/* msync -- Synchronize mapped memory to external storage.  Mach version.

   Copyright (C) 2002-2018 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 <sys/types.h>

#include <sys/mman.h>

#include <errno.h>

#include <mach.h>

/* Some Mach variants have vm_msync and some don't.  Those that have it

   define the VM_SYNC_* bits when we include <mach/mach_types.h>.  */

#ifndef VM_SYNC_SYNCHRONOUS

# include <misc/msync.c>

#else

/* Synchronize the region starting at ADDR and extending LEN bytes with the

   file it maps.  Filesystem operations on a file being mapped are

   unpredictable before this is done.  */

int

msync (void *addr, size_t len, int flags)

{

  vm_sync_t sync_flags = 0;

  kern_return_t err;

  if (flags & MS_SYNC)

    sync_flags |= VM_SYNC_SYNCHRONOUS;

  if (flags & MS_ASYNC)

    sync_flags |= VM_SYNC_ASYNCHRONOUS;

  if (flags & MS_INVALIDATE)

    sync_flags |= VM_SYNC_INVALIDATE;

  if (err = __vm_msync (__mach_task_self (),

			(vm_address_t) addr, (vm_size_t) len, sync_flags))

    {

      errno = err;

      return -1;

    }

  return 0;

}

#endif