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/* Test that openat works.
Copyright (C) 2009-2023 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 <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 (_GL_UNUSED int argc, 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;
}
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