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/* Copyright 2000-2004 The Apache Software Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "apr.h"
#include "apr_private.h"
#include "apr_general.h"
#include "apr_mmap.h"
#include "apr_errno.h"
#include "apr_arch_file_io.h"
#include "apr_portable.h"
#include "apr_strings.h"
#if APR_HAS_MMAP
static apr_status_t mmap_cleanup(void *themmap)
{
apr_mmap_t *mm = themmap;
apr_mmap_t *next = APR_RING_NEXT(mm,link);
apr_status_t rv = 0;
/* we no longer refer to the mmaped region */
APR_RING_REMOVE(mm,link);
APR_RING_NEXT(mm,link) = NULL;
APR_RING_PREV(mm,link) = NULL;
if (next != mm) {
/* more references exist, so we're done */
return APR_SUCCESS;
}
if (mm->mv) {
if (!UnmapViewOfFile(mm->mv))
{
apr_status_t rv = apr_get_os_error();
CloseHandle(mm->mhandle);
mm->mv = NULL;
mm->mhandle = NULL;
return rv;
}
mm->mv = NULL;
}
if (mm->mhandle)
{
if (!CloseHandle(mm->mhandle))
{
apr_status_t rv = apr_get_os_error();
CloseHandle(mm->mhandle);
mm->mhandle = NULL;
return rv;
}
mm->mhandle = NULL;
}
return APR_SUCCESS;
}
APR_DECLARE(apr_status_t) apr_mmap_create(apr_mmap_t **new, apr_file_t *file,
apr_off_t offset, apr_size_t size,
apr_int32_t flag, apr_pool_t *cont)
{
static DWORD memblock = 0;
DWORD fmaccess = 0;
DWORD mvaccess = 0;
DWORD offlo;
DWORD offhi;
if (size == 0)
return APR_EINVAL;
if (flag & APR_MMAP_WRITE)
fmaccess |= PAGE_READWRITE;
else if (flag & APR_MMAP_READ)
fmaccess |= PAGE_READONLY;
if (flag & APR_MMAP_READ)
mvaccess |= FILE_MAP_READ;
if (flag & APR_MMAP_WRITE)
mvaccess |= FILE_MAP_WRITE;
if (!file || !file->filehand || file->filehand == INVALID_HANDLE_VALUE
|| file->buffered)
return APR_EBADF;
if (!memblock)
{
SYSTEM_INFO si;
GetSystemInfo(&si);
memblock = si.dwAllocationGranularity;
}
*new = apr_pcalloc(cont, sizeof(apr_mmap_t));
(*new)->pstart = (offset / memblock) * memblock;
(*new)->poffset = offset - (*new)->pstart;
(*new)->psize = (apr_size_t)((*new)->poffset) + size;
/* The size of the CreateFileMapping object is the current size
* of the size of the mmap object (e.g. file size), not the size
* of the mapped region!
*/
(*new)->mhandle = CreateFileMapping(file->filehand, NULL, fmaccess,
0, 0, NULL);
if (!(*new)->mhandle || (*new)->mhandle == INVALID_HANDLE_VALUE)
{
*new = NULL;
return apr_get_os_error();
}
offlo = (DWORD)(*new)->pstart;
offhi = (DWORD)((*new)->pstart >> 32);
(*new)->mv = MapViewOfFile((*new)->mhandle, mvaccess, offhi,
offlo, (*new)->psize);
if (!(*new)->mv)
{
apr_status_t rv = apr_get_os_error();
CloseHandle((*new)->mhandle);
*new = NULL;
return rv;
}
(*new)->mm = (char*)((*new)->mv) + (*new)->poffset;
(*new)->size = size;
(*new)->cntxt = cont;
APR_RING_ELEM_INIT(*new, link);
/* register the cleanup... */
apr_pool_cleanup_register((*new)->cntxt, (void*)(*new), mmap_cleanup,
apr_pool_cleanup_null);
return APR_SUCCESS;
}
APR_DECLARE(apr_status_t) apr_mmap_dup(apr_mmap_t **new_mmap,
apr_mmap_t *old_mmap,
apr_pool_t *p)
{
*new_mmap = (apr_mmap_t *)apr_pmemdup(p, old_mmap, sizeof(apr_mmap_t));
(*new_mmap)->cntxt = p;
APR_RING_INSERT_AFTER(old_mmap, *new_mmap, link);
apr_pool_cleanup_register(p, *new_mmap, mmap_cleanup,
apr_pool_cleanup_null);
return APR_SUCCESS;
}
APR_DECLARE(apr_status_t) apr_mmap_delete(apr_mmap_t *mm)
{
return apr_pool_cleanup_run(mm->cntxt, mm, mmap_cleanup);
}
#endif
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