glibc/sysdeps/mach/hurd/fsync.c

/* Copyright (C) 1991-2013 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library 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
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <http://www.gnu.org/licenses/>.  */

#include <errno.h>
#include <unistd.h>
#include <hurd.h>
#include <hurd/fd.h>

/* Make all changes done to FD actually appear on disk.  */
int
fsync (fd)
     int fd;
{
  error_t err = HURD_DPORT_USE (fd, __file_sync (port, 1, 0));
  if (err)
    {
      if (err == EOPNOTSUPP)
	/* If the file descriptor does not support sync, return EINVAL
	   as POSIX specifies.  */
	err = EINVAL;
      return __hurd_dfail (fd, err);
    }
  return 0;
}