1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
|
/* Test of posix_spawn() function with 'chdir' action.
Copyright (C) 2008-2023 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
/* Written by Bruno Haible <bruno@clisp.org>, 2018. */
#include <config.h>
#include <spawn.h>
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/wait.h>
#include "findprog.h"
static int
fd_safer (int fd)
{
if (0 <= fd && fd <= 2)
{
int f = fd_safer (dup (fd));
int e = errno;
close (fd);
errno = e;
fd = f;
}
return fd;
}
static void
test (const char *pwd_prog)
{
char *argv[2] = { (char *) "pwd", NULL };
int ifd[2];
sigset_t blocked_signals;
sigset_t fatal_signal_set;
posix_spawn_file_actions_t actions;
bool actions_allocated;
posix_spawnattr_t attrs;
bool attrs_allocated;
int err;
pid_t child;
int fd;
FILE *fp;
char line[80];
int line_len;
int status;
int exitstatus;
if (pipe (ifd) < 0 || (ifd[0] = fd_safer (ifd[0])) < 0)
{
perror ("cannot create pipe");
exit (1);
}
sigprocmask (SIG_SETMASK, NULL, &blocked_signals);
sigemptyset (&fatal_signal_set);
sigaddset (&fatal_signal_set, SIGINT);
sigaddset (&fatal_signal_set, SIGTERM);
#ifdef SIGHUP
sigaddset (&fatal_signal_set, SIGHUP);
#endif
#ifdef SIGPIPE
sigaddset (&fatal_signal_set, SIGPIPE);
#endif
sigprocmask (SIG_BLOCK, &fatal_signal_set, NULL);
actions_allocated = false;
attrs_allocated = false;
if ((err = posix_spawn_file_actions_init (&actions)) != 0
|| (actions_allocated = true,
(err = posix_spawn_file_actions_adddup2 (&actions, ifd[1], STDOUT_FILENO)) != 0
|| (err = posix_spawn_file_actions_addclose (&actions, ifd[1])) != 0
|| (err = posix_spawn_file_actions_addclose (&actions, ifd[0])) != 0
|| (err = posix_spawn_file_actions_addopen (&actions, STDIN_FILENO, "/dev/null", O_RDONLY, 0)) != 0
|| (err = posix_spawn_file_actions_addchdir (&actions, "/")) != 0
|| (err = posix_spawnattr_init (&attrs)) != 0
|| (attrs_allocated = true,
#if defined _WIN32 && !defined __CYGWIN__
0
#else
(err = posix_spawnattr_setsigmask (&attrs, &blocked_signals)) != 0
|| (err = posix_spawnattr_setflags (&attrs, POSIX_SPAWN_SETSIGMASK)) != 0
#endif
)
|| (err = posix_spawnp (&child, pwd_prog, &actions, &attrs, argv, environ)) != 0))
{
if (actions_allocated)
posix_spawn_file_actions_destroy (&actions);
if (attrs_allocated)
posix_spawnattr_destroy (&attrs);
sigprocmask (SIG_UNBLOCK, &fatal_signal_set, NULL);
errno = err;
perror ("subprocess failed");
exit (1);
}
posix_spawn_file_actions_destroy (&actions);
posix_spawnattr_destroy (&attrs);
sigprocmask (SIG_UNBLOCK, &fatal_signal_set, NULL);
close (ifd[1]);
fd = ifd[0];
fp = fdopen (fd, "rb");
if (fp == NULL)
{
fprintf (stderr, "fdopen() failed\n");
exit (1);
}
line_len = fread (line, 1, 80, fp);
if (line_len < 2)
{
fprintf (stderr, "could not read expected output\n");
exit (1);
}
if (!(line_len == 2 && memcmp (line, "/\n", 2) == 0))
#if defined _WIN32 && !defined __CYGWIN__
/* If the pwd program is Cygwin's pwd, its output in the root directory is
"/cygdrive/N", where N is a lowercase letter. */
if (!(line_len > 11
&& memcmp (line, "/cygdrive/", 10) == 0
&& line[10] >= 'a' && line[10] <= 'z'
&& ((line_len == 12 && line[11] == '\n')
|| (line_len == 13 && line[11] == '\r' && line[12] == '\n'))))
#endif
{
fprintf (stderr, "read output is not the expected output\n");
exit (1);
}
fclose (fp);
status = 0;
while (waitpid (child, &status, 0) != child)
;
if (!WIFEXITED (status))
{
fprintf (stderr, "subprocess terminated with unexpected wait status %d\n", status);
exit (1);
}
exitstatus = WEXITSTATUS (status);
if (exitstatus != 0)
{
fprintf (stderr, "subprocess terminated with unexpected exit status %d\n", exitstatus);
exit (1);
}
}
int
main ()
{
test ("pwd");
/* Verify that if a program is given as a relative file name with at least one
slash, it is interpreted w.r.t. the current directory after chdir has been
executed. */
{
const char *abs_pwd_prog = find_in_path ("pwd");
if (abs_pwd_prog != NULL
&& abs_pwd_prog[0] == '/'
&& abs_pwd_prog[1] != '0' && abs_pwd_prog[1] != '/')
test (&abs_pwd_prog[1]);
}
return 0;
}
|
