| 1 | /* msync -- Synchronize mapped memory to external storage. Mach version. |
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| 2 | Copyright (C) 2002-2022 Free Software Foundation, Inc. |
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| 3 | This file is part of the GNU C Library. |
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| 4 | |
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| 5 | The GNU C Library is free software; you can redistribute it and/or |
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| 6 | modify it under the terms of the GNU Lesser General Public |
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| 7 | License as published by the Free Software Foundation; either |
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| 8 | version 2.1 of the License, or (at your option) any later version. |
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| 9 | |
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| 10 | The GNU C Library is distributed in the hope that it will be useful, |
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 13 | Lesser General Public License for more details. |
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| 14 | |
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| 15 | You should have received a copy of the GNU Lesser General Public |
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| 16 | License along with the GNU C Library; if not, see |
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| 17 | <https://www.gnu.org/licenses/>. */ |
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| 18 | |
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| 19 | #include <sys/types.h> |
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| 20 | #include <sys/mman.h> |
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| 21 | #include <errno.h> |
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| 22 | #include <mach.h> |
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| 23 | #include <sysdep-cancel.h> |
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| 24 | |
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| 25 | /* Some Mach variants have vm_msync and some don't. Those that have it |
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| 26 | define the VM_SYNC_* bits when we include <mach/mach_types.h>. */ |
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| 27 | |
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| 28 | #ifndef VM_SYNC_SYNCHRONOUS |
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| 29 | # include <misc/msync.c> |
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| 30 | #else |
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| 31 | |
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| 32 | /* Synchronize the region starting at ADDR and extending LEN bytes with the |
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| 33 | file it maps. Filesystem operations on a file being mapped are |
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| 34 | unpredictable before this is done. */ |
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| 35 | |
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| 36 | int |
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| 37 | msync (void *addr, size_t len, int flags) |
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| 38 | { |
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| 39 | vm_sync_t sync_flags = 0; |
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| 40 | kern_return_t err; |
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| 41 | int cancel_oldtype; |
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| 42 | |
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| 43 | if (flags & MS_SYNC) |
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| 44 | sync_flags |= VM_SYNC_SYNCHRONOUS; |
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| 45 | if (flags & MS_ASYNC) |
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| 46 | sync_flags |= VM_SYNC_ASYNCHRONOUS; |
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| 47 | if (flags & MS_INVALIDATE) |
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| 48 | sync_flags |= VM_SYNC_INVALIDATE; |
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| 49 | |
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| 50 | cancel_oldtype = LIBC_CANCEL_ASYNC(); |
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| 51 | err = __vm_msync (__mach_task_self (), |
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| 52 | (vm_address_t) addr, (vm_size_t) len, sync_flags); |
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| 53 | LIBC_CANCEL_RESET (cancel_oldtype); |
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| 54 | if (err) |
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| 55 | { |
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| 56 | errno = err; |
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| 57 | return -1; |
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| 58 | } |
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| 59 | return 0; |
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| 60 | } |
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| 61 | #endif |
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| 62 | |
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