How to make a program to restart itself? (Linux process)

Question

I'm trying to get my program to restart itself, but nothing seems to work. I tried using fork(), but after killing the parent process the child gets killed too.

CODE

void sigup_handler(int signum) {
    int pid = fork();
    if (pid == 0) {
        execve("prog2", NULL); 
    }
    else
        kill(getpid(), SIGTERM);
}

int main() {
    puts("Program 2 started.");
    signal(SIGHUP, sigup_handler);
    sleep(50); 
    puts("Program 2 terminated.");
    return 0;
}

Answer 1

Why bother with the fork if you're just going to kill the parent? Just do the exec. The new instance of the program will still be the same process but will effectively be rebooted.