1 /* Test that directory streams leave standard fds alone.
2 Copyright (C) 2009 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 <http://www.gnu.org/licenses/>. */
17 /* Written by Eric Blake <ebb9@byu.net>, 2009. */
29 #include "unistd-safer.h"
31 /* This test intentionally closes stderr. So, we arrange to have fd 10
32 (outside the range of interesting fd's during the test) set up to
33 duplicate the original stderr. */
35 #define BACKUP_STDERR_FILENO 10
38 #define ASSERT(expr) \
43 fprintf (myerr, "%s:%d: assertion failed\n", __FILE__, __LINE__); \
55 /* The dirent-safer module works without the use of fdopendir (which
56 would also pull in fchdir and openat); but if those modules were
57 also used, we ensure that they are safe. In particular, the
58 gnulib version of fdopendir is unable to guarantee that
59 dirfd(fdopendir(fd))==fd, but we can at least guarantee that if
60 they are not equal, the fd returned by dirfd is safe. */
61 #if HAVE_FDOPENDIR || GNULIB_FDOPENDIR
65 /* We close fd 2 later, so save it in fd 10. */
66 if (dup2 (STDERR_FILENO, BACKUP_STDERR_FILENO) != BACKUP_STDERR_FILENO
67 || (myerr = fdopen (BACKUP_STDERR_FILENO, "w")) == NULL)
70 #if HAVE_FDOPENDIR || GNULIB_FDOPENDIR
71 dfd = open (".", O_RDONLY);
72 ASSERT (STDERR_FILENO < dfd);
75 /* Four iterations, with progressively more standard descriptors
77 for (i = -1; i <= STDERR_FILENO; i++)
80 ASSERT (close (i) == 0);
83 ASSERT (dirfd (dp) == -1 || STDERR_FILENO < dirfd (dp));
84 ASSERT (closedir (dp) == 0);
86 #if HAVE_FDOPENDIR || GNULIB_FDOPENDIR
88 int fd = dup_safer (dfd);
89 ASSERT (STDERR_FILENO < fd);
92 ASSERT (dirfd (dp) == -1 || STDERR_FILENO < dirfd (dp));
93 ASSERT (closedir (dp) == 0);
95 ASSERT (close (fd) == -1);
96 ASSERT (errno == EBADF);
101 #if HAVE_FDOPENDIR || GNULIB_FDOPENDIR
102 ASSERT (close (dfd) == 0);