1 /*
2 * Copyright (c) 2022-2023 Huawei Device Co., Ltd.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at
6 *
7 * http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
14 */
15
16 #include "dcamera_buffer_handle.h"
17
18 #include <cerrno>
19 #include <cstddef>
20 #include <string>
21 #include <sys/mman.h>
22
23 #include "distributed_hardware_log.h"
24
25 namespace OHOS {
26 namespace DistributedHardware {
27 #ifdef DCAMERA_MMAP_RESERVE
DCameraMemoryMap(const BufferHandle * buffer)28 void* DCameraMemoryMap(const BufferHandle *buffer)
29 {
30 if (buffer == nullptr) {
31 DHLOGE("mmap the buffer handle is NULL");
32 return nullptr;
33 }
34 void* virAddr = nullptr;
35 if (buffer->reserveFds <= 0) {
36 virAddr = mmap(NULL, buffer->size, PROT_READ | PROT_WRITE, MAP_SHARED, buffer->fd, 0);
37 } else {
38 virAddr = mmap(NULL, buffer->size, PROT_READ | PROT_WRITE, MAP_SHARED, buffer->reserve[0], 0);
39 }
40 if (virAddr == MAP_FAILED) {
41 DHLOGE("mmap failed errno %s, fd : %d", strerror(errno), buffer->fd);
42 return nullptr;
43 }
44 return virAddr;
45 }
46 #else
47 void* DCameraMemoryMap(const BufferHandle *buffer)
48 {
49 if (buffer == nullptr) {
50 DHLOGE("mmap the buffer handle is NULL");
51 return nullptr;
52 }
53
54 void* virAddr = mmap(NULL, buffer->size, PROT_READ | PROT_WRITE, MAP_SHARED, buffer->fd, 0);
55 if (virAddr == MAP_FAILED) {
56 DHLOGE("mmap failed errno %s, fd : %d", strerror(errno), buffer->fd);
57 return nullptr;
58 }
59 return virAddr;
60 }
61 #endif
62
DCameraMemoryUnmap(BufferHandle * buffer)63 void DCameraMemoryUnmap(BufferHandle *buffer)
64 {
65 if (buffer == nullptr) {
66 DHLOGE("unmmap the buffer handle is NULL");
67 return;
68 }
69 if (buffer->virAddr != nullptr) {
70 int ret = munmap(buffer->virAddr, buffer->size);
71 if (ret != 0) {
72 DHLOGE("munmap failed err: %s", strerror(errno));
73 }
74 }
75 buffer->virAddr = nullptr;
76 }
77 } // namespace DistributedHardware
78 } // namespace OHOS