1 /* 2 * Copyright (c) 2015-2016 Dmitry V. Levin <ldv@altlinux.org> 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 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. The name of the author may not be used to endorse or promote products 14 * derived from this software without specific prior written permission. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 #include "tests.h" 29 #include <assert.h> 30 #include <fcntl.h> 31 #include <stdio.h> 32 #include <string.h> 33 #include <unistd.h> 34 #include <sys/wait.h> 35 36 static inline int 37 logit_(const char *const str) 38 { 39 return !chdir(str); 40 } 41 42 #define prefix "vfork-f." 43 #define logit(arg) logit_(prefix arg) 44 45 int main(int ac, char **av) 46 { 47 if (ac < 1) 48 return 1; 49 if (ac > 1) { 50 if (read(0, &ac, sizeof(int))) 51 return 2; 52 return logit("exec"); 53 } 54 55 logit("start"); 56 57 int child_wait_fds[2]; 58 (void) close(0); 59 if (pipe(child_wait_fds)) 60 perror_msg_and_fail("pipe"); 61 if (fcntl(child_wait_fds[1], F_SETFD, FD_CLOEXEC)) 62 perror_msg_and_fail("fcntl"); 63 64 int parent_wait_fds[2]; 65 if (pipe(parent_wait_fds)) 66 perror_msg_and_fail("pipe"); 67 if (fcntl(parent_wait_fds[0], F_SETFD, FD_CLOEXEC)) 68 perror_msg_and_fail("fcntl"); 69 if (fcntl(parent_wait_fds[1], F_SETFD, FD_CLOEXEC)) 70 perror_msg_and_fail("fcntl"); 71 72 char *const args[] = { av[0], (char *) "", NULL }; 73 pid_t pid = vfork(); 74 75 if (pid < 0) 76 perror_msg_and_fail("vfork"); 77 78 if (!pid) { 79 if (logit("child") || execve(args[0], args, args + 1)) 80 _exit(2); 81 } 82 83 close(0); 84 close(parent_wait_fds[1]); 85 86 if (read(parent_wait_fds[0], &parent_wait_fds[1], sizeof(int))) 87 perror_msg_and_fail("read"); 88 logit("parent"); 89 close(child_wait_fds[1]); 90 91 int status; 92 assert(wait(&status) == pid); 93 assert(status == 0); 94 95 pid_t ppid = getpid(); 96 logit("finish"); 97 98 printf("%-5d chdir(\"%sstart\") = -1 ENOENT (%m)\n" 99 "%-5d chdir(\"%schild\") = -1 ENOENT (%m)\n" 100 "%-5d chdir(\"%sparent\") = -1 ENOENT (%m)\n" 101 "%-5d chdir(\"%sexec\") = -1 ENOENT (%m)\n" 102 "%-5d chdir(\"%sfinish\") = -1 ENOENT (%m)\n", 103 ppid, prefix, 104 pid, prefix, 105 ppid, prefix, 106 pid, prefix, 107 ppid, prefix); 108 return 0; 109 } 110