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/* $Id: signal_handler.c 2423 2010-03-13 07:09:49Z aturner $ */
/*
* Copyright (c) 2001-2010 Aaron Turner
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the names of the copyright owners nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
* IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "defines.h"
#include "common.h"
#include <signal.h>
#include <sys/time.h>
#include <stdio.h>
#include <sys/types.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include "tcpreplay.h"
#include "signal_handler.h"
struct timeval suspend_time;
static struct timeval suspend_start;
static struct timeval suspend_end;
/**
* init_signal_handlers -
* Initialize signal handlers to be used in tcpreplay.
*/
void
init_signal_handlers()
{
signal(SIGUSR1, suspend_handler);
signal(SIGCONT, continue_handler);
reset_suspend_time();
}
/**
* reset_suspend_time -
* Reset time values for suspend signal.
*/
void
reset_suspend_time()
{
timerclear(&suspend_time);
timerclear(&suspend_start);
timerclear(&suspend_end);
}
/**
* suspend signal handler -
* Signal handler for signal SIGUSR1. SIGSTOP cannot be
* caught, so SIGUSR1 is caught and it throws SIGSTOP.
*/
void
suspend_handler(int signo)
{
if (signo != SIGUSR1) {
warnx("suspend_handler() got the wrong signal: %d", signo);
return;
}
if (gettimeofday(&suspend_start, NULL) < 0)
errx(-1, "gettimeofday(): %s", strerror(errno));
kill(getpid(), SIGSTOP);
}
/**
* continue_handler -
* Signal handler for continue signal.
*/
void
continue_handler(int signo)
{
struct timeval suspend_delta;
if (signo != SIGCONT) {
warnx("continue_handler() got the wrong signal: %d", signo);
return;
}
if (gettimeofday(&suspend_end, NULL) < 0)
errx(-1, "gettimeofday(): %s", strerror(errno));
timersub(&suspend_end, &suspend_start, &suspend_delta);
timeradd(&suspend_time, &suspend_delta, &suspend_time);
}
/*
Local Variables:
mode:c
indent-tabs-mode:nil
c-basic-offset:4
End:
*/
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