[--dirlen] = '\0';
-
- if (dirlen <= 0)
- return (-1);
-
- status = chdir (dir);
- if (status == 0)
- {
- free (dir);
- return (0);
- }
- else if (errno != ENOENT)
- {
- char errbuf[1024];
- ERROR ("change_basedir: chdir (%s): %s", dir,
- sstrerror (errno, errbuf, sizeof (errbuf)));
- free (dir);
- return (-1);
- }
-
- status = mkdir (dir, S_IRWXU | S_IRWXG | S_IRWXO);
- if (status != 0)
- {
- char errbuf[1024];
- ERROR ("change_basedir: mkdir (%s): %s", dir,
- sstrerror (errno, errbuf, sizeof (errbuf)));
- free (dir);
- return (-1);
- }
-
- status = chdir (dir);
- if (status != 0)
- {
- char errbuf[1024];
- ERROR ("change_basedir: chdir (%s): %s", dir,
- sstrerror (errno, errbuf, sizeof (errbuf)));
- free (dir);
- return (-1);
- }
-
- free (dir);
- return (0);
-} /* static int change_basedir (char *dir) */
-
-#if HAVE_LIBKSTAT
-static void update_kstat (void)
-{
- if (kc == NULL)
- {
- if ((kc = kstat_open ()) == NULL)
- ERROR ("Unable to open kstat control structure");
- }
- else
- {
- kid_t kid;
- kid = kstat_chain_update (kc);
- if (kid > 0)
- {
- INFO ("kstat chain has been updated");
- plugin_init_all ();
- }
- else if (kid < 0)
- ERROR ("kstat chain update failed");
- /* else: everything works as expected */
- }
-
- return;
-} /* static void update_kstat (void) */
-#endif /* HAVE_LIBKSTAT */
-
-/* TODO
- * Remove all settings but `-f' and `-C'
- */
-static void exit_usage (int status)
-{
- printf ("Usage: "PACKAGE" [OPTIONS]\n\n"
-
- "Available options:\n"
- " General:\n"
- " -C <file> Configuration file.\n"
- " Default: "CONFIGFILE"\n"
- " -t Test config and exit.\n"
- " -T Test plugin read and exit.\n"
- " -P <file> PID-file.\n"
- " Default: "PIDFILE"\n"
-#if COLLECT_DAEMON
- " -f Don't fork to the background.\n"
-#endif
- " -h Display help (this message)\n"
- "\nBuiltin defaults:\n"
- " Config file "CONFIGFILE"\n"
- " PID file "PIDFILE"\n"
- " Plugin directory "PLUGINDIR"\n"
- " Data directory "PKGLOCALSTATEDIR"\n"
- "\n"PACKAGE" "VERSION", http://collectd.org/\n"
- "by Florian octo Forster <octo@verplant.org>\n"
- "for contributions see `AUTHORS'\n");
- exit (status);
-} /* static void exit_usage (int status) */
-
-static int do_init (void)
-{
-#if HAVE_LIBKSTAT
- kc = NULL;
- update_kstat ();
-#endif
-
-#if HAVE_LIBSTATGRAB
- if (sg_init ())
- {
- ERROR ("sg_init: %s", sg_str_error (sg_get_error ()));
- return (-1);
- }
-
- if (sg_drop_privileges ())
- {
- ERROR ("sg_drop_privileges: %s", sg_str_error (sg_get_error ()));
- return (-1);
- }
-#endif
-
- plugin_init_all ();
-
- return (0);
-} /* int do_init () */
-
-
-static int do_loop (void)
-{
- cdtime_t interval = cf_get_default_interval ();
- cdtime_t wait_until;
-
- wait_until = cdtime () + interval;
-
- while (loop == 0)
- {
- struct timespec ts_wait = { 0, 0 };
- cdtime_t now;
-
-#if HAVE_LIBKSTAT
- update_kstat ();
-#endif
-
- /* Issue all plugins */
- plugin_read_all ();
-
- now = cdtime ();
- if (now >= wait_until)
- {
- WARNING ("Not sleeping because the next interval is "
- "%.3f seconds in the past!",
- CDTIME_T_TO_DOUBLE (now - wait_until));
- wait_until = now + interval;
- continue;
- }
-
- CDTIME_T_TO_TIMESPEC (wait_until - now, &ts_wait);
- wait_until = wait_until + interval;
-
- while ((loop == 0) && (nanosleep (&ts_wait, &ts_wait) != 0))
- {
- if (errno != EINTR)
- {
- char errbuf[1024];
- ERROR ("nanosleep failed: %s",
- sstrerror (errno, errbuf,
- sizeof (errbuf)));
- return (-1);
- }
- }
- } /* while (loop == 0) */
-
- return (0);
-} /* int do_loop */
-
-static int do_shutdown (void)
-{
- plugin_shutdown_all ();
- return (0);
-} /* int do_shutdown */
-
-#if COLLECT_DAEMON
-static int pidfile_create (void)
-{
- FILE *fh;
- const char *file = global_option_get ("PIDFile");
-
- if ((fh = fopen (file, "w")) == NULL)
- {
- char errbuf[1024];
- ERROR ("fopen (%s): %s", file,
- sstrerror (errno, errbuf, sizeof (errbuf)));
- return (1);
- }
-
- fprintf (fh, "%i\n", (int) getpid ());
- fclose(fh);
-
- return (0);
-} /* static int pidfile_create (const char *file) */
-
-static int pidfile_remove (void)
-{
- const char *file = global_option_get ("PIDFile");
-
- DEBUG ("unlink (%s)", (file != NULL) ? file : "<null>");
- return (unlink (file));
-} /* static int pidfile_remove (const char *file) */
-#endif /* COLLECT_DAEMON */
-
-int main (int argc, char **argv)
-{
- struct sigaction sig_int_action;
- struct sigaction sig_term_action;
- struct sigaction sig_usr1_action;
- struct sigaction sig_pipe_action;
- char *configfile = CONFIGFILE;
- int test_config = 0;
- int test_readall = 0;
- const char *basedir;
-#if COLLECT_DAEMON
- struct sigaction sig_chld_action;
- pid_t pid;
- int daemonize = 1;
-#endif
- int exit_status = 0;
-
- /* read options */
- while (1)
- {
- int c;
-
- c = getopt (argc, argv, "htTC:"
-#if COLLECT_DAEMON
- "fP:"
-#endif
- );
-
- if (c == -1)
- break;
-
- switch (c)
- {
- case 'C':
- configfile = optarg;
- break;
- case 't':
- test_config = 1;
- break;
- case 'T':
- test_readall = 1;
- global_option_set ("ReadThreads", "-1");
-#if COLLECT_DAEMON
- daemonize = 0;
-#endif /* COLLECT_DAEMON */
- break;
-#if COLLECT_DAEMON
- case 'P':
- global_option_set ("PIDFile", optarg);
- break;
- case 'f':
- daemonize = 0;
- break;
-#endif /* COLLECT_DAEMON */
- case 'h':
- exit_usage (0);
- break;
- default:
- exit_usage (1);
- } /* switch (c) */
- } /* while (1) */
-
- if (optind < argc)
- exit_usage (1);
-
- plugin_init_ctx ();
-
- /*
- * Read options from the config file, the environment and the command
- * line (in that order, with later options overwriting previous ones in
- * general).
- * Also, this will automatically load modules.
- */
- if (cf_read (configfile))
- {
- fprintf (stderr, "Error: Reading the config file failed!\n"
- "Read the syslog for details.\n");
- return (1);
- }
-
- /*
- * Change directory. We do this _after_ reading the config and loading
- * modules to relative paths work as expected.
- */
- if ((basedir = global_option_get ("BaseDir")) == NULL)
- {
- fprintf (stderr, "Don't have a basedir to use. This should not happen. Ever.");
- return (1);
- }
- else if (change_basedir (basedir))
- {
- fprintf (stderr, "Error: Unable to change to directory `%s'.\n", basedir);
- return (1);
- }
-
- /*
- * Set global variables or, if that failes, exit. We cannot run with
- * them being uninitialized. If nothing is configured, then defaults
- * are being used. So this means that the user has actually done
- * something wrong.
- */
- if (init_global_variables () != 0)
- return (1);
-
- if (test_config)
- return (0);
-
-#if COLLECT_DAEMON
- /*
- * fork off child
- */
- memset (&sig_chld_action, '\0', sizeof (sig_chld_action));
- sig_chld_action.sa_handler = SIG_IGN;
- sigaction (SIGCHLD, &sig_chld_action, NULL);
-
- if (daemonize)
- {
- if ((pid = fork ()) == -1)
- {
- /* error */
- char errbuf[1024];
- fprintf (stderr, "fork: %s",
- sstrerror (errno, errbuf,
- sizeof (errbuf)));
- return (1);
- }
- else if (pid != 0)
- {
- /* parent */
- /* printf ("Running (PID %i)\n", pid); */
- return (0);
- }
-
- /* Detach from session */
- setsid ();
-
- /* Write pidfile */
- if (pidfile_create ())
- exit (2);
-
- /* close standard descriptors */
- close (2);
- close (1);
- close (0);
-
- if (open ("/dev/null", O_RDWR) != 0)
- {
- ERROR ("Error: Could not connect `STDIN' to `/dev/null'");
- return (1);
- }
- if (dup (0) != 1)
- {
- ERROR ("Error: Could not connect `STDOUT' to `/dev/null'");
- return (1);
- }
- if (dup (0) != 2)
- {
- ERROR ("Error: Could not connect `STDERR' to `/dev/null'");
- return (1);
- }
- } /* if (daemonize) */
-#endif /* COLLECT_DAEMON */
-
- memset (&sig_pipe_action, '\0', sizeof (sig_pipe_action));
- sig_pipe_action.sa_handler = SIG_IGN;
- sigaction (SIGPIPE, &sig_pipe_action, NULL);
-
- /*
- * install signal handlers
- */
- memset (&sig_int_action, '\0', sizeof (sig_int_action));
- sig_int_action.sa_handler = sig_int_handler;
- if (0 != sigaction (SIGINT, &sig_int_action, NULL)) {
- char errbuf[1024];
- ERROR ("Error: Failed to install a signal handler for signal INT: %s",
- sstrerror (errno, errbuf, sizeof (errbuf)));
- return (1);
- }
-
- memset (&sig_term_action, '\0', sizeof (sig_term_action));
- sig_term_action.sa_handler = sig_term_handler;
- if (0 != sigaction (SIGTERM, &sig_term_action, NULL)) {
- char errbuf[1024];
- ERROR ("Error: Failed to install a signal handler for signal TERM: %s",
- sstrerror (errno, errbuf, sizeof (errbuf)));
- return (1);
- }
-
- memset (&sig_usr1_action, '\0', sizeof (sig_usr1_action));
- sig_usr1_action.sa_handler = sig_usr1_handler;
- if (0 != sigaction (SIGUSR1, &sig_usr1_action, NULL)) {
- char errbuf[1024];
- ERROR ("Error: Failed to install a signal handler for signal USR1: %s",
- sstrerror (errno, errbuf, sizeof (errbuf)));
- return (1);
- }
-
- /*
- * run the actual loops
- */
- do_init ();
-
- if (test_readall)
- {
- if (plugin_read_all_once () != 0)
- exit_status = 1;
- }
- else
- {
- INFO ("Initialization complete, entering read-loop.");
- do_loop ();
- }
-
- /* close syslog */
- INFO ("Exiting normally.");
-
- do_shutdown ();
-
-#if COLLECT_DAEMON
- if (daemonize)
- pidfile_remove ();
-#endif /* COLLECT_DAEMON */
-
- return (exit_status);
-} /* int main */
projects / collectd.git / blobdiff