CODEWITHSUNDEEP
cprocesssignals
wthr
wthr

Reputation: 23

kill(pid,SIGTERM) terminates child process, although pid is of parent

I'm learning about process allocation.

Take this code block for example:

int main(){
    pid_t pid = fork();
    if(pid == 0){
        while(1)
            printf("Child ");
    } else {
        for(int i = 0; i<1000;i++)
            printf("Parent ");
        kill(pid,SIGTERM);
        printf("\n%d \n ", pid);
    }
}

pid = 0 is the child process, pid > 0 is the parent process. kill(pid,SIGTERM) is executed by the parent with it's own pid, yet it kills the child and not itself. Why?

Upvotes: 2

Views: 1332

Answers (1)

Daniel Walker
Daniel Walker

Reputation: 6782

As @Siguza mentioned in the comments, you should re-read the documentation of fork. fork returns a positive value of pid to the parent process. That value is the PID of the child process. Therefore, kill(pid, SIGTERM) sends the signal to the child and not the parent.

Upvotes: 2

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