Function interactive_getc

src/backend/tcop/postgres.c:420–442

* interactive_getc -- collect one character from stdin * * Even though we are not reading from a "client" process, we still want to * respond to signals, particularly SIGTERM/SIGQUIT. */

 * respond to signals, particularly SIGTERM/SIGQUIT.
 */
static int
interactive_getc(void)
{
	int			c;

	/*
	 * This will not process catchup interrupts or notifications while
	 * reading. But those can't really be relevant for a standalone backend
	 * anyway. To properly handle SIGTERM there's a hack in die() that
	 * directly processes interrupts at this stage...
	 */
	CHECK_FOR_INTERRUPTS();

	enable_client_wait_timeout_interrupt();

	c = getc(stdin);

	disable_client_wait_timeout_interrupt();

	ProcessClientReadInterrupt(false);

	return c;
}

/* ----------------
 *	SocketBackend()		Is called for frontend-backend connections