101 lines
2.6 KiB
C++
101 lines
2.6 KiB
C++
/*
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* Copyright (C) 2021 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#define LOG_TAG "LargeParcelable"
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#include "SharedMemory.h"
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#include "MappedFile.h"
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#include <android-base/unique_fd.h>
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#include <cutils/ashmem.h>
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#include <utils/Errors.h>
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#include <utils/Log.h>
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#include <assert.h>
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#include <errno.h>
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#include <sys/mman.h>
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#include <memory>
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namespace android {
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namespace automotive {
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namespace car_binder_lib {
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using ::android::OK;
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using ::android::status_t;
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using ::android::base::borrowed_fd;
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using ::android::base::unique_fd;
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SharedMemory::SharedMemory(unique_fd fd) : mBorrowedFd(-1), mOwned(true) {
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int intFd = fd.get();
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if (!ashmem_valid(intFd)) {
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ALOGE("%s", "the FD is not valid");
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mErrno = errno;
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return;
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}
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int size = ashmem_get_size_region(intFd);
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if (size < 0) {
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ALOGE("ashmem_get_size_region failed, error: %s", std::strerror(errno));
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mErrno = errno;
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return;
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}
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mOwnedFd = std::move(fd);
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mSize = size;
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}
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SharedMemory::SharedMemory(borrowed_fd fd) : mBorrowedFd(-1), mOwned(false) {
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int intFd = fd.get();
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if (!ashmem_valid(intFd)) {
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ALOGE("%s", "the FD is not valid");
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return;
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}
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int size = ashmem_get_size_region(intFd);
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if (size < 0) {
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ALOGE("ashmem_get_size_region failed, error: %s", std::strerror(errno));
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mErrno = errno;
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return;
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}
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mBorrowedFd = std::move(fd);
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mSize = size;
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}
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SharedMemory::SharedMemory(size_t size) : mBorrowedFd(-1), mOwned(true) {
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int fd = ashmem_create_region("SharedMemory", size);
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if (fd < 0) {
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ALOGE("ASharedMemory_create failed, error: %s", std::strerror(errno));
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mErrno = errno;
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return;
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}
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mOwnedFd.reset(fd);
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mSize = size;
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}
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status_t SharedMemory::lock() {
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int result = ashmem_set_prot_region(getFd(), PROT_READ);
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if (result != 0) {
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ALOGE("ASharedMemory_setProt failed, error: %s", std::strerror(errno));
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mErrno = errno;
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return -result;
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}
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mLocked = true;
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return OK;
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}
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} // namespace car_binder_lib
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} // namespace automotive
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} // namespace android
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