1 /*
2 * Copyright (c) 2022 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 "buffer_handle_utils.h"
24 #include "distributed_hardware_log.h"
25
26 namespace OHOS {
27 namespace DistributedHardware {
28 #ifdef DCAMERA_MMAP_RESERVE
DCameraMemoryMap(const BufferHandle * buffer)29 void* DCameraMemoryMap(const BufferHandle *buffer)
30 {
31 if (buffer == nullptr) {
32 DHLOGE("mmap the buffer handle is NULL");
33 return nullptr;
34 }
35 void* virAddr = nullptr;
36 if (buffer->reserveFds <= 0) {
37 virAddr = mmap(NULL, buffer->size, PROT_READ | PROT_WRITE, MAP_SHARED, buffer->fd, 0);
38 } else {
39 virAddr = mmap(NULL, buffer->size, PROT_READ | PROT_WRITE, MAP_SHARED, buffer->reserve[0], 0);
40 }
41 if (virAddr == MAP_FAILED) {
42 DHLOGE("mmap failed errno %s, fd : %d", strerror(errno), buffer->fd);
43 return nullptr;
44 }
45 return virAddr;
46 }
47 #else
48 void* DCameraMemoryMap(const BufferHandle *buffer)
49 {
50 if (buffer == nullptr) {
51 DHLOGE("mmap the buffer handle is NULL");
52 return nullptr;
53 }
54
55 void* virAddr = mmap(NULL, buffer->size, PROT_READ | PROT_WRITE, MAP_SHARED, buffer->fd, 0);
56 if (virAddr == MAP_FAILED) {
57 DHLOGE("mmap failed errno %s, fd : %d", strerror(errno), buffer->fd);
58 return nullptr;
59 }
60 return virAddr;
61 }
62 #endif
63
DCameraMemoryUnmap(BufferHandle * buffer)64 void DCameraMemoryUnmap(BufferHandle *buffer)
65 {
66 if (buffer == nullptr) {
67 DHLOGE("unmmap the buffer handle is NULL");
68 return;
69 }
70 if (buffer->virAddr != nullptr) {
71 int ret = munmap(buffer->virAddr, buffer->size);
72 if (ret != 0) {
73 DHLOGE("munmap failed err: %s", strerror(errno));
74 }
75 }
76 buffer->virAddr = nullptr;
77 FreeBufferHandle(buffer);
78 }
79 } // namespace DistributedHardware
80 } // namespace OHOS