CODEWITHSUNDEEP
clinuxsignalsforkwaitpid
user3088814
user3088814

Reputation: 31

getting exit status from child process in c

I can not figure out what I have wrong with this code. This is C on a linux box.

What it should do is kill all the child processes I created, wait for the all to quit and then print out a line for each child with the pid, process number (I create), and the signal number (should be a 9 for killed).

So what am I doing wrong?

void onalarm(int signo) {
    int status[numberOfCores];
    printf("Recieved alarm signal\n");

    int cpu;
    for (cpu = 0; cpu < numberOfCores; cpu++) {
        kill(child_pid[cpu], SIGKILL);
    }

    for (cpu=0;cpu <numberOfCores;cpu++){
        waitpid(-1, &status[numberOfCores],0);
    }
    for (cpu=0;cpu < numberOfCores;cpu++){
        printf("pid = %i  %ith child killed with signal ",child_pid[cpu],cpu);

        printf("%i %s\n", WTERMSIG(status[cpu]), strsignal(WTERMSIG(status[cpu])));
    }
    exit(0);

Upvotes: 0

Views: 1551

Answers (1)

user3088814
user3088814

Reputation: 31

I figured out what my problem was.

     for (cpu=0;cpu <numberOfCores;cpu++){
    waitpid(-1, &status[numberOfCores],0);

Should be. 

     for (cpu=0;cpu <numberOfCores;cpu++){
    waitpid(-1, &status[cpu],0);

Got it working correctly know. Thanks for helping me think.

Upvotes: 1

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