test_clone.c revision 84a66d0c8d79857586bad4e3d3010ee44f8f6971 
1/* Check that clone() is implemented and properly works
2 */
3#define __GNU_SOURCE 1
4#include <stdio.h>
5#include <errno.h>
6#include <sched.h>
7#include <unistd.h>
8#include <signal.h>
9#include <stdlib.h>
10#include <sys/ptrace.h>
11#include <sys/wait.h>
12#include <stdarg.h>
13#include <string.h>
14
15static int
16clone_child (void *arg)
17{
18 errno = 0;
19 ptrace (PTRACE_TRACEME, 0, 0, 0);
20 if (errno != 0)
21   perror ("ptrace");
22 if (kill (getpid (), SIGSTOP) < 0)
23   perror ("kill");
24 return 0;
25}
26
27#define PAGE_SIZE 4096
28#define STACK_SIZE (4 * PAGE_SIZE)
29
30char clone_stack[STACK_SIZE] __attribute__ ((aligned (PAGE_SIZE)));
31
32int
33main ()
34{
35 int pid,child;
36 int status;
37
38 pid = clone (clone_child, clone_stack + 3 * PAGE_SIZE,
39              CLONE_VM | SIGCHLD, NULL);
40 if (pid < 0)
41   {
42     perror ("clone");
43     exit (1);
44   }
45 printf ("child pid %d\n", pid);
46
47 //sleep(20);
48 child = waitpid (pid, &status, 0);
49 printf("waitpid returned %d\n", child);
50 if (child < 0) {
51   perror ("waitpid");
52   return 1;
53 }
54 printf ("child %d, status 0x%x\n", child, status);
55 return 0;
56}
57