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 15 static int 16 clone_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 30 char clone_stack[STACK_SIZE] __attribute__ ((aligned (PAGE_SIZE))); 31 32 int 33 main () 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
