如何杀死多个子进程

Question

In C program simulating reader-writer problem, I have created multiple child processes using fork() and each child process called execlp() and runs another program (reader or writer) in an xterm window.

When I end the main() , those child running in xterm are still alive. How do i terminate them as well?

Code sample below-

main() {
    while(1) {
    scanf(choice);
    switch(choice) {
        case 1: 
            reader()
            break;
        case 2: 
            writer();
            break;
        default:
            kill(getpgid(getpid()), SIGTERM); // killing the group id
            return 0;
        }
    }

reader() {
    /*
    some semaphore manipulation
    */
    execlp("xterm", "xterm", "-e", "./read", NULL);
    /*
    some semaphore manipulation
    */
    return 0;
    }

writer() {
    /*
    some semaphore manipulation
    */
    execlp("xterm", "xterm", "-e", "./write", NULL);
    /*
    some semaphore manipulation
    */
    return 0;
    }

Answer 1

The Group id of the parent and the child should be the same after forking so sending kill(pid,SIGTERM); should take care of them ( where pid is the group Id )

as pointed ouf by caf in a comment bellow , kill(0, SIGTERM) will send the signal to the current process's process group