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/* Test of fsync() function.
Copyright (C) 2008-2023 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/>. */
#include <config.h>
#include <unistd.h>
#include "signature.h"
SIGNATURE_CHECK (fsync, int, (int));
#include <errno.h>
#include <fcntl.h>
#include "macros.h"
int
main (void)
{
int fd;
const char *file = "test-fsync.txt";
/* Assuming stdin and stdout are ttys, fsync is allowed to fail, but
may succeed as an extension. */
for (fd = 0; fd < 2; fd++)
if (fsync (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 */
);
}
/* fsync must fail on invalid fd. */
{
errno = 0;
ASSERT (fsync (-1) == -1);
ASSERT (errno == EBADF);
}
{
close (99);
errno = 0;
ASSERT (fsync (99) == -1);
ASSERT (errno == EBADF);
}
fd = open (file, O_WRONLY|O_CREAT|O_TRUNC, 0644);
ASSERT (0 <= fd);
ASSERT (write (fd, "hello", 5) == 5);
ASSERT (fsync (fd) == 0);
ASSERT (close (fd) == 0);
/* For a read-only regular file input file descriptor, fsync should
succeed (since at least atime changes can be synchronized).
On AIX and Cygwin, this test would fail. */
#if !(defined _AIX || defined __CYGWIN__)
fd = open (file, O_RDONLY);
ASSERT (0 <= fd);
{
char buf[1];
ASSERT (read (fd, buf, sizeof buf) == sizeof buf);
}
ASSERT (fsync (fd) == 0);
ASSERT (close (fd) == 0);
#endif
ASSERT (unlink (file) == 0);
return 0;
}
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