test_clone.c revision 133a37ede3e955093c6004d94496e2cdc2cc1264 
1/*
2 * Copyright (C) 2010 The Android Open Source Project
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *  * Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 *  * Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in
12 *    the documentation and/or other materials provided with the
13 *    distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28/* Check that clone() is implemented and properly works
29 */
30#define _GNU_SOURCE 1
31#include <stdio.h>
32#include <errno.h>
33#include <sched.h>
34#include <unistd.h>
35#include <signal.h>
36#include <stdlib.h>
37#include <sys/ptrace.h>
38#include <sys/wait.h>
39#include <stdarg.h>
40#include <string.h>
41
42static int
43clone_child (void *arg)
44{
45 errno = 0;
46 ptrace (PTRACE_TRACEME, 0, 0, 0);
47 if (errno != 0)
48   perror ("ptrace");
49 if (kill (getpid (), SIGSTOP) < 0)
50   perror ("kill");
51 return 0;
52}
53
54#define PAGE_SIZE 4096
55#define STACK_SIZE (4 * PAGE_SIZE)
56
57char clone_stack[STACK_SIZE] __attribute__ ((aligned (PAGE_SIZE)));
58
59int
60main ()
61{
62 int pid,child;
63 int status;
64
65 pid = clone (clone_child, clone_stack + 3 * PAGE_SIZE,
66              CLONE_VM | SIGCHLD, NULL);
67 if (pid < 0)
68   {
69     perror ("clone");
70     exit (1);
71   }
72 printf ("child pid %d\n", pid);
73
74 //sleep(20);
75 child = waitpid (pid, &status, 0);
76 printf("waitpid returned %d\n", child);
77 if (child < 0) {
78   perror ("waitpid");
79   return 1;
80 }
81 printf ("child %d, status 0x%x\n", child, status);
82 return 0;
83}
84