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 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 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
