1 /* 2 * Check handling of CLONE_PARENT'ed processes. 3 * 4 * Copyright (c) 2017 The strace developers. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. The name of the author may not be used to endorse or promote products 16 * derived from this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 */ 29 30 #include "tests.h" 31 32 #include <errno.h> 33 #include <sched.h> 34 #include <signal.h> 35 #include <stdio.h> 36 #include <stdlib.h> 37 #include <sys/wait.h> 38 #include <unistd.h> 39 40 static int 41 child(void *const arg) 42 { 43 return 42; 44 } 45 46 #define child_stack_size (get_page_size() / 2) 47 48 #ifdef IA64 49 extern int __clone2(int (*)(void *), void *, size_t, int, void *, ...); 50 # define clone(fn, child_stack, flags, arg) \ 51 __clone2(fn, child_stack, child_stack_size, flags, arg) 52 #endif 53 54 int 55 main(void) 56 { 57 const pid_t pid = clone(child, tail_alloc(child_stack_size), 58 CLONE_PARENT | SIGCHLD, 0); 59 if (pid < 0) 60 perror_msg_and_fail("clone"); 61 62 int status; 63 if (wait(&status) >= 0) 64 error_msg_and_fail("unexpected return code from wait"); 65 66 while (!kill(pid, 0)) 67 ; 68 if (errno != ESRCH) 69 perror_msg_and_fail("kill"); 70 71 FILE *const fp = fdopen(3, "a"); 72 if (!fp) 73 perror_msg_and_fail("fdopen"); 74 if (fprintf(fp, "%s: Exit of unknown pid %d ignored\n", 75 getenv("STRACE_EXE") ?: "strace", pid) < 0) 76 perror_msg_and_fail("fprintf"); 77 78 puts("+++ exited with 0 +++"); 79 return 0; 80 } 81
