openat: don’t close (-1)
[gnulib.git] / tests / test-fdopendir.c
blob3430d03bad3408930638b3b6df15c7ab44bc79ee
1 /* Test opening a directory stream from a file descriptor.
2 Copyright (C) 2009-2024 Free Software Foundation, Inc.
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.
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.
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/>. */
17 /* Written by Eric Blake <ebb9@byu.net>, 2009. */
19 #include <config.h>
21 #include <dirent.h>
23 #include "signature.h"
24 SIGNATURE_CHECK (fdopendir, DIR *, (int));
26 #include <errno.h>
27 #include <fcntl.h>
28 #include <unistd.h>
30 #include "macros.h"
32 int
33 main ()
35 DIR *d;
36 int fd;
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);
47 /* A bad fd cannot be turned into a stream. */
49 errno = 0;
50 ASSERT (fdopendir (-1) == NULL);
51 ASSERT (errno == EBADF);
54 close (99);
55 errno = 0;
56 ASSERT (fdopendir (99) == NULL);
57 ASSERT (errno == EBADF);
59 #ifdef AT_FDCWD
61 errno = 0;
62 ASSERT (fdopendir (AT_FDCWD) == NULL);
63 ASSERT (errno == EBADF);
65 #endif
67 /* This should work. */
68 fd = open (".", O_RDONLY);
69 ASSERT (0 <= fd);
70 d = fdopendir (fd);
71 ASSERT (d);
72 /* fdopendir should not close fd. */
73 ASSERT (dup2 (fd, fd) == fd);
75 /* Don't test dirfd here. dirfd (d) must return fd on current POSIX
76 platforms, but on pre-2008 platforms or on non-POSIX platforms
77 dirfd (fd) might return some other descriptor, or -1, and gnulib
78 does not work around this porting problem. */
80 ASSERT (closedir (d) == 0);
81 /* Now we can guarantee that fd must be closed. */
82 errno = 0;
83 ASSERT (dup2 (fd, fd) == -1);
84 ASSERT (errno == EBADF);
86 return test_exit_status;