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57 lines
1.8 KiB
C
57 lines
1.8 KiB
C
/* msync -- Synchronize mapped memory to external storage. Mach version.
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Copyright (C) 2002-2020 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <sys/types.h>
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#include <sys/mman.h>
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#include <errno.h>
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#include <mach.h>
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/* Some Mach variants have vm_msync and some don't. Those that have it
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define the VM_SYNC_* bits when we include <mach/mach_types.h>. */
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#ifndef VM_SYNC_SYNCHRONOUS
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# include <misc/msync.c>
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#else
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/* Synchronize the region starting at ADDR and extending LEN bytes with the
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file it maps. Filesystem operations on a file being mapped are
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unpredictable before this is done. */
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int
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msync (void *addr, size_t len, int flags)
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{
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vm_sync_t sync_flags = 0;
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kern_return_t err;
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if (flags & MS_SYNC)
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sync_flags |= VM_SYNC_SYNCHRONOUS;
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if (flags & MS_ASYNC)
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sync_flags |= VM_SYNC_ASYNCHRONOUS;
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if (flags & MS_INVALIDATE)
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sync_flags |= VM_SYNC_INVALIDATE;
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if (err = __vm_msync (__mach_task_self (),
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(vm_address_t) addr, (vm_size_t) len, sync_flags))
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{
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errno = err;
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return -1;
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}
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return 0;
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}
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#endif
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