void _logeater_handle_signal_if_needed(void)
{
int signo;
if ( ! got_signal )
return;
signo = got_signal;
got_signal = 0;
#if !((defined _WIN32 || defined __WIN32__) && !defined __CYGWIN__)
if ( signo == SIGQUIT || signo == SIGUSR1 ) {
handle_sigquit();
return;
}
#endif
server_close();
if ( config.logeater_client )
requiem_client_destroy(config.logeater_client, REQUIEM_CLIENT_EXIT_STATUS_FAILURE);
requiem_deinit();
#if !((defined _WIN32 || defined __WIN32__) && !defined __CYGWIN__)
if ( signo == SIGHUP ) {
requiem_log(REQUIEM_LOG_WARN, "signal %d received, restarting (%s).\n", signo, get_restart_string());
handle_sighup();
}
#endif
requiem_log(REQUIEM_LOG_WARN, "signal %d received, terminating requiem-logeater.\n", signo);
exit(2);
}
void _lml_handle_signal_if_needed(void)
{
int signo;
if ( ! got_signal )
return;
signo = got_signal;
got_signal = 0;
#if !((defined _WIN32 || defined __WIN32__) && !defined __CYGWIN__)
if ( signo == SIGQUIT || signo == SIGUSR1 ) {
handle_sigquit();
return;
}
#endif
server_close();
if ( config.lml_client )
prelude_client_destroy(config.lml_client, PRELUDE_CLIENT_EXIT_STATUS_FAILURE);
prelude_deinit();
#if !((defined _WIN32 || defined __WIN32__) && !defined __CYGWIN__)
if ( signo == SIGHUP ) {
prelude_log(PRELUDE_LOG_WARN, "signal %d received, restarting (%s).\n", signo, get_restart_string());
handle_sighup();
}
#endif
prelude_log(PRELUDE_LOG_WARN, "signal %d received, terminating prelude-lml.\n", signo);
exit(2);
}
void check_signals(void)
{
if (mf_sigchld) handle_sigchld();
if (mf_sigalrm) handle_sigalrm();
if (mf_sigint) handle_sigint();
if (mf_sigquit) handle_sigquit();
if (mf_sigterm) handle_sigterm();
if (mf_sigpipe) handle_sigpipe();
if (mf_sigusr1) handle_sigusr1();
if (mf_sigusr2) handle_sigusr2();
if (mf_sighup) handle_sighup();
if (mf_stupid)
{
syslog(LOG_ERR,"set a signal handler,but forgot to write code to handle it");
mf_stupid = 0;
}
}
int main(int argc, char *argv[])
{
double interval;
int fd, rc;
reload_pending = 0;
sym_names_count = sizeof(sym_names) / sizeof(struct symbol_names);
varinfo_size = VARINFO_SIZE;
varinfo = calloc(varinfo_size, 1);
if (!varinfo) {
cpuplugd_error("Out of memory: varinfo\n");
exit(1);
}
/*
* varinfo must start with '\n' for correct string matching
* in get_var_rvalue().
*/
varinfo[0] = '\n';
/* Parse the command line options */
parse_options(argc, argv);
/* flock() lock file to prevent multiple instances of cpuplugd */
fd = open(LOCKFILE, O_CREAT | O_RDONLY, S_IRUSR);
if (fd == -1) {
cpuplugd_error("Cannot open lock file %s: %s\n", LOCKFILE,
strerror(errno));
exit(1);
}
rc = flock(fd, LOCK_EX | LOCK_NB);
if (rc) {
cpuplugd_error("flock() failed on lock file %s: %s\nThis might "
"indicate that an instance of this daemon is "
"already running.\n", LOCKFILE, strerror(errno));
exit(1);
}
/* Make sure that the daemon is not started multiple times */
check_if_started_twice();
/* Store daemon pid also in foreground mode */
handle_signals();
handle_sighup();
/* Need 1 history level minimum for internal symbols */
history_max = 1;
/*
* Parse arguments from the configuration file, also calculate
* history_max
*/
parse_configfile(configfile);
if (history_max > MAX_HISTORY)
cpuplugd_exit("History depth %i exceeded maximum (%i)\n",
history_max, MAX_HISTORY);
/* Check the settings in the configuration file */
check_config();
if (!foreground) {
rc = daemon(1, 0);
if (rc < 0)
cpuplugd_exit("Detach from terminal failed: %s\n",
strerror(errno));
}
/* Store daemon pid */
store_pid();
/* Unlock lock file */
flock(fd, LOCK_UN);
close(fd);
/* Install signal handler for floating point exceptions */
rc = feenableexcept(FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW |
FE_INVALID);
act.sa_flags = SA_NODEFER;
sigemptyset(&act.sa_mask);
act.sa_handler = sigfpe_handler;
if (sigaction(SIGFPE, &act, NULL) < 0)
cpuplugd_exit("sigaction( SIGFPE, ... ) failed - reason %s\n",
strerror(errno));
setup_history();
/* Main loop */
while (1) {
if (reload_pending) { // check for daemon reload
reload_daemon();
reload_pending = 0;
}
history_prev = history_current;
history_current = (history_current + 1) % (history_max + 1);
time_read(×tamps[history_current]);
proc_read(meminfo + history_current * meminfo_size,
"/proc/meminfo", meminfo_size);
proc_read(vmstat + history_current * vmstat_size,
"/proc/vmstat", vmstat_size);
proc_cpu_read(cpustat + history_current * cpustat_size);
interval = timestamps[history_current] -
timestamps[history_prev];
cpuplugd_debug("config update interval: %ld seconds\n",
cfg.update);
cpuplugd_debug("real update interval: %f seconds\n", interval);
/* Run code that may signal failure via longjmp. */
if (cpu == 1) {
if (setjmp(jmpenv) == 0)
eval_cpu_rules();
else
cpuplugd_error("Floating point exception, "
"skipping cpu rule "
"evaluation.\n");
}
if (memory == 1) {
if (setjmp(jmpenv) == 0)
eval_mem_rules(interval);
else
cpuplugd_error("Floating point exception, "
"skipping memory rule "
"evaluation.\n");
}
sleep(cfg.update);
}
return 0;
}
