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source: kBuild/vendor/grep/2.12/gnulib-tests/test-dirent-safer.c

Last change on this file was 2595, checked in by bird, 12 years ago

gnu grep version 2.12 (grep-2.12.tar.xz, md5sum=8d2f0346d08b13c18afb81f0e8aa1e2f)

  • Property svn:eol-style set to native
File size: 2.8 KB
Line 
1/* Test that directory streams leave standard fds alone.
2 Copyright (C) 2009-2012 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 <http://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 <errno.h>
24#include <fcntl.h>
25#include <stdio.h>
26#include <unistd.h>
27
28#include "unistd-safer.h"
29
30/* This test intentionally closes stderr. So, we arrange to have fd 10
31 (outside the range of interesting fd's during the test) set up to
32 duplicate the original stderr. */
33
34#define BACKUP_STDERR_FILENO 10
35#define ASSERT_STREAM myerr
36#include "macros.h"
37
38static FILE *myerr;
39
40int
41main (void)
42{
43 int i;
44 DIR *dp;
45 /* The dirent-safer module works without the use of fdopendir (which
46 would also pull in fchdir and openat); but if those modules were
47 also used, we ensure that they are safe. In particular, the
48 gnulib version of fdopendir is unable to guarantee that
49 dirfd(fdopendir(fd))==fd, but we can at least guarantee that if
50 they are not equal, the fd returned by dirfd is safe. */
51#if HAVE_FDOPENDIR || GNULIB_TEST_FDOPENDIR
52 int dfd;
53#endif
54
55 /* We close fd 2 later, so save it in fd 10. */
56 if (dup2 (STDERR_FILENO, BACKUP_STDERR_FILENO) != BACKUP_STDERR_FILENO
57 || (myerr = fdopen (BACKUP_STDERR_FILENO, "w")) == NULL)
58 return 2;
59
60#if HAVE_FDOPENDIR || GNULIB_TEST_FDOPENDIR
61 dfd = open (".", O_RDONLY);
62 ASSERT (STDERR_FILENO < dfd);
63#endif
64
65 /* Four iterations, with progressively more standard descriptors
66 closed. */
67 for (i = -1; i <= STDERR_FILENO; i++)
68 {
69 if (0 <= i)
70 ASSERT (close (i) == 0);
71 dp = opendir (".");
72 ASSERT (dp);
73 ASSERT (dirfd (dp) == -1 || STDERR_FILENO < dirfd (dp));
74 ASSERT (closedir (dp) == 0);
75
76#if HAVE_FDOPENDIR || GNULIB_TEST_FDOPENDIR
77 {
78 int fd = dup_safer (dfd);
79 ASSERT (STDERR_FILENO < fd);
80 dp = fdopendir (fd);
81 ASSERT (dp);
82 ASSERT (dirfd (dp) == -1 || STDERR_FILENO < dirfd (dp));
83 ASSERT (closedir (dp) == 0);
84 errno = 0;
85 ASSERT (close (fd) == -1);
86 ASSERT (errno == EBADF);
87 }
88#endif
89 }
90
91#if HAVE_FDOPENDIR || GNULIB_TEST_FDOPENDIR
92 ASSERT (close (dfd) == 0);
93#endif
94
95 return 0;
96}
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