1 /* Test opening a directory stream from a file descriptor.
2 Copyright (C) 2009-2021 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 Eric Blake <ebb9@byu.net>, 2009. */
18
19 #include <config.h>
20
21 #include <dirent.h>
22
23 #include "signature.h"
24 SIGNATURE_CHECK (fdopendir, DIR *, (int));
25
26 #include <errno.h>
27 #include <fcntl.h>
28 #include <unistd.h>
29
30 #include "macros.h"
31
32 int
main(_GL_UNUSED int argc,char * argv[])33 main (_GL_UNUSED int argc, char *argv[])
34 {
35 DIR *d;
36 int fd;
37
38 /* A non-directory cannot be turned into a directory stream. */
39 fd = open ("test-fdopendir.tmp", O_RDONLY | O_CREAT, 0600);
40 ASSERT (0 <= fd);
41 errno = 0;
42 ASSERT (fdopendir (fd) == NULL);
43 ASSERT (errno == ENOTDIR);
44 ASSERT (close (fd) == 0);
45 ASSERT (unlink ("test-fdopendir.tmp") == 0);
46
47 /* A bad fd cannot be turned into a stream. */
48 {
49 errno = 0;
50 ASSERT (fdopendir (-1) == NULL);
51 ASSERT (errno == EBADF);
52 }
53 {
54 close (99);
55 errno = 0;
56 ASSERT (fdopendir (99) == NULL);
57 ASSERT (errno == EBADF);
58 }
59
60 /* This should work. */
61 fd = open (".", O_RDONLY);
62 ASSERT (0 <= fd);
63 d = fdopendir (fd);
64 ASSERT (d);
65 /* fdopendir should not close fd. */
66 ASSERT (dup2 (fd, fd) == fd);
67
68 /* Don't test dirfd here. dirfd (d) must return fd on current POSIX
69 platforms, but on pre-2008 platforms or on non-POSIX platforms
70 dirfd (fd) might return some other descriptor, or -1, and gnulib
71 does not work around this porting problem. */
72
73 ASSERT (closedir (d) == 0);
74 /* Now we can guarantee that fd must be closed. */
75 errno = 0;
76 ASSERT (dup2 (fd, fd) == -1);
77 ASSERT (errno == EBADF);
78
79 return 0;
80 }
81