mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-23 13:30:06 +00:00
95 lines
2.5 KiB
C
95 lines
2.5 KiB
C
/* msync -- Synchronize mapped memory to external storage. Mach version.
|
|
Copyright (C) 2002-2023 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#include <sys/types.h>
|
|
#include <sys/mman.h>
|
|
#include <errno.h>
|
|
#include <sysdep-cancel.h>
|
|
|
|
#include <hurd/hurd.h>
|
|
|
|
/* Synchronize the region starting at ADDR and extending LEN bytes with the
|
|
file it maps. Filesystem operations on a file being mapped are
|
|
unpredictable before this is done. */
|
|
|
|
int
|
|
msync (void *addr, size_t length, int flags)
|
|
{
|
|
boolean_t should_flush = flags & MS_INVALIDATE ? 1 : 0;
|
|
boolean_t should_iosync = flags & MS_ASYNC ? 0 : 1;
|
|
|
|
vm_address_t cur = (vm_address_t) addr;
|
|
vm_address_t target = cur + length;
|
|
|
|
vm_size_t len;
|
|
vm_prot_t prot;
|
|
vm_prot_t max_prot;
|
|
vm_inherit_t inherit;
|
|
boolean_t shared;
|
|
memory_object_name_t obj;
|
|
vm_offset_t offset;
|
|
|
|
kern_return_t err;
|
|
int cancel_oldtype;
|
|
|
|
while (cur < target)
|
|
{
|
|
vm_address_t begin = cur;
|
|
|
|
err = __vm_region (__mach_task_self (),
|
|
&begin, &len, &prot, &max_prot, &inherit,
|
|
&shared, &obj, &offset);
|
|
|
|
if (err != KERN_SUCCESS)
|
|
return __hurd_fail (err);
|
|
|
|
if (begin > cur)
|
|
/* We were given an address before the first region,
|
|
or we found a hole. */
|
|
cur = begin;
|
|
|
|
if (cur >= target)
|
|
/* We were given an ending address within a hole. */
|
|
break;
|
|
|
|
if (MACH_PORT_VALID (obj))
|
|
{
|
|
vm_size_t sync_len;
|
|
|
|
if (begin + len > target)
|
|
sync_len = target - begin;
|
|
else
|
|
sync_len = len;
|
|
|
|
cancel_oldtype = LIBC_CANCEL_ASYNC();
|
|
err = __vm_object_sync (obj, cur - begin + offset, sync_len,
|
|
should_flush, 1, should_iosync);
|
|
LIBC_CANCEL_RESET (cancel_oldtype);
|
|
__mach_port_deallocate (__mach_task_self (), obj);
|
|
|
|
if (err)
|
|
return __hurd_fail (err);
|
|
|
|
}
|
|
|
|
cur = begin + len;
|
|
}
|
|
|
|
return 0;
|
|
}
|