2 * Copyright (c) 2015-2016 Dmitry V. Levin <ldv@altlinux.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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.
37 logit_(const char *const str)
42 #define prefix "vfork-f."
43 #define logit(arg) logit_(prefix arg)
45 int main(int ac, char **av)
50 if (read(0, &ac, sizeof(int)))
57 int child_wait_fds[2];
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");
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");
72 char *const args[] = { av[0], (char *) "", NULL };
76 perror_msg_and_fail("vfork");
79 if (logit("child") || execve(args[0], args, args + 1))
84 close(parent_wait_fds[1]);
86 if (read(parent_wait_fds[0], &parent_wait_fds[1], sizeof(int)))
87 perror_msg_and_fail("read");
89 close(child_wait_fds[1]);
92 assert(wait(&status) == pid);
95 pid_t ppid = getpid();
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",