1 /*
2 * Copyright (C) 2021 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * 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 #define LOG_TAG "LargeParcelable"
18
19 #include "MappedFile.h"
20
21 #include <utils/Log.h>
22
23 #include <assert.h>
24 #include <errno.h>
25 #include <sys/mman.h>
26
27 namespace android {
28 namespace automotive {
29 namespace car_binder_lib {
30
MappedFile(int memoryFd,int32_t fileSize,bool writtable)31 MappedFile::MappedFile(int memoryFd, int32_t fileSize, bool writtable) {
32 mAddr = mmap(/*addr=*/NULL, fileSize, (writtable ? PROT_WRITE : PROT_READ), MAP_SHARED,
33 memoryFd, /*offset=*/0);
34 if (mAddr == MAP_FAILED) {
35 ALOGE("mmap failed: %s", std::strerror(errno));
36 mErrno = errno;
37 }
38 mReadOnly = !writtable;
39 mSize = fileSize;
40 }
41
sync() const42 void MappedFile::sync() const {
43 msync(mAddr, mSize, MS_SYNC);
44 }
45
~MappedFile()46 MappedFile::~MappedFile() {
47 if (isValid()) {
48 munmap(mAddr, mSize);
49 }
50 }
51
52 } // namespace car_binder_lib
53 } // namespace automotive
54 } // namespace android
55