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/* Test of fdatasync() function.
Copyright (C) 2008-2026 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/>. */
#include <config.h>
#include <unistd.h>
#include "signature.h"
SIGNATURE_CHECK (fdatasync, int, (int));
#include <errno.h>
#include <fcntl.h>
#include "macros.h"
int
main (void)
{
const char *file = "test-fdatasync.txt";
/* Assuming stdin and stdout are ttys, fdatasync is allowed to fail, but
may succeed as an extension. */
for (int fd = 0; fd < 2; fd++)
if (fdatasync (fd) != 0)
{
ASSERT (errno == EINVAL /* POSIX */
|| errno == ENOTSUP /* seen on Mac OS X 10.5 */
|| errno == EBADF /* seen on AIX 7.1 */
|| errno == EIO /* seen on mingw */
);
}
/* fdatasync must fail on invalid fd. */
{
errno = 0;
ASSERT (fdatasync (-1) == -1);
ASSERT (errno == EBADF);
}
{
close (99);
errno = 0;
ASSERT (fdatasync (99) == -1);
ASSERT (errno == EBADF);
}
#ifdef AT_FDCWD
{
errno = 0;
ASSERT (fdatasync (AT_FDCWD) == -1);
ASSERT (errno == EBADF);
}
#endif
{
int fd = open (file, O_WRONLY|O_CREAT|O_TRUNC, 0644);
ASSERT (0 <= fd);
ASSERT (write (fd, "hello", 5) == 5);
ASSERT (fdatasync (fd) == 0);
ASSERT (close (fd) == 0);
}
#if 0
/* POSIX is self-contradictory on whether fdatasync must fail on
read-only file descriptors. Glibc allows it, as does our
implementation if fsync allows it. */
{
int fd = open (file, O_RDONLY);
ASSERT (0 <= fd);
errno = 0;
ASSERT (fdatasync (fd) == -1);
ASSERT (errno == EBADF);
ASSERT (close (fd) == 0);
}
#endif
ASSERT (unlink (file) == 0);
return test_exit_status;
}
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