lab/lab5/zombie.c

   1 #include <stdlib.h>
   2 #include <stdio.h>
   3 #include <unistd.h>
   4
   5 #include <signal.h>
   6 #include <sys/wait.h>
   7
   8 pid_t children[5];
   9
  10 void announce_death() {
  11
  12     printf("i'm pid #%lu and i died.\n", (long) getpid());
  13 }
  14
  15 int main(int argc, char *argv[]) {
  16
  17     pid_t our_pid;
  18     our_pid = getpid();
  19
  20     for(int i = 0; i < 5; i++) {
  21         if((children[i] = fork()) == 0)
  22             goto child;
  23         else
  24             sleep(1);
  25     }
  26
  27     for(int i = 0; i < 5; i++) {
  28
  29         kill(children[i], SIGTERM);
  30         wait(0);
  31     }
  32
  33     return 0;
  34
  35     child:
  36         printf("i'm pid #%lu!\n", (long)getpid());
  37         atexit(announce_death);
  38         exit(0);
  39 }