Function StartupProcessMain

src/backend/postmaster/startup.c:219–274

---------------------------------- * Startup Process main entry point * ---------------------------------- */

 * ----------------------------------
 */
void
StartupProcessMain(void)
{
	am_startup = true;
	/* Arrange to clean up at startup process exit */
	on_shmem_exit(StartupProcExit, 0);
	/*
	 * Properly accept or ignore signals the postmaster might send us.
	 */
	pqsignal(SIGHUP, StartupProcSigHupHandler); /* reload config file */
	pqsignal(SIGINT, SIG_IGN);	/* ignore query cancel */
	pqsignal(SIGTERM, StartupProcShutdownHandler);	/* request shutdown */
	/* SIGQUIT handler was already set up by InitPostmasterChild */
	InitializeTimeouts();		/* establishes SIGALRM handler */
	pqsignal(SIGPIPE, SIG_IGN);
	pqsignal(SIGUSR1, procsignal_sigusr1_handler);
	pqsignal(SIGUSR2, StartupProcTriggerHandler);

#ifdef SIGBUS
	pqsignal(SIGBUS, HandleCrash);
#endif
#ifdef SIGILL
    pqsignal(SIGILL, HandleCrash);
#endif
#ifdef SIGSEGV
	pqsignal(SIGSEGV, HandleCrash);
#endif

	/*
	 * Reset some signals that are accepted by postmaster but not here
	 */
	pqsignal(SIGCHLD, SIG_DFL);

	/*
	 * Register timeouts needed for standby mode
	 */
	RegisterTimeout(STANDBY_DEADLOCK_TIMEOUT, StandbyDeadLockHandler);
	RegisterTimeout(STANDBY_TIMEOUT, StandbyTimeoutHandler);
	RegisterTimeout(STANDBY_LOCK_TIMEOUT, StandbyLockTimeoutHandler);

	/*
	 * Unblock signals (they were blocked when the postmaster forked us)
	 */
	PG_SETMASK(&UnBlockSig);

	/*
	 * Do what we came for.
	 */
	StartupXLOG();

	/*
	 * Exit normally. Exit code 0 tells postmaster that we completed recovery
	 * successfully.
	 */
	proc_exit(0);
}

void