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/* msync -- Synchronize mapped memory to external storage. Mach version.
Copyright (C) 2002-2020 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
<https://www.gnu.org/licenses/>. */
#include <sys/types.h>
#include <sys/mman.h>
#include <errno.h>
#include <mach.h>
#include <sysdep-cancel.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;
int cancel_oldtype;
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;
cancel_oldtype = LIBC_CANCEL_ASYNC();
err = __vm_msync (__mach_task_self (),
(vm_address_t) addr, (vm_size_t) len, sync_flags);
LIBC_CANCEL_RESET (cancel_oldtype);
if (err)
{
errno = err;
return -1;
}
return 0;
}
#endif
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