nativelibc/posix-io/fsync.c

/*	A part of the Native C Library for Windows NT
	Copyright 2007-2015 PC GO Ld.

	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 2 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.
*/

#include <unistd.h>
#include <windows.h>
#include <nt.h>
#include <errno.h>
#include <ntstatus.h>

int fsync(int fd) {
	if(fd == STDOUT_FILENO || fd == STDERR_FILENO) {
		int real_fd = (fd == STDOUT_FILENO ? _get_stdout_fd : _get_stderr_fd)();
		switch(real_fd) {
			case TTY_FD_INVALID:
				errno = EBADF;
				return -1;
			case TTY_FD_DEFAULT:
				errno = EINVAL;
				return -1;
		}
		fd = real_fd;
	}

	IO_STATUS_BLOCK io_status;
	long int status = NtFlushBuffersFile((void *)fd, &io_status);
	return __set_errno_from_ntstatus(status) ? -1 : 0;
}