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
42 static int
clone_child(void * arg)43 clone_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
57 char clone_stack[STACK_SIZE] __attribute__ ((aligned (PAGE_SIZE)));
58
59 int
main()60 main ()
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