#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/wait.h>

int main(int argc, char **argv) {
  printf("[parent] about to fork..\n");

  pid_t cpid = fork();
  if (cpid == 0) {
    // child
    // (parent pid available via getppid())
    printf("[child] I'm alive!\n");
    printf("[child] Sleeping 8 seconds...\n");
    sleep(8);
    printf("[child] exiting...becoming a zombie.\n");
    return 10;
  } else if (cpid < 0) {
    // parent -- fork failed
    perror("[parent] fork failed");
    return EXIT_FAILURE;
  }

  // parent -- fork succeeded
  printf("[parent] My child lives!\n");
  // sleep so child becomes a zombie
  sleep(10);

  printf("[parent] Waiting for my child to die...\n");
  int stat_loc;
  waitpid(cpid, &stat_loc, 0);
  printf("[parent] My child has died.\n");
  printf("[parent] Status code from child is %d\n", WEXITSTATUS(stat_loc));
  
  return EXIT_SUCCESS;
}