SharedMemoryParcelable.cpp revision 71f35bb687476694882a617ba4a810a0bb56fe23 
1/*
2 * Copyright 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#define LOG_TAG "AAudio"
18//#define LOG_NDEBUG 0
19#include <utils/Log.h>
20
21#include <stdint.h>
22#include <stdio.h>
23
24#include <sys/mman.h>
25#include <aaudio/AAudio.h>
26
27#include <binder/Parcelable.h>
28#include <utility/AAudioUtilities.h>
29
30#include "binding/SharedMemoryParcelable.h"
31
32using android::NO_ERROR;
33using android::status_t;
34using android::Parcel;
35using android::Parcelable;
36
37using namespace aaudio;
38
39SharedMemoryParcelable::SharedMemoryParcelable() {}
40SharedMemoryParcelable::~SharedMemoryParcelable() {};
41
42void SharedMemoryParcelable::setup(int fd, int32_t sizeInBytes) {
43    mFd = fd;
44    mSizeInBytes = sizeInBytes;
45
46}
47
48status_t SharedMemoryParcelable::writeToParcel(Parcel* parcel) const {
49    status_t status = parcel->writeInt32(mSizeInBytes);
50    if (status != NO_ERROR) return status;
51    if (mSizeInBytes > 0) {
52        status = parcel->writeDupFileDescriptor(mFd);
53        ALOGE_IF(status != NO_ERROR, "SharedMemoryParcelable writeDupFileDescriptor failed : %d", status);
54    }
55    return status;
56}
57
58status_t SharedMemoryParcelable::readFromParcel(const Parcel* parcel) {
59    status_t status = parcel->readInt32(&mSizeInBytes);
60    if (status != NO_ERROR) {
61        return status;
62    }
63    if (mSizeInBytes > 0) {
64        int originalFD = parcel->readFileDescriptor();
65        mFd = fcntl(originalFD, F_DUPFD_CLOEXEC, 0);
66        if (mFd == -1) {
67            status = -errno;
68            ALOGE("SharedMemoryParcelable readFileDescriptor fcntl() failed : %d", status);
69        }
70    }
71    return status;
72}
73
74aaudio_result_t SharedMemoryParcelable::close() {
75    if (mResolvedAddress != nullptr) {
76        int err = munmap(mResolvedAddress, mSizeInBytes);
77        if (err < 0) {
78            ALOGE("SharedMemoryParcelable::close() munmap() failed %d", err);
79            return AAudioConvert_androidToAAudioResult(err);
80        }
81        mResolvedAddress = nullptr;
82    }
83    if (mFd != -1) {
84        ::close(mFd);
85        mFd = -1;
86    }
87    return AAUDIO_OK;
88}
89
90aaudio_result_t SharedMemoryParcelable::resolve(int32_t offsetInBytes, int32_t sizeInBytes,
91                                              void **regionAddressPtr) {
92
93    if (offsetInBytes < 0) {
94        ALOGE("SharedMemoryParcelable illegal offsetInBytes = %d", offsetInBytes);
95        return AAUDIO_ERROR_OUT_OF_RANGE;
96    } else if ((offsetInBytes + sizeInBytes) > mSizeInBytes) {
97        ALOGE("SharedMemoryParcelable out of range, offsetInBytes = %d, "
98              "sizeInBytes = %d, mSizeInBytes = %d",
99              offsetInBytes, sizeInBytes, mSizeInBytes);
100        return AAUDIO_ERROR_OUT_OF_RANGE;
101    }
102    if (mResolvedAddress == nullptr) {
103        mResolvedAddress = (uint8_t *) mmap(0, mSizeInBytes, PROT_READ|PROT_WRITE,
104                                          MAP_SHARED, mFd, 0);
105        if (mResolvedAddress == nullptr) {
106            ALOGE("SharedMemoryParcelable mmap failed for fd = %d", mFd);
107            return AAUDIO_ERROR_INTERNAL;
108        }
109    }
110    *regionAddressPtr = mResolvedAddress + offsetInBytes;
111    ALOGV("SharedMemoryParcelable mResolvedAddress = %p", mResolvedAddress);
112    ALOGV("SharedMemoryParcelable offset by %d, *regionAddressPtr = %p",
113          offsetInBytes, *regionAddressPtr);
114    return AAUDIO_OK;
115}
116
117int32_t SharedMemoryParcelable::getSizeInBytes() {
118    return mSizeInBytes;
119}
120
121aaudio_result_t SharedMemoryParcelable::validate() {
122    if (mSizeInBytes < 0 || mSizeInBytes >= MAX_MMAP_SIZE_BYTES) {
123        ALOGE("SharedMemoryParcelable invalid mSizeInBytes = %d", mSizeInBytes);
124        return AAUDIO_ERROR_OUT_OF_RANGE;
125    }
126    if (mSizeInBytes > 0) {
127        if (mFd == -1) {
128            ALOGE("SharedMemoryParcelable uninitialized mFd = %d", mFd);
129            return AAUDIO_ERROR_INTERNAL;
130        }
131    }
132    return AAUDIO_OK;
133}
134
135void SharedMemoryParcelable::dump() {
136    ALOGD("SharedMemoryParcelable mFd = %d", mFd);
137    ALOGD("SharedMemoryParcelable mSizeInBytes = %d", mSizeInBytes);
138    ALOGD("SharedMemoryParcelable mResolvedAddress = %p", mResolvedAddress);
139}
140