/src/httpd/srclib/apr/mmap/unix/mmap.c
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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 |
7 | | * |
8 | | * http://www.apache.org/licenses/LICENSE-2.0 |
9 | | * |
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. |
15 | | */ |
16 | | |
17 | | #include <assert.h> |
18 | | |
19 | | #include "apr.h" |
20 | | #include "apr_private.h" |
21 | | #include "apr_general.h" |
22 | | #include "apr_strings.h" |
23 | | #include "apr_mmap.h" |
24 | | #include "apr_errno.h" |
25 | | #include "apr_arch_file_io.h" |
26 | | #include "apr_portable.h" |
27 | | |
28 | | /* System headers required for the mmap library */ |
29 | | #ifdef BEOS |
30 | | #include <kernel/OS.h> |
31 | | #endif |
32 | | #if APR_HAVE_STRING_H |
33 | | #include <string.h> |
34 | | #endif |
35 | | #if APR_HAVE_STDIO_H |
36 | | #include <stdio.h> |
37 | | #endif |
38 | | #if APR_HAVE_UNISTD_H |
39 | | #include <unistd.h> /* for sysconf() */ |
40 | | #endif |
41 | | #ifdef HAVE_SYS_STAT_H |
42 | | #include <sys/stat.h> |
43 | | #endif |
44 | | #ifdef HAVE_SYS_MMAN_H |
45 | | #include <sys/mman.h> |
46 | | #endif |
47 | | |
48 | | #if APR_HAS_MMAP || defined(BEOS) |
49 | | |
50 | | static apr_status_t mmap_cleanup(void *themmap) |
51 | 0 | { |
52 | 0 | apr_mmap_t *mm = themmap; |
53 | 0 | apr_mmap_t *next = APR_RING_NEXT(mm,link); |
54 | 0 | int rv = 0; |
55 | | |
56 | | /* we no longer refer to the mmaped region */ |
57 | 0 | APR_RING_REMOVE(mm,link); |
58 | 0 | APR_RING_NEXT(mm,link) = NULL; |
59 | 0 | APR_RING_PREV(mm,link) = NULL; |
60 | |
|
61 | 0 | if (next != mm) { |
62 | | /* more references exist, so we're done */ |
63 | 0 | return APR_SUCCESS; |
64 | 0 | } |
65 | | |
66 | | #ifdef BEOS |
67 | | rv = delete_area(mm->area); |
68 | | #else |
69 | 0 | rv = munmap((char *)mm->mm - mm->poffset, mm->size + mm->poffset); |
70 | 0 | #endif |
71 | 0 | mm->mm = (void *)-1; |
72 | |
|
73 | 0 | if (rv == 0) { |
74 | 0 | return APR_SUCCESS; |
75 | 0 | } |
76 | 0 | return errno; |
77 | 0 | } |
78 | | |
79 | | APR_DECLARE(apr_status_t) apr_mmap_create(apr_mmap_t **new, |
80 | | apr_file_t *file, apr_off_t offset, |
81 | | apr_size_t size, apr_int32_t flag, |
82 | | apr_pool_t *cont) |
83 | 0 | { |
84 | 0 | void *mm; |
85 | | #ifdef BEOS |
86 | | area_id aid = -1; |
87 | | uint32 pages = 0; |
88 | | #else |
89 | 0 | static long psize; |
90 | 0 | apr_off_t poffset = 0; |
91 | 0 | apr_int32_t native_flags = 0; |
92 | 0 | #endif |
93 | |
|
94 | | #if APR_HAS_LARGE_FILES && defined(HAVE_MMAP64) |
95 | | #define mmap mmap64 |
96 | | #elif APR_HAS_LARGE_FILES && SIZEOF_OFF_T == 4 |
97 | | /* LFS but no mmap64: check for overflow */ |
98 | | if ((apr_int64_t)offset + size > INT_MAX) |
99 | | return APR_EINVAL; |
100 | | #endif |
101 | |
|
102 | 0 | if (size == 0) |
103 | 0 | return APR_EINVAL; |
104 | | |
105 | 0 | if (file == NULL || file->filedes == -1 || file->buffered) |
106 | 0 | return APR_EBADF; |
107 | 0 | (*new) = (apr_mmap_t *)apr_pcalloc(cont, sizeof(apr_mmap_t)); |
108 | |
|
109 | | #ifdef BEOS |
110 | | /* XXX: mmap shouldn't really change the seek offset */ |
111 | | apr_file_seek(file, APR_SET, &offset); |
112 | | |
113 | | /* There seems to be some strange interactions that mean our area must |
114 | | * be set as READ & WRITE or writev will fail! Go figure... |
115 | | * So we ignore the value in flags and always ask for both READ and WRITE |
116 | | */ |
117 | | pages = (size + B_PAGE_SIZE -1) / B_PAGE_SIZE; |
118 | | aid = create_area("apr_mmap", &mm , B_ANY_ADDRESS, pages * B_PAGE_SIZE, |
119 | | B_NO_LOCK, B_WRITE_AREA|B_READ_AREA); |
120 | | |
121 | | if (aid < B_NO_ERROR) { |
122 | | /* we failed to get an area we can use... */ |
123 | | *new = NULL; |
124 | | return APR_ENOMEM; |
125 | | } |
126 | | |
127 | | if (aid >= B_NO_ERROR) |
128 | | read(file->filedes, mm, size); |
129 | | |
130 | | (*new)->area = aid; |
131 | | #else |
132 | |
|
133 | 0 | if (flag & APR_MMAP_WRITE) { |
134 | 0 | native_flags |= PROT_WRITE; |
135 | 0 | } |
136 | 0 | if (flag & APR_MMAP_READ) { |
137 | 0 | native_flags |= PROT_READ; |
138 | 0 | } |
139 | |
|
140 | 0 | #if defined(_SC_PAGESIZE) |
141 | 0 | if (psize == 0) { |
142 | 0 | psize = sysconf(_SC_PAGESIZE); |
143 | | /* the page size should be a power of two */ |
144 | 0 | assert(psize > 0 && (psize & (psize - 1)) == 0); |
145 | 0 | } |
146 | 0 | poffset = offset & (apr_off_t)(psize - 1); |
147 | 0 | (*new)->poffset = poffset; |
148 | 0 | #endif |
149 | |
|
150 | 0 | mm = mmap(NULL, size + poffset, |
151 | 0 | native_flags, MAP_SHARED, |
152 | 0 | file->filedes, offset - poffset); |
153 | |
|
154 | 0 | if (mm == (void *)-1) { |
155 | | /* we failed to get an mmap'd file... */ |
156 | 0 | *new = NULL; |
157 | 0 | return errno; |
158 | 0 | } |
159 | | |
160 | 0 | mm = (char *)mm + poffset; |
161 | 0 | #endif |
162 | |
|
163 | 0 | (*new)->mm = mm; |
164 | 0 | (*new)->size = size; |
165 | 0 | (*new)->cntxt = cont; |
166 | 0 | APR_RING_ELEM_INIT(*new, link); |
167 | | |
168 | | /* register the cleanup... */ |
169 | 0 | apr_pool_cleanup_register((*new)->cntxt, (void*)(*new), mmap_cleanup, |
170 | 0 | apr_pool_cleanup_null); |
171 | 0 | return APR_SUCCESS; |
172 | 0 | } |
173 | | |
174 | | APR_DECLARE(apr_status_t) apr_mmap_dup(apr_mmap_t **new_mmap, |
175 | | apr_mmap_t *old_mmap, |
176 | | apr_pool_t *p) |
177 | 0 | { |
178 | 0 | *new_mmap = (apr_mmap_t *)apr_pmemdup(p, old_mmap, sizeof(apr_mmap_t)); |
179 | 0 | (*new_mmap)->cntxt = p; |
180 | |
|
181 | 0 | APR_RING_INSERT_AFTER(old_mmap, *new_mmap, link); |
182 | |
|
183 | 0 | apr_pool_cleanup_register(p, *new_mmap, mmap_cleanup, |
184 | 0 | apr_pool_cleanup_null); |
185 | 0 | return APR_SUCCESS; |
186 | 0 | } |
187 | | |
188 | | APR_DECLARE(apr_status_t) apr_mmap_delete(apr_mmap_t *mm) |
189 | 0 | { |
190 | 0 | return apr_pool_cleanup_run(mm->cntxt, mm, mmap_cleanup); |
191 | 0 | } |
192 | | |
193 | | #endif |