| 1 | /* Test that directory streams leave standard fds alone.
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| 2 | Copyright (C) 2009-2012 Free Software Foundation, Inc.
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| 3 |
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| 4 | This program is free software: you can redistribute it and/or modify
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| 5 | it under the terms of the GNU General Public License as published by
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| 6 | the Free Software Foundation; either version 3 of the License, or
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| 7 | (at your option) any later version.
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| 8 |
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| 9 | This program is distributed in the hope that it will be useful,
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| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 12 | GNU General Public License for more details.
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| 13 |
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| 14 | You should have received a copy of the GNU General Public License
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| 15 | along with this program. If not, see <http://www.gnu.org/licenses/>. */
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| 16 |
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| 17 | /* Written by Eric Blake <ebb9@byu.net>, 2009. */
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| 18 |
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| 19 | #include <config.h>
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| 20 |
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| 21 | #include "dirent--.h"
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| 22 |
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| 23 | #include <errno.h>
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| 24 | #include <fcntl.h>
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| 25 | #include <stdio.h>
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| 26 | #include <unistd.h>
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| 27 |
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| 28 | #include "unistd-safer.h"
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| 29 |
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| 30 | /* This test intentionally closes stderr. So, we arrange to have fd 10
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| 31 | (outside the range of interesting fd's during the test) set up to
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| 32 | duplicate the original stderr. */
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| 33 |
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| 34 | #define BACKUP_STDERR_FILENO 10
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| 35 | #define ASSERT_STREAM myerr
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| 36 | #include "macros.h"
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| 37 |
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| 38 | static FILE *myerr;
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| 39 |
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| 40 | int
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| 41 | main (void)
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| 42 | {
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| 43 | int i;
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| 44 | DIR *dp;
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| 45 | /* The dirent-safer module works without the use of fdopendir (which
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| 46 | would also pull in fchdir and openat); but if those modules were
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| 47 | also used, we ensure that they are safe. In particular, the
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| 48 | gnulib version of fdopendir is unable to guarantee that
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| 49 | dirfd(fdopendir(fd))==fd, but we can at least guarantee that if
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| 50 | they are not equal, the fd returned by dirfd is safe. */
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| 51 | #if HAVE_FDOPENDIR || GNULIB_TEST_FDOPENDIR
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| 52 | int dfd;
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| 53 | #endif
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| 54 |
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| 55 | /* We close fd 2 later, so save it in fd 10. */
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| 56 | if (dup2 (STDERR_FILENO, BACKUP_STDERR_FILENO) != BACKUP_STDERR_FILENO
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| 57 | || (myerr = fdopen (BACKUP_STDERR_FILENO, "w")) == NULL)
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| 58 | return 2;
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| 59 |
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| 60 | #if HAVE_FDOPENDIR || GNULIB_TEST_FDOPENDIR
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| 61 | dfd = open (".", O_RDONLY);
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| 62 | ASSERT (STDERR_FILENO < dfd);
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| 63 | #endif
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| 64 |
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| 65 | /* Four iterations, with progressively more standard descriptors
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| 66 | closed. */
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| 67 | for (i = -1; i <= STDERR_FILENO; i++)
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| 68 | {
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| 69 | if (0 <= i)
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| 70 | ASSERT (close (i) == 0);
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| 71 | dp = opendir (".");
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| 72 | ASSERT (dp);
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| 73 | ASSERT (dirfd (dp) == -1 || STDERR_FILENO < dirfd (dp));
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| 74 | ASSERT (closedir (dp) == 0);
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| 75 |
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| 76 | #if HAVE_FDOPENDIR || GNULIB_TEST_FDOPENDIR
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| 77 | {
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| 78 | int fd = dup_safer (dfd);
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| 79 | ASSERT (STDERR_FILENO < fd);
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| 80 | dp = fdopendir (fd);
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| 81 | ASSERT (dp);
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| 82 | ASSERT (dirfd (dp) == -1 || STDERR_FILENO < dirfd (dp));
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| 83 | ASSERT (closedir (dp) == 0);
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| 84 | errno = 0;
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| 85 | ASSERT (close (fd) == -1);
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| 86 | ASSERT (errno == EBADF);
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| 87 | }
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| 88 | #endif
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| 89 | }
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| 90 |
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| 91 | #if HAVE_FDOPENDIR || GNULIB_TEST_FDOPENDIR
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| 92 | ASSERT (close (dfd) == 0);
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| 93 | #endif
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| 94 |
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| 95 | return 0;
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| 96 | }
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