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
logit_(const char * const str)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
main(int ac,char ** av)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