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1/* msync -- Synchronize mapped memory to external storage. Mach version.
2 Copyright (C) 2002-2019 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <http://www.gnu.org/licenses/>. */
18
19#include <sys/types.h>
20#include <sys/mman.h>
21#include <errno.h>
22#include <mach.h>
23
24/* Some Mach variants have vm_msync and some don't. Those that have it
25 define the VM_SYNC_* bits when we include <mach/mach_types.h>. */
26
27#ifndef VM_SYNC_SYNCHRONOUS
28# include <misc/msync.c>
29#else
30
31/* Synchronize the region starting at ADDR and extending LEN bytes with the
32 file it maps. Filesystem operations on a file being mapped are
33 unpredictable before this is done. */
34
35int
36msync (void *addr, size_t len, int flags)
37{
38 vm_sync_t sync_flags = 0;
39 kern_return_t err;
40
41 if (flags & MS_SYNC)
42 sync_flags |= VM_SYNC_SYNCHRONOUS;
43 if (flags & MS_ASYNC)
44 sync_flags |= VM_SYNC_ASYNCHRONOUS;
45 if (flags & MS_INVALIDATE)
46 sync_flags |= VM_SYNC_INVALIDATE;
47
48 if (err = __vm_msync (__mach_task_self (),
49 (vm_address_t) addr, (vm_size_t) len, sync_flags))
50 {
51 errno = err;
52 return -1;
53 }
54 return 0;
55}
56#endif
57

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