Function sigTermHandler

src/bin/pg_dump/parallel.c:549–607

* Signal handler (Unix only) */

 * Signal handler (Unix only)
 */
static void
sigTermHandler(SIGNAL_ARGS)
{
	int			i;
	char		errbuf[1];

	/*
	 * Some platforms allow delivery of new signals to interrupt an active
	 * signal handler.  That could muck up our attempt to send PQcancel, so
	 * disable the signals that setup_cancel_handler enabled.
	 */
	pqsignal(SIGINT, SIG_IGN);
	pqsignal(SIGTERM, SIG_IGN);
	pqsignal(SIGQUIT, SIG_IGN);

	/*
	 * If we're in the leader, forward signal to all workers.  (It seems best
	 * to do this before PQcancel; killing the leader transaction will result
	 * in invalid-snapshot errors from active workers, which maybe we can
	 * quiet by killing workers first.)  Ignore any errors.
	 */
	if (signal_info.pstate != NULL)
	{
		for (i = 0; i < signal_info.pstate->numWorkers; i++)
		{
			pid_t		pid = signal_info.pstate->parallelSlot[i].pid;

			if (pid != 0)
				kill(pid, SIGTERM);
		}
	}

	/*
	 * Send QueryCancel if we have a connection to send to.  Ignore errors,
	 * there's not much we can do about them anyway.
	 */
	if (signal_info.myAH != NULL && signal_info.myAH->connCancel != NULL)
		(void) PQcancel(signal_info.myAH->connCancel, errbuf, sizeof(errbuf));

	/*
	 * Report we're quitting, using nothing more complicated than write(2).
	 * When in parallel operation, only the leader process should do this.
	 */
	if (!signal_info.am_worker)
	{
		if (progname)
		{
			write_stderr(progname);
			write_stderr(": ");
		}
		write_stderr("terminated by user\n");
	}

	/*
	 * And die, using _exit() not exit() because the latter will invoke atexit
	 * handlers that can fail if we interrupted related code.
	 */
	_exit(1);