Mercurial > gnulib
view tests/test-dirent-safer.c @ 17249:e542fd46ad6f
maint: update all copyright year number ranges
Run "make update-copyright". Compare to commit 1602f0a from last year.
Signed-off-by: Eric Blake <eblake@redhat.com>
author | Eric Blake <eblake@redhat.com> |
---|---|
date | Tue, 01 Jan 2013 00:50:58 +0000 |
parents | 8250f2777afc |
children | 344018b6e5d7 |
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/* Test that directory streams leave standard fds alone. Copyright (C) 2009-2013 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 <http://www.gnu.org/licenses/>. */ /* Written by Eric Blake <ebb9@byu.net>, 2009. */ #include <config.h> #include "dirent--.h" #include <errno.h> #include <fcntl.h> #include <stdio.h> #include <unistd.h> #include "unistd-safer.h" /* This test intentionally closes stderr. So, we arrange to have fd 10 (outside the range of interesting fd's during the test) set up to duplicate the original stderr. */ #define BACKUP_STDERR_FILENO 10 #define ASSERT_STREAM myerr #include "macros.h" static FILE *myerr; int main (void) { int i; DIR *dp; /* The dirent-safer module works without the use of fdopendir (which would also pull in fchdir and openat); but if those modules were also used, we ensure that they are safe. In particular, the gnulib version of fdopendir is unable to guarantee that dirfd(fdopendir(fd))==fd, but we can at least guarantee that if they are not equal, the fd returned by dirfd is safe. */ #if HAVE_FDOPENDIR || GNULIB_TEST_FDOPENDIR int dfd; #endif /* We close fd 2 later, so save it in fd 10. */ if (dup2 (STDERR_FILENO, BACKUP_STDERR_FILENO) != BACKUP_STDERR_FILENO || (myerr = fdopen (BACKUP_STDERR_FILENO, "w")) == NULL) return 2; #if HAVE_FDOPENDIR || GNULIB_TEST_FDOPENDIR dfd = open (".", O_RDONLY); ASSERT (STDERR_FILENO < dfd); #endif /* Four iterations, with progressively more standard descriptors closed. */ for (i = -1; i <= STDERR_FILENO; i++) { if (0 <= i) ASSERT (close (i) == 0); dp = opendir ("."); ASSERT (dp); ASSERT (dirfd (dp) == -1 || STDERR_FILENO < dirfd (dp)); ASSERT (closedir (dp) == 0); #if HAVE_FDOPENDIR || GNULIB_TEST_FDOPENDIR { int fd = dup_safer (dfd); ASSERT (STDERR_FILENO < fd); dp = fdopendir (fd); ASSERT (dp); ASSERT (dirfd (dp) == -1 || STDERR_FILENO < dirfd (dp)); ASSERT (closedir (dp) == 0); errno = 0; ASSERT (close (fd) == -1); ASSERT (errno == EBADF); } #endif } #if HAVE_FDOPENDIR || GNULIB_TEST_FDOPENDIR ASSERT (close (dfd) == 0); #endif return 0; }