/*
* Disktest
* Copyright (c) International Business Machines Corp., 2005
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* Please send e-mail to yardleyb@us.ibm.com if you have
* questions or comments.
*
* Project Website: TBD
*
* $Id: signals.c,v 1.1 2008/02/14 08:22:23 subrata_modak Exp $
*/
#ifdef WINDOWS
#include <windows.h>
#else
#include <pthread.h>
#endif
#include <signal.h>
#include "threading.h"
#include "signals.h"
/*
* global variable used to indicate what signal
* (if any) has been caught
*/
int handled_signal = -1;
int signal_action = SIGNAL_NONE;
/*
* mutex to be used whenever accessing the above
* global data
*/
#ifdef WINDOWS
HANDLE sig_mutex;
#else
pthread_mutex_t sig_mutex = PTHREAD_MUTEX_INITIALIZER;
#endif
#ifdef WINDOWS
void sig_handler(int sig)
#else
void *sig_handler(void *arg)
#endif
{
#ifndef WINDOWS
sigset_t signal_set;
int sig;
int rv;
/* wait for any and all signals */
sigfillset(&signal_set);
#ifdef AIX
/* except in AIX, can't sigwait on this signals */
sigdelset(&signal_set, SIGKILL);
sigdelset(&signal_set, SIGWAITING);
sigdelset(&signal_set, SIGSTOP);
#endif
for (;;) {
rv = sigwait(&signal_set, &sig);
#endif
switch (sig) {
case SIGQUIT:
LOCK(sig_mutex);
handled_signal = SIGQUIT;
signal_action |= SIGNAL_STOP;
UNLOCK(sig_mutex);
break;
case SIGINT:
LOCK(sig_mutex);
handled_signal = SIGINT;
signal_action |= SIGNAL_STOP;
UNLOCK(sig_mutex);
break;
case SIGTERM:
LOCK(sig_mutex);
handled_signal = SIGTERM;
signal_action |= SIGNAL_STOP;
UNLOCK(sig_mutex);
break;
case SIGHUP:
LOCK(sig_mutex);
handled_signal = SIGHUP;
signal_action |= SIGNAL_STOP;
UNLOCK(sig_mutex);
break;
case SIGUSR1:
LOCK(sig_mutex);
handled_signal = SIGUSR1;
signal_action |= SIGNAL_STAT;
UNLOCK(sig_mutex);
break;
/* whatever you need to do for other signals */
default:
LOCK(sig_mutex);
handled_signal = 0;
UNLOCK(sig_mutex);
break;
}
#ifndef WINDOWS
}
return NULL;
#endif
}
void setup_sig_mask(void)
{
#ifndef WINDOWS
sigset_t signal_set;
pthread_t sig_thread;
#endif
#ifdef WINDOWS
if ((sig_mutex = CreateMutex(NULL, FALSE, NULL)) == NULL) {
return;
}
#endif
/* block all signals */
#ifdef WINDOWS
signal(SIGINT, sig_handler);
signal(SIGTERM, sig_handler);
signal(SIGUSR1, sig_handler);
#else
sigemptyset(&signal_set);
sigaddset(&signal_set, SIGINT);
sigaddset(&signal_set, SIGHUP);
sigaddset(&signal_set, SIGQUIT);
sigaddset(&signal_set, SIGTERM);
sigaddset(&signal_set, SIGUSR1);
#ifdef AIX
sigthreadmask(SIG_SETMASK, &signal_set, NULL);
#else
pthread_sigmask(SIG_SETMASK, &signal_set, NULL);
#endif
/* create the signal handling thread */
pthread_create(&sig_thread, NULL, sig_handler, NULL);
#endif
}
void clear_stat_signal(void)
{
if (signal_action & SIGNAL_STAT) {
LOCK(sig_mutex);
signal_action &= ~SIGNAL_STAT;
UNLOCK(sig_mutex);
}
}