php-src/ext/pcntl/php_signal.c

/*
   +----------------------------------------------------------------------+
   | PHP Version 5                                                        |
   +----------------------------------------------------------------------+
   | Copyright (c) 1997-2007 The PHP Group                                |
   +----------------------------------------------------------------------+
   | This source file is subject to version 3.01 of the PHP license,      |
   | that is bundled with this package in the file LICENSE, and is        |
   | available through the world-wide-web at the following url:           |
   | http://www.php.net/license/3_01.txt                                  |
   | If you did not receive a copy of the PHP license and are unable to   |
   | obtain it through the world-wide-web, please send a note to          |
   | license@php.net so we can mail you a copy immediately.               |
   +----------------------------------------------------------------------+
   | Author: Jason Greene <jason@inetgurus.net>                           |
   +----------------------------------------------------------------------+
*/

/* $Id$ */

#include "php_signal.h"

/* php_signal using sigaction is derrived from Advanced Programing
 * in the Unix Environment by W. Richard Stevens p 298. */
Sigfunc *php_signal(int signo, Sigfunc *func, int restart)
{
 
	struct sigaction act,oact;
	act.sa_handler = func;
	sigemptyset(&act.sa_mask);
	act.sa_flags = 0;
	if (signo == SIGALRM || (! restart)) {
#ifdef SA_INTERRUPT
		act.sa_flags |= SA_INTERRUPT; /* SunOS */
#endif
	} else {
#ifdef SA_RESTART
		act.sa_flags |= SA_RESTART; /* SVR4, 4.3+BSD */
#endif
	}
	if (sigaction(signo, &act, &oact) < 0)
		return SIG_ERR;
 
	return oact.sa_handler;
}