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termSig.c
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termSig.c
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/* termSig.c
*
* call epicsExitCallAtExits() even when ioc terminates with a signal (e.g. CTRL-C)
*
* Copyright (C) 2018 Dirk Zimoch
*
* 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 3 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, see <https://www.gnu.org/licenses/>.
*/
#define _GNU_SOURCE 1
#include <string.h>
#include <stdio.h>
#include <signal.h>
#include "errlog.h"
#include "epicsExit.h"
#include "epicsExport.h"
int termSigDebug = 0;
epicsExportAddress(int, termSigDebug);
#ifndef vxWorks
struct sigaction old_handler_SIGHUP;
struct sigaction old_handler_SIGINT;
struct sigaction old_handler_SIGPIPE;
struct sigaction old_handler_SIGALRM;
struct sigaction old_handler_SIGTERM;
struct sigaction old_handler_SIGUSR1;
struct sigaction old_handler_SIGUSR2;
void termSigHandler(int sig, siginfo_t* info , void* ctx)
{
/* try to clean up before exit */
if (termSigDebug)
errlogPrintf("\nSignal %s (%d)\n", strsignal(sig), sig);
/* restore original handlers */
sigaction(SIGHUP, &old_handler_SIGHUP, NULL);
sigaction(SIGINT, &old_handler_SIGINT, NULL);
sigaction(SIGPIPE, &old_handler_SIGPIPE, NULL);
sigaction(SIGALRM, &old_handler_SIGALRM, NULL);
sigaction(SIGTERM, &old_handler_SIGTERM, NULL);
sigaction(SIGUSR1, &old_handler_SIGUSR1, NULL);
sigaction(SIGUSR2, &old_handler_SIGUSR2, NULL);
epicsExitCallAtExits(); /* will only start executing handlers once */
/* send the same signal again */
raise(sig);
}
#endif
static void termSigExitFunc(void* arg)
{
if (termSigDebug)
errlogPrintf("Exit handlers executing\n");
}
static void termSigRegistrar (void)
{
#ifndef vxWorks
struct sigaction sa = {{0}};
/* make sure that exit handlers are called even at signal termination (e,g CTRL-C) */
sa.sa_sigaction = termSigHandler;
sa.sa_flags = SA_SIGINFO;
sigaction(SIGHUP, &sa, &old_handler_SIGHUP);
sigaction(SIGINT, &sa, &old_handler_SIGINT);
sigaction(SIGPIPE, &sa, &old_handler_SIGPIPE);
sigaction(SIGALRM, &sa, &old_handler_SIGALRM);
sigaction(SIGTERM, &sa, &old_handler_SIGTERM);
sigaction(SIGUSR1, &sa, &old_handler_SIGUSR1);
sigaction(SIGUSR2, &sa, &old_handler_SIGUSR2);
#endif
epicsAtExit(termSigExitFunc, NULL);
}
epicsExportRegistrar(termSigRegistrar);