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114 lines
2.9 KiB
114 lines
2.9 KiB
/*
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* Copyright 2002-2019 Intel Corporation.
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*
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* This software is provided to you as Sample Source Code as defined in the accompanying
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* End User License Agreement for the Intel(R) Software Development Products ("Agreement")
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* section 1.L.
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*
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* This software and the related documents are provided as is, with no express or implied
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* warranties, other than those that are expressly stated in the License.
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*/
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <unistd.h>
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#include <cstdio>
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#include <cstdlib>
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#include <sched.h>
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#include <signal.h>
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#include <errno.h>
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#include "../Utils/threadlib.h"
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#define TIMEOUT 20
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#define NUM_TH 4
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/*
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* This application is part of the test: "fork_hang.test" ". This test checks that no deadlock has occured when
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* child process tries to acquire the VM lock in a post fork callback in this child process.
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*
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* It also tests behavior when a multi-threaded app forks and doesn't execv.
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*/
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enum RESULT {
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RES_SUCCESS = 0,
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RES_FORK_FAILED,
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RES_TIMEOUT,
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RES_WAITPID_FAILED
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};
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bool alarmRinged = false;
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/*
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* A signal handler for SIGALRM
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*/
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void SigAlrmHandler( int signum, siginfo_t *siginfo, void *uctxt)
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{
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alarmRinged = true;
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}
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void * InfiniteLoop(void *ptr)
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{
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for(;;);
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}
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int main() {
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/* Register the signal handler */
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struct sigaction sSigaction;
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sSigaction.sa_sigaction = SigAlrmHandler;
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sigaction(SIGALRM, &sSigaction, NULL);
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THREAD_HANDLE threads[MAXTHREADS];
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for (int i = 0; i < NUM_TH; i++)
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CreateOneThread(&threads[i], InfiniteLoop, NULL);
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pid_t child = fork();
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if (child < 0)
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{
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fprintf(stderr, "FAILED: unable to create the child process\n");
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exit(RES_FORK_FAILED);
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}
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if (child > 0)
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{
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//in parent
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alarm(TIMEOUT); //send SIGALRM after TIMEOUT second.
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while(1)
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{
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if (waitpid(child, 0, 0) < 0)
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{
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// waitpid failed
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if (errno == EINTR)
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{
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// failure was due to a signal
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if (!alarmRinged) continue; // signal was not SIGALRM - continue to wait
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// signal was SIGALRM - kill the child to avoid a hung test and exit
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fprintf(stderr, "FAILED: the TIMEOUT has passed and the child process didn't terminate\n");
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kill(child, 9);
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exit(RES_TIMEOUT);
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}
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else
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{
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// failure was due to an unexpected reason
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fprintf(stderr, "FAILED: waitpid failed unexpectedly\n");
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exit(RES_WAITPID_FAILED);
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}
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}
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else
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{
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// waitpid succeeded - child exited normally
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break;
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}
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}
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}
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if (child == 0)
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{
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// child does nothing
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}
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return RES_SUCCESS;
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}
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