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/* ========================================================================
* Copyright 1988-2006 University of Washington
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
*
* ========================================================================
*/
/*
* Program: POSIX Signals
*
* Author: Mark Crispin
* Networks and Distributed Computing
* Computing & Communications
* University of Washington
* Administration Building, AG-44
* Seattle, WA 98195
* Internet: MRC@CAC.Washington.EDU
*
* Date: 29 April 1997
* Last Edited: 30 August 2006
*/
#include <signal.h>
#include <string.h>
#ifndef SA_RESTART
#define SA_RESTART 0
#endif
/* Arm a signal
* Accepts: signal number
* desired action
* Returns: old action
*/
void *arm_signal (int sig,void *action)
{
struct sigaction nact,oact;
memset (&nact,0,sizeof (struct sigaction));
sigemptyset (&nact.sa_mask); /* no signals blocked */
nact.sa_handler = action; /* set signal handler */
nact.sa_flags = SA_RESTART; /* needed on Linux, nice on SVR4 */
sigaction (sig,&nact,&oact); /* do the signal action */
return (void *) oact.sa_handler;
}
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