1 /* Licensed to the Apache Software Foundation (ASF) under one or more
2 * contributor license agreements. See the NOTICE file distributed with
3 * this work for additional information regarding copyright ownership.
4 * The ASF licenses this file to You under the Apache License, Version 2.0
5 * (the "License"); you may not use this file except in compliance with
6 * the License. You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
18 #include "apr_private.h"
19 #include "apr_general.h"
21 #include "apr_errno.h"
22 #include "apr_arch_file_io.h"
23 #include "apr_portable.h"
24 #include "apr_strings.h"
28 static apr_status_t mmap_cleanup(void *themmap)
30 apr_mmap_t *mm = themmap;
31 apr_mmap_t *next = APR_RING_NEXT(mm,link);
34 /* we no longer refer to the mmaped region */
35 APR_RING_REMOVE(mm,link);
36 APR_RING_NEXT(mm,link) = NULL;
37 APR_RING_PREV(mm,link) = NULL;
40 /* more references exist, so we're done */
45 if (!UnmapViewOfFile(mm->mv))
47 apr_status_t rv = apr_get_os_error();
48 CloseHandle(mm->mhandle);
57 if (!CloseHandle(mm->mhandle))
59 apr_status_t rv = apr_get_os_error();
60 CloseHandle(mm->mhandle);
69 APR_DECLARE(apr_status_t) apr_mmap_create(apr_mmap_t **new, apr_file_t *file,
70 apr_off_t offset, apr_size_t size,
71 apr_int32_t flag, apr_pool_t *cont)
73 static DWORD memblock = 0;
82 if (flag & APR_MMAP_WRITE)
83 fmaccess |= PAGE_READWRITE;
84 else if (flag & APR_MMAP_READ)
85 fmaccess |= PAGE_READONLY;
87 if (flag & APR_MMAP_READ)
88 mvaccess |= FILE_MAP_READ;
89 if (flag & APR_MMAP_WRITE)
90 mvaccess |= FILE_MAP_WRITE;
92 if (!file || !file->filehand || file->filehand == INVALID_HANDLE_VALUE
100 memblock = si.dwAllocationGranularity;
103 *new = apr_pcalloc(cont, sizeof(apr_mmap_t));
104 (*new)->pstart = (offset / memblock) * memblock;
105 (*new)->poffset = offset - (*new)->pstart;
106 (*new)->psize = (apr_size_t)((*new)->poffset) + size;
107 /* The size of the CreateFileMapping object is the current size
108 * of the size of the mmap object (e.g. file size), not the size
109 * of the mapped region!
112 (*new)->mhandle = CreateFileMapping(file->filehand, NULL, fmaccess,
114 if (!(*new)->mhandle || (*new)->mhandle == INVALID_HANDLE_VALUE)
117 return apr_get_os_error();
120 offlo = (DWORD)(*new)->pstart;
121 offhi = (DWORD)((*new)->pstart >> 32);
122 (*new)->mv = MapViewOfFile((*new)->mhandle, mvaccess, offhi,
123 offlo, (*new)->psize);
126 apr_status_t rv = apr_get_os_error();
127 CloseHandle((*new)->mhandle);
132 (*new)->mm = (char*)((*new)->mv) + (*new)->poffset;
134 (*new)->cntxt = cont;
135 APR_RING_ELEM_INIT(*new, link);
137 /* register the cleanup... */
138 apr_pool_cleanup_register((*new)->cntxt, (void*)(*new), mmap_cleanup,
139 apr_pool_cleanup_null);
143 APR_DECLARE(apr_status_t) apr_mmap_dup(apr_mmap_t **new_mmap,
144 apr_mmap_t *old_mmap,
146 int transfer_ownership)
148 *new_mmap = (apr_mmap_t *)apr_pmemdup(p, old_mmap, sizeof(apr_mmap_t));
149 (*new_mmap)->cntxt = p;
151 APR_RING_INSERT_AFTER(old_mmap, *new_mmap, link);
153 apr_pool_cleanup_register(p, *new_mmap, mmap_cleanup,
154 apr_pool_cleanup_null);
158 APR_DECLARE(apr_status_t) apr_mmap_delete(apr_mmap_t *mm)
160 return apr_pool_cleanup_run(mm->cntxt, mm, mmap_cleanup);