1/*
2 * Copyright (C) 2016 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#include "AshmemMapper.h"
18
19#include <sys/mman.h>
20
21#include "AshmemMemory.h"
22
23namespace android {
24namespace hidl {
25namespace memory {
26namespace V1_0 {
27namespace implementation {
28
29// Methods from ::android::hidl::memory::V1_0::IMapper follow.
30Return<sp<IMemory>> AshmemMapper::mapMemory(const hidl_memory& mem) {
31    if (mem.handle()->numFds == 0) {
32        return nullptr;
33    }
34
35    int fd = mem.handle()->data[0];
36    void* data = mmap(0, mem.size(), PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
37    if (data == MAP_FAILED) {
38        // mmap never maps at address zero without MAP_FIXED, so we can avoid
39        // exposing clients to MAP_FAILED.
40        return nullptr;
41    }
42
43    return new AshmemMemory(mem, data);
44}
45
46}  // namespace implementation
47}  // namespace V1_0
48}  // namespace memory
49}  // namespace hidl
50}  // namespace android
51