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/*
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*
*/
/** @file helper executable for WatchDogPlugin.cpp */
#include <sys/types.h>
#include <sys/time.h>
#include <signal.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <limits.h>
long timeout;
void killParent(int) {
::kill(getppid(), SIGKILL);
::fprintf(stderr, "Watchdog killed unresponsive broker, pid=%d\n", ::getppid());
::exit(1);
}
void resetTimer(int) {
struct ::itimerval itval = { { 0, 0 }, { timeout, 0 } };
if (::setitimer(ITIMER_REAL, &itval, 0) !=0) {
::perror("Watchdog failed to set timer");
killParent(0);
::exit(1);
}
}
/** Simple watchdog program: kill parent process if timeout
* expires without a SIGUSR1.
* Will be killed with SIGHUP when parent shuts down.
* Args: timeout in seconds.
*/
int main(int argc, char** argv) {
if(argc != 2 || (timeout = atoi(argv[1])) == 0) {
::fprintf(stderr, "Usage: %s <timeout_seconds>\n", argv[0]);
::exit(1);
}
::signal(SIGUSR1, resetTimer);
::signal(SIGALRM, killParent);
resetTimer(0);
while (true) { sleep(INT_MAX); }
}
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