fork(2) download
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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. #include <signal.h>
  4. #include <errno.h>
  5. #include <assert.h>
  6.  
  7. #include <unistd.h>
  8. #include <sched.h>
  9.  
  10. pid_t parent_pid;
  11.  
  12. void sigquit_handler (int sig) {
  13.     assert(sig == SIGQUIT);
  14.     pid_t self = getpid();
  15.     if (parent_pid != self) _exit(0);
  16. }
  17.  
  18. int main ()
  19. {
  20.     int i;
  21.  
  22.     signal(SIGQUIT, sigquit_handler);
  23.     parent_pid = getpid();
  24.  
  25.     puts("launching children");
  26.     fflush(stdout);
  27.     for (i = 0; i < 5; ++i) {
  28.         pid_t p = fork();
  29.         switch (p) {
  30.         case 0:
  31.             printf("child running: %d\n", (int)getpid());
  32.             fflush(stdout);
  33.             sleep(100);
  34.             abort();
  35.         case -1:
  36.             perror("fork");
  37.             abort();
  38.         default:
  39.             break;
  40.         }
  41.     }
  42.  
  43.     puts("sleeping 1 second");
  44.     sleep(1);
  45.  
  46.     puts("killing children");
  47.     kill(-parent_pid, SIGQUIT);
  48.     for (i = 0; i < 5; ++i) {
  49.         int status;
  50.         for (;;) {
  51.             pid_t child = wait(&status);
  52.             if (child > 0 && WIFEXITED(status) && WEXITSTATUS(status) == 0) {
  53.                 printf("child %d succesully quit\n", (int)child);
  54.             } else if (child < 0 && errno == EINTR) {
  55.                 continue;
  56.             } else {
  57.                 perror("wait");
  58.                 abort();
  59.             }
  60.             break;
  61.         }
  62.     }
  63.  
  64.     puts("sleeping 5 seconds");
  65.     sleep(5);
  66.  
  67.     puts("done");
  68.     return 0;
  69. }
Success #stdin #stdout 0s 2292KB
comments (?)
stdin
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Standard input is empty
stdout
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launching children
child running: 31307
child running: 31308
child running: 31306
child running: 31305
child running: 31304
sleeping 1 second
killing children
child 31304 succesully quit
child 31305 succesully quit
child 31306 succesully quit
child 31307 succesully quit
child 31308 succesully quit
sleeping 5 seconds
done
https://ideone.com/4zs4u3
language:
C (gcc 8.3)
created:
10 years ago
visibility:
public

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