1   
    2   pid_t pid;
    3   
    4   void sigint_handler(int sig)
    5   {
    6     printf("pid %d got SIGINT, terminating\n", getpid());
    7     exit(0);
    8   }
    9   
   10   
   11   int main()
   12   {
   13   
   14     Signal(SIGINT, sigint_handler);
   15     if ( (pid = fork()) == 0 ) {
   16       setpgid(0,0);
   17       printf("child pid = %d, gid = %d\n", getpid(), getpgrp());
   18       pause();
   19     }
   20     printf("parent pid = %d, gid = %d\n", getpid(), getpgrp());
   21     pause();
   22   
   23     return 0;
   24   }