| /* Test that openat works. |
| Copyright (C) 2009-2021 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 <https://www.gnu.org/licenses/>. */ |
| |
| /* Written by Eric Blake <ebb9@byu.net>, 2009. */ |
| |
| #include <config.h> |
| |
| #include <fcntl.h> |
| |
| #include "signature.h" |
| SIGNATURE_CHECK (openat, int, (int, char const *, int, ...)); |
| |
| #include <errno.h> |
| #include <stdarg.h> |
| #include <stdbool.h> |
| #include <stdio.h> |
| #include <unistd.h> |
| |
| #include "macros.h" |
| |
| #define BASE "test-openat.t" |
| |
| #include "test-open.h" |
| |
| static int dfd = AT_FDCWD; |
| |
| /* Wrapper around openat to test open behavior. */ |
| static int |
| do_open (char const *name, int flags, ...) |
| { |
| if (flags & O_CREAT) |
| { |
| mode_t mode = 0; |
| va_list arg; |
| va_start (arg, flags); |
| |
| /* We have to use PROMOTED_MODE_T instead of mode_t, otherwise GCC 4 |
| creates crashing code when 'mode_t' is smaller than 'int'. */ |
| mode = va_arg (arg, PROMOTED_MODE_T); |
| |
| va_end (arg); |
| return openat (dfd, name, flags, mode); |
| } |
| return openat (dfd, name, flags); |
| } |
| |
| int |
| main (int argc _GL_UNUSED, char *argv[]) |
| { |
| int result; |
| |
| /* Test behaviour for invalid file descriptors. */ |
| { |
| errno = 0; |
| ASSERT (openat (-1, "foo", O_RDONLY) == -1); |
| ASSERT (errno == EBADF); |
| } |
| { |
| close (99); |
| errno = 0; |
| ASSERT (openat (99, "foo", O_RDONLY) == -1); |
| ASSERT (errno == EBADF); |
| } |
| |
| /* Basic checks. */ |
| result = test_open (do_open, false); |
| dfd = open (".", O_RDONLY); |
| ASSERT (0 <= dfd); |
| ASSERT (test_open (do_open, false) == result); |
| ASSERT (close (dfd) == 0); |
| |
| /* Check that even when *-safer modules are in use, plain openat can |
| land in fd 0. Do this test last, since it is destructive to |
| stdin. */ |
| ASSERT (close (STDIN_FILENO) == 0); |
| ASSERT (openat (AT_FDCWD, ".", O_RDONLY) == STDIN_FILENO); |
| { |
| dfd = open (".", O_RDONLY); |
| ASSERT (STDIN_FILENO < dfd); |
| ASSERT (chdir ("..") == 0); |
| ASSERT (close (STDIN_FILENO) == 0); |
| ASSERT (openat (dfd, ".", O_RDONLY) == STDIN_FILENO); |
| ASSERT (close (dfd) == 0); |
| } |
| return result; |
| } |