1 /* Test of posix_spawn() function with 'chdir' action.
2 Copyright (C) 2008-2021 Free Software Foundation, Inc.
3
4 This program is free software: you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 3 of the License, or
7 (at your option) any later version.
8
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
13
14 You should have received a copy of the GNU General Public License
15 along with this program. If not, see <https://www.gnu.org/licenses/>. */
16
17 /* Written by Bruno Haible <bruno@clisp.org>, 2018. */
18
19 #include <config.h>
20
21 #include <spawn.h>
22
23 #include <errno.h>
24 #include <fcntl.h>
25 #include <signal.h>
26 #include <stdbool.h>
27 #include <stdio.h>
28 #include <stdlib.h>
29 #include <string.h>
30 #include <unistd.h>
31 #include <sys/types.h>
32 #include <sys/wait.h>
33
34 #include "findprog.h"
35
36 static int
37 fd_safer (int fd)
38 {
39 if (0 <= fd && fd <= 2)
40 {
41 int f = fd_safer (dup (fd));
42 int e = errno;
43 close (fd);
44 errno = e;
45 fd = f;
46 }
47
48 return fd;
49 }
50
51 static void
52 test (const char *pwd_prog)
53 {
54 char *argv[2] = { (char *) "pwd", NULL };
55 int ifd[2];
56 sigset_t blocked_signals;
57 sigset_t fatal_signal_set;
58 posix_spawn_file_actions_t actions;
59 bool actions_allocated;
60 posix_spawnattr_t attrs;
61 bool attrs_allocated;
62 int err;
63 pid_t child;
64 int fd;
65 FILE *fp;
66 char line[80];
67 int line_len;
68 int status;
69 int exitstatus;
70
71 if (pipe (ifd) < 0 || (ifd[0] = fd_safer (ifd[0])) < 0)
72 {
73 perror ("cannot create pipe");
74 exit (1);
75 }
76 sigprocmask (SIG_SETMASK, NULL, &blocked_signals);
77 sigemptyset (&fatal_signal_set);
78 sigaddset (&fatal_signal_set, SIGINT);
79 sigaddset (&fatal_signal_set, SIGTERM);
80 #ifdef SIGHUP
81 sigaddset (&fatal_signal_set, SIGHUP);
82 #endif
83 #ifdef SIGPIPE
84 sigaddset (&fatal_signal_set, SIGPIPE);
85 #endif
86 sigprocmask (SIG_BLOCK, &fatal_signal_set, NULL);
87 actions_allocated = false;
88 attrs_allocated = false;
89 if ((err = posix_spawn_file_actions_init (&actions)) != 0
90 || (actions_allocated = true,
91 (err = posix_spawn_file_actions_adddup2 (&actions, ifd[1], STDOUT_FILENO)) != 0
92 || (err = posix_spawn_file_actions_addclose (&actions, ifd[1])) != 0
93 || (err = posix_spawn_file_actions_addclose (&actions, ifd[0])) != 0
94 || (err = posix_spawn_file_actions_addopen (&actions, STDIN_FILENO, "/dev/null", O_RDONLY, 0)) != 0
95 || (err = posix_spawn_file_actions_addchdir (&actions, "/")) != 0
96 || (err = posix_spawnattr_init (&attrs)) != 0
97 || (attrs_allocated = true,
98 #if defined _WIN32 && !defined __CYGWIN__
99 0
100 #else
101 (err = posix_spawnattr_setsigmask (&attrs, &blocked_signals)) != 0
102 || (err = posix_spawnattr_setflags (&attrs, POSIX_SPAWN_SETSIGMASK)) != 0
103 #endif
104 )
105 || (err = posix_spawnp (&child, pwd_prog, &actions, &attrs, argv, environ)) != 0))
106 {
107 if (actions_allocated)
108 posix_spawn_file_actions_destroy (&actions);
109 if (attrs_allocated)
110 posix_spawnattr_destroy (&attrs);
111 sigprocmask (SIG_UNBLOCK, &fatal_signal_set, NULL);
112 errno = err;
113 perror ("subprocess failed");
114 exit (1);
115 }
116 posix_spawn_file_actions_destroy (&actions);
117 posix_spawnattr_destroy (&attrs);
118 sigprocmask (SIG_UNBLOCK, &fatal_signal_set, NULL);
119 close (ifd[1]);
120 fd = ifd[0];
121 fp = fdopen (fd, "rb");
122 if (fp == NULL)
123 {
124 fprintf (stderr, "fdopen() failed\n");
125 exit (1);
126 }
127 line_len = fread (line, 1, 80, fp);
128 if (line_len < 2)
129 {
130 fprintf (stderr, "could not read expected output\n");
131 exit (1);
132 }
133 if (!(line_len == 2 && memcmp (line, "/\n", 2) == 0))
134 #if defined _WIN32 && !defined __CYGWIN__
135 /* If the pwd program is Cygwin's pwd, its output in the root directory is
136 "/cygdrive/N", where N is a lowercase letter. */
137 if (!(line_len > 11
138 && memcmp (line, "/cygdrive/", 10) == 0
139 && line[10] >= 'a' && line[10] <= 'z'
140 && ((line_len == 12 && line[11] == '\n')
141 || (line_len == 13 && line[11] == '\r' && line[12] == '\n'))))
142 #endif
143 {
144 fprintf (stderr, "read output is not the expected output\n");
145 exit (1);
146 }
147 fclose (fp);
148 status = 0;
149 while (waitpid (child, &status, 0) != child)
150 ;
151 if (!WIFEXITED (status))
152 {
153 fprintf (stderr, "subprocess terminated with unexpected wait status %d\n", status);
154 exit (1);
155 }
156 exitstatus = WEXITSTATUS (status);
157 if (exitstatus != 0)
158 {
159 fprintf (stderr, "subprocess terminated with unexpected exit status %d\n", exitstatus);
160 exit (1);
161 }
162 }
163
164 int
165 main ()
166 {
167 test ("pwd");
168
169 /* Verify that if a program is given as a relative file name with at least one
170 slash, it is interpreted w.r.t. the current directory after chdir has been
171 executed. */
172 {
173 const char *abs_pwd_prog = find_in_path ("pwd");
174
175 if (abs_pwd_prog != NULL
176 && abs_pwd_prog[0] == '/'
177 && abs_pwd_prog[1] != '0' && abs_pwd_prog[1] != '/')
178 test (&abs_pwd_prog[1]);
179 }
180
181 return 0;
182 }