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 "apr_general.h"
18#include "apr_shm.h"
19#include "apr_errno.h"
20#include "apr_lib.h"
21#include "apr_strings.h"
22#include "apr_portable.h"
23
24struct apr_shm_t {
25    apr_pool_t *pool;
26    void *memblock;
27};
28
29APR_DECLARE(apr_status_t) apr_shm_create(apr_shm_t **m,
30                                         apr_size_t reqsize,
31                                         const char *filename,
32                                         apr_pool_t *pool)
33{
34    int rc;
35    apr_shm_t *newm = (apr_shm_t *)apr_palloc(pool, sizeof(apr_shm_t));
36    char *name = NULL;
37    ULONG flags = PAG_COMMIT|PAG_READ|PAG_WRITE;
38
39    newm->pool = pool;
40
41    if (filename) {
42        name = apr_pstrcat(pool, "\\SHAREMEM\\", filename, NULL);
43    }
44
45    if (name == NULL) {
46        flags |= OBJ_GETTABLE;
47    }
48
49    rc = DosAllocSharedMem(&(newm->memblock), name, reqsize, flags);
50
51    if (rc) {
52        return APR_OS2_STATUS(rc);
53    }
54
55    *m = newm;
56    return APR_SUCCESS;
57}
58
59APR_DECLARE(apr_status_t) apr_shm_destroy(apr_shm_t *m)
60{
61    DosFreeMem(m->memblock);
62    return APR_SUCCESS;
63}
64
65APR_DECLARE(apr_status_t) apr_shm_remove(const char *filename,
66                                         apr_pool_t *pool)
67{
68    return APR_ENOTIMPL;
69}
70
71APR_DECLARE(apr_status_t) apr_shm_attach(apr_shm_t **m,
72                                         const char *filename,
73                                         apr_pool_t *pool)
74{
75    int rc;
76    apr_shm_t *newm = (apr_shm_t *)apr_palloc(pool, sizeof(apr_shm_t));
77    char *name = NULL;
78    ULONG flags = PAG_READ|PAG_WRITE;
79
80    newm->pool = pool;
81    name = apr_pstrcat(pool, "\\SHAREMEM\\", filename, NULL);
82
83    rc = DosGetNamedSharedMem(&(newm->memblock), name, flags);
84
85    if (rc) {
86        return APR_FROM_OS_ERROR(rc);
87    }
88
89    *m = newm;
90    return APR_SUCCESS;
91}
92
93APR_DECLARE(apr_status_t) apr_shm_detach(apr_shm_t *m)
94{
95    int rc = 0;
96
97    if (m->memblock) {
98        rc = DosFreeMem(m->memblock);
99    }
100
101    return APR_FROM_OS_ERROR(rc);
102}
103
104APR_DECLARE(void *) apr_shm_baseaddr_get(const apr_shm_t *m)
105{
106    return m->memblock;
107}
108
109APR_DECLARE(apr_size_t) apr_shm_size_get(const apr_shm_t *m)
110{
111    ULONG flags, size = 0x1000000;
112    DosQueryMem(m->memblock, &size, &flags);
113    return size;
114}
115
116APR_POOL_IMPLEMENT_ACCESSOR(shm)
117
118APR_DECLARE(apr_status_t) apr_os_shm_get(apr_os_shm_t *osshm,
119                                         apr_shm_t *shm)
120{
121    *osshm = shm->memblock;
122    return APR_SUCCESS;
123}
124
125APR_DECLARE(apr_status_t) apr_os_shm_put(apr_shm_t **m,
126                                         apr_os_shm_t *osshm,
127                                         apr_pool_t *pool)
128{
129    int rc;
130    apr_shm_t *newm = (apr_shm_t *)apr_palloc(pool, sizeof(apr_shm_t));
131    ULONG flags = PAG_COMMIT|PAG_READ|PAG_WRITE;
132
133    newm->pool = pool;
134
135    rc = DosGetSharedMem(&(newm->memblock), flags);
136
137    if (rc) {
138        return APR_FROM_OS_ERROR(rc);
139    }
140
141    *m = newm;
142    return APR_SUCCESS;
143}
144
145