1 /* msync -- Synchronize mapped memory to external storage. Mach version.
2 Copyright (C) 2002-2022 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 <https://www.gnu.org/licenses/>. */
18
19 #include <sys/types.h>
20 #include <sys/mman.h>
21 #include <errno.h>
22 #include <mach.h>
23 #include <sysdep-cancel.h>
24
25 /* Some Mach variants have vm_msync and some don't. Those that have it
26 define the VM_SYNC_* bits when we include <mach/mach_types.h>. */
27
28 #ifndef VM_SYNC_SYNCHRONOUS
29 # include <misc/msync.c>
30 #else
31
32 /* Synchronize the region starting at ADDR and extending LEN bytes with the
33 file it maps. Filesystem operations on a file being mapped are
34 unpredictable before this is done. */
35
36 int
msync(void * addr,size_t len,int flags)37 msync (void *addr, size_t len, int flags)
38 {
39 vm_sync_t sync_flags = 0;
40 kern_return_t err;
41 int cancel_oldtype;
42
43 if (flags & MS_SYNC)
44 sync_flags |= VM_SYNC_SYNCHRONOUS;
45 if (flags & MS_ASYNC)
46 sync_flags |= VM_SYNC_ASYNCHRONOUS;
47 if (flags & MS_INVALIDATE)
48 sync_flags |= VM_SYNC_INVALIDATE;
49
50 cancel_oldtype = LIBC_CANCEL_ASYNC();
51 err = __vm_msync (__mach_task_self (),
52 (vm_address_t) addr, (vm_size_t) len, sync_flags);
53 LIBC_CANCEL_RESET (cancel_oldtype);
54 if (err)
55 {
56 errno = err;
57 return -1;
58 }
59 return 0;
60 }
61 #endif
62