test/unistd/clone.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * clone test for uClibc
   4  * Copyright (C) 2000-2006 by Erik Andersen <andersen@uclibc.org>
   5  *
   6  * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
   7  */
   8
   9 #include <stdio.h>
  10 #include <stdlib.h>
  11 #include <unistd.h>
  12 #include <signal.h>
  13 #include <sched.h>
  14 #include <sys/wait.h>
  15 #include "clone_cruft.h"
  16
  17 #define GOT1     (1 << 1)
  18 #define GOT2     (1 << 2)
  19 #define GOT3     (1 << 3)
  20 #define ALLGOT   (GOT1|GOT2|GOT3)
  21
  22 static void child_handler(int sig)
  23 {
  24         printf("I got a SIGCHLD\n");
  25 }
  26
  27 static int clone_main(void *arg)
  28 {
  29         unsigned long input = (unsigned long)arg;
  30         int secs = (input / 10) * 4;
  31         printf("Clone got %lu, sleeping for %i secs\n", input, secs);
  32         sleep(secs);
  33         return input + 20;
  34 }
  35
  36 int main(void)
  37 {
  38         int clone1, clone2, clone3;
  39         char clone1_stack[8192], clone2_stack[8192], clone3_stack[8192];
  40         int status, nostatus, result, wpid;
  41
  42         signal(SIGCHLD, child_handler);
  43
  44         if ((clone1 = do_clone(clone_main, clone1_stack, 0, (void*)11)) == -1) {
  45                 perror("Clone 1 failed");
  46                 exit(-1);
  47         }
  48         if ((clone2 = do_clone(clone_main, clone2_stack, 0, (void*)22)) == -1) {
  49                 perror("Clone 2 failed");
  50                 exit(-2);
  51         }
  52         if ((clone3 = do_clone(clone_main, clone3_stack, 0, (void*)33)) == -1) {
  53                 perror("Clone 3 failed");
  54                 exit(-3);
  55         }
  56
  57         sleep(1);
  58         printf("Parent: waiting for the clones to die.\n");
  59         nostatus = status = 0;
  60         while (1) {
  61                 if ((wpid = waitpid(clone1, &result, WNOHANG|__WCLONE)) == -1)
  62                         nostatus |= GOT1;
  63                 if (wpid == clone1) {
  64                         status |= GOT1;
  65                         printf("Clone1 gave back %i\n", WEXITSTATUS(result));
  66                 }
  67
  68                 if ((wpid = waitpid(clone2, &result, WNOHANG|__WCLONE)) == -1)
  69                         nostatus |= GOT2;
  70                 if (wpid == clone2) {
  71                         status |= GOT2;
  72                         printf("Clone2 gave back %i\n", WEXITSTATUS(result));
  73                 }
  74
  75                 if ((wpid = waitpid(clone3, &result, WNOHANG|__WCLONE)) == -1)
  76                         nostatus |= GOT3;
  77                 if (wpid == clone3) {
  78                         status |= GOT3;
  79                         printf("Clone3 gave back %i\n", WEXITSTATUS(result));
  80                 }
  81
  82                 if (status == ALLGOT || nostatus == ALLGOT)
  83                         break;
  84         }
  85
  86         if (status == ALLGOT) {
  87                 printf("Clones exited.\nGoodbye.\n");
  88                 return EXIT_SUCCESS;
  89         } else {
  90                 perror("Waiting for clones failed");
  91                 return EXIT_FAILURE;
  92         }
  93 }
  94
  95 /*
  96 Local Variables:
  97 c-file-style: "linux"
  98 c-basic-offset: 4
  99 tab-width: 4
 100 End:
 101 */