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94 lines
2.4 KiB
C
94 lines
2.4 KiB
C
/* msync -- Synchronize mapped memory to external storage. Mach version.
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Copyright (C) 2002-2018 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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<http://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 <hurd/hurd.h>
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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 length, int flags)
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{
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boolean_t should_flush = flags & MS_INVALIDATE ? 1 : 0;
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boolean_t should_iosync = flags & MS_ASYNC ? 0 : 1;
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vm_address_t cur = (vm_address_t) addr;
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vm_address_t target = cur + length;
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vm_size_t len;
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vm_prot_t prot;
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vm_prot_t max_prot;
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vm_inherit_t inherit;
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boolean_t shared;
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memory_object_name_t obj;
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vm_offset_t offset;
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kern_return_t err;
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if (flags & (MS_SYNC | MS_ASYNC) == (MS_SYNC | MS_ASYNC))
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return __hurd_fail (EINVAL);
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while (cur < target)
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{
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vm_address_t begin = cur;
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err = __vm_region (__mach_task_self (),
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&begin, &len, &prot, &max_prot, &inherit,
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&shared, &obj, &offset);
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if (err != KERN_SUCCESS)
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return __hurd_fail (err);
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if (begin > cur)
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/* We were given an address before the first region,
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or we found a hole. */
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cur = begin;
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if (cur >= target)
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/* We were given an ending address within a hole. */
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break;
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if (MACH_PORT_VALID (obj))
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{
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vm_size_t sync_len;
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if (begin + len > target)
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sync_len = target - begin;
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else
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sync_len = len;
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err = __vm_object_sync (obj, cur - begin + offset, sync_len,
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should_flush, 1, should_iosync);
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__mach_port_deallocate (__mach_task_self (), obj);
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if (err)
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return __hurd_fail (err);
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}
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cur = begin + len;
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}
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return 0;
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}
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