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e83be730 | 1 | /* Check posix_spawn add file actions. |
04277e02 | 2 | Copyright (C) 2016-2019 Free Software Foundation, Inc. |
e83be730 AZ |
3 | This file is part of the GNU C Library. |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Lesser General Public | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
16 | License along with the GNU C Library; if not, see | |
17 | <http://www.gnu.org/licenses/>. */ | |
18 | ||
19 | #include <stdio.h> | |
20 | #include <spawn.h> | |
21 | #include <error.h> | |
22 | #include <errno.h> | |
23 | #include <stdlib.h> | |
24 | #include <string.h> | |
25 | #include <unistd.h> | |
26 | #include <sys/wait.h> | |
27 | #include <sys/resource.h> | |
1a920d9c AZ |
28 | #include <fcntl.h> |
29 | #include <paths.h> | |
e83be730 | 30 | |
1a920d9c AZ |
31 | #include <support/check.h> |
32 | #include <support/temp_file.h> | |
e83be730 AZ |
33 | |
34 | static int | |
35 | do_test (void) | |
36 | { | |
37 | /* The test checks if posix_spawn open file action close the file descriptor | |
38 | before opening a new one in case the input file descriptor is already | |
39 | opened. It does by exhausting all file descriptors on the process before | |
40 | issue posix_spawn. It then issues a posix_spawn for '/bin/sh echo $$' | |
41 | and add two rules: | |
42 | ||
43 | 1. Redirect stdout to a temporary filepath | |
44 | 2. Redirect stderr to stdout | |
45 | ||
46 | If the implementation does not close the file 1. will fail with | |
47 | EMFILE. */ | |
48 | ||
49 | struct rlimit rl; | |
50 | int max_fd = 24; | |
1a920d9c | 51 | int ret; |
e83be730 AZ |
52 | |
53 | /* Set maximum number of file descriptor to a low value to avoid open | |
54 | too many files in environments where RLIMIT_NOFILE is large and to | |
55 | limit the array size to track the opened file descriptors. */ | |
56 | ||
57 | if (getrlimit (RLIMIT_NOFILE, &rl) == -1) | |
1a920d9c | 58 | FAIL_EXIT1 ("getrlimit (RLIMIT_NOFILE): %m"); |
e83be730 AZ |
59 | |
60 | max_fd = (rl.rlim_cur < max_fd ? rl.rlim_cur : max_fd); | |
61 | rl.rlim_cur = max_fd; | |
62 | ||
63 | if (setrlimit (RLIMIT_NOFILE, &rl) == 1) | |
1a920d9c | 64 | FAIL_EXIT1 ("setrlimit (RLIMIT_NOFILE): %m"); |
e83be730 AZ |
65 | |
66 | /* Exhauste the file descriptor limit with temporary files. */ | |
67 | int files[max_fd]; | |
68 | int nfiles = 0; | |
69 | for (;;) | |
70 | { | |
71 | int fd = create_temp_file ("tst-spawn3.", NULL); | |
72 | if (fd == -1) | |
73 | { | |
74 | if (errno != EMFILE) | |
1a920d9c | 75 | FAIL_EXIT1 ("create_temp_file: %m"); |
e83be730 AZ |
76 | break; |
77 | } | |
78 | files[nfiles++] = fd; | |
79 | } | |
80 | ||
81 | posix_spawn_file_actions_t a; | |
82 | if (posix_spawn_file_actions_init (&a) != 0) | |
1a920d9c | 83 | FAIL_EXIT1 ("posix_spawn_file_actions_init"); |
e83be730 | 84 | |
27f10a09 JM |
85 | /* Executes a /bin/sh echo $$ 2>&1 > ${objpfx}tst-spawn3.pid . */ |
86 | const char pidfile[] = OBJPFX "tst-spawn3.pid"; | |
34a5a146 JM |
87 | if (posix_spawn_file_actions_addopen (&a, STDOUT_FILENO, pidfile, O_WRONLY |
88 | | O_CREAT | O_TRUNC, 0644) != 0) | |
1a920d9c | 89 | FAIL_EXIT1 ("posix_spawn_file_actions_addopen"); |
e83be730 AZ |
90 | |
91 | if (posix_spawn_file_actions_adddup2 (&a, STDOUT_FILENO, STDERR_FILENO) != 0) | |
1a920d9c | 92 | FAIL_EXIT1 ("posix_spawn_file_actions_adddup2"); |
e83be730 AZ |
93 | |
94 | /* Since execve (called by posix_spawn) might require to open files to | |
95 | actually execute the shell script, setup to close the temporary file | |
96 | descriptors. */ | |
97 | for (int i=0; i<nfiles; i++) | |
98 | { | |
99 | if (posix_spawn_file_actions_addclose (&a, files[i])) | |
1a920d9c | 100 | FAIL_EXIT1 ("posix_spawn_file_actions_addclose"); |
e83be730 AZ |
101 | } |
102 | ||
103 | char *spawn_argv[] = { (char *) _PATH_BSHELL, (char *) "-c", | |
104 | (char *) "echo $$", NULL }; | |
105 | pid_t pid; | |
1a920d9c AZ |
106 | if ((ret = posix_spawn (&pid, _PATH_BSHELL, &a, NULL, spawn_argv, NULL)) |
107 | != 0) | |
e83be730 | 108 | { |
1a920d9c AZ |
109 | errno = ret; |
110 | FAIL_EXIT1 ("posix_spawn: %m"); | |
e83be730 AZ |
111 | } |
112 | ||
113 | int status; | |
114 | int err = waitpid (pid, &status, 0); | |
115 | if (err != pid) | |
1a920d9c | 116 | FAIL_EXIT1 ("waitpid: %m"); |
e83be730 AZ |
117 | |
118 | /* Close the temporary files descriptor so it can check posix_spawn | |
119 | output. */ | |
120 | for (int i=0; i<nfiles; i++) | |
121 | { | |
122 | if (close (files[i])) | |
1a920d9c | 123 | FAIL_EXIT1 ("close: %m"); |
e83be730 AZ |
124 | } |
125 | ||
126 | int pidfd = open (pidfile, O_RDONLY); | |
127 | if (pidfd == -1) | |
1a920d9c | 128 | FAIL_EXIT1 ("open: %m"); |
e83be730 AZ |
129 | |
130 | char buf[64]; | |
131 | ssize_t n; | |
132 | if ((n = read (pidfd, buf, sizeof (buf))) < 0) | |
1a920d9c | 133 | FAIL_EXIT1 ("read: %m"); |
e83be730 AZ |
134 | |
135 | unlink (pidfile); | |
136 | ||
137 | /* We only expect to read the PID. */ | |
138 | char *endp; | |
139 | long int rpid = strtol (buf, &endp, 10); | |
140 | if (*endp != '\n') | |
1a920d9c | 141 | FAIL_EXIT1 ("*endp != \'n\'"); |
e83be730 | 142 | if (endp == buf) |
1a920d9c | 143 | FAIL_EXIT1 ("read empty line"); |
e83be730 AZ |
144 | |
145 | if (rpid != pid) | |
1a920d9c | 146 | FAIL_EXIT1 ("found \"%s\", expected pid %ld\n", buf, (long int) pid); |
e83be730 AZ |
147 | |
148 | return 0; | |
149 | } | |
1a920d9c AZ |
150 | |
151 | #include <support/test-driver.c> |