/* main ===================================================================== */
int
main (int argc, char **argv) {
vLogInit (LOG_UPTO (TEMPLATE_LOG_LEVEL));
// Read arguments from the command line
setting = gxPLSettingFromCommandArgs (argc, argv, gxPLConnectViaHub);
if (setting == NULL) {
PERROR ("Unable to get settings from command line");
exit (EXIT_FAILURE);
}
vLogSetMask (LOG_UPTO (setting->log));
// Now we detach (daemonize ourself)
if (setting->nodaemon == 0) {
vLogDaemonize (true);
// Fork ourselves
switch (fork()) {
case 0: // child
// Close standard I/O and become our own process group
close (fileno (stdin));
close (fileno (stdout));
close (fileno (stderr));
setpgrp();
// Start the daemon and keep it running
prvDaemon (setting);
break;
default: // parent
break;
case -1: // error
PERROR ("unable to spawn daemon supervisor, %s (%d)",
strerror (errno), errno);
exit (EXIT_FAILURE);
}
}
else {
// When running non-detached, start the main task
vMain (setting);
}
return 0;
}
// -----------------------------------------------------------------------------
// Start the daemon and monitor it. If it stops for any reason, restart it
static void
prvDaemon (gxPLSetting * setting) {
int daemon_restart_count = 0;
int ret;
setting->malloc = 0; // the settings are not to be freed at the network closure
// Begin daemon supervision
// Install signal traps for proper shutdown
signal (SIGTERM, prvDaemonSignalHandler);
signal (SIGINT, prvDaemonSignalHandler);
// To supervise the daemon, we repeatedly fork ourselves each time we
// determine the daemon is not running. We maintain a circuit breaker
// to prevent an endless spawning if the daemon just can't run
for (;;) {
// See if we can still do this
if (daemon_restart_count == MAX_DAEMON_RESTARTS) {
PERROR ("template has died %d times -- something may be wrong "
"-- terminating supervisor", MAX_DAEMON_RESTARTS);
exit (EXIT_FAILURE);
}
// Up the restart count
daemon_restart_count++;
// Fork off the daemon
switch (daemon_pid = fork()) {
case 0: // child
// Close standard I/O and become our own process group
close (fileno (stdin));
close (fileno (stdout));
close (fileno (stderr));
setpgrp();
// start the main task
vMain (setting);
break;
default: // parent
PINFO ("spawned template process, pid=%d, spawn count=%d",
daemon_pid, daemon_restart_count);
break;
case -1: // error
PERROR ("unable to spawn template-daemon supervisor, %s (%d)",
strerror (errno), errno);
exit (EXIT_FAILURE);
}
// Now we just wait for something bad to happen to our daemon
waitpid (daemon_pid, &ret, 0);
if (WIFEXITED (ret)) {
PNOTICE ("template exited normally with status %d -- restarting...",
WEXITSTATUS (ret));
continue;
}
if (WIFSIGNALED (ret)) {
PNOTICE ("template died from by receiving unexpected signal %d"
" -- restarting...", WTERMSIG (ret));
continue;
}
PNOTICE ("template died from unknown causes -- restarting...");
continue;
}
}
void Inserter::main(){
vMain();
}
