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      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 
     32 using android::NO_ERROR;
     33 using android::status_t;
     34 using android::Parcel;
     35 using android::Parcelable;
     36 
     37 using namespace aaudio;
     38 
     39 SharedMemoryParcelable::SharedMemoryParcelable() {}
     40 SharedMemoryParcelable::~SharedMemoryParcelable() {};
     41 
     42 void SharedMemoryParcelable::setup(int fd, int32_t sizeInBytes) {
     43     mFd = fd;
     44     mSizeInBytes = sizeInBytes;
     45 
     46 }
     47 
     48 status_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",
     54                  status);
     55     }
     56     return status;
     57 }
     58 
     59 status_t SharedMemoryParcelable::readFromParcel(const Parcel* parcel) {
     60     status_t status = parcel->readInt32(&mSizeInBytes);
     61     if (status != NO_ERROR) {
     62         return status;
     63     }
     64     if (mSizeInBytes > 0) {
     65         // Keep the original FD until you are done with the mFd.
     66         // If you close it in here then it will prevent mFd from working.
     67         mOriginalFd = parcel->readFileDescriptor();
     68         ALOGV("SharedMemoryParcelable::readFromParcel() LEAK? mOriginalFd = %d\n", mOriginalFd);
     69         mFd = fcntl(mOriginalFd, F_DUPFD_CLOEXEC, 0);
     70         ALOGV("SharedMemoryParcelable::readFromParcel() LEAK? mFd = %d\n", mFd);
     71         if (mFd == -1) {
     72             status = -errno;
     73             ALOGE("SharedMemoryParcelable readFromParcel fcntl() failed : %d", status);
     74         }
     75     }
     76     return status;
     77 }
     78 
     79 aaudio_result_t SharedMemoryParcelable::close() {
     80     if (mResolvedAddress != MMAP_UNRESOLVED_ADDRESS) {
     81         int err = munmap(mResolvedAddress, mSizeInBytes);
     82         if (err < 0) {
     83             ALOGE("SharedMemoryParcelable::close() munmap() failed %d", err);
     84             return AAudioConvert_androidToAAudioResult(err);
     85         }
     86         mResolvedAddress = MMAP_UNRESOLVED_ADDRESS;
     87     }
     88     if (mFd != -1) {
     89         ALOGV("SharedMemoryParcelable::close() LEAK? mFd = %d\n", mFd);
     90         ::close(mFd);
     91         mFd = -1;
     92     }
     93     if (mOriginalFd != -1) {
     94         ALOGV("SharedMemoryParcelable::close() LEAK? mOriginalFd = %d\n", mOriginalFd);
     95         ::close(mOriginalFd);
     96         mOriginalFd = -1;
     97     }
     98     return AAUDIO_OK;
     99 }
    100 
    101 aaudio_result_t SharedMemoryParcelable::resolve(int32_t offsetInBytes, int32_t sizeInBytes,
    102                                               void **regionAddressPtr) {
    103 
    104     if (offsetInBytes < 0) {
    105         ALOGE("SharedMemoryParcelable illegal offsetInBytes = %d", offsetInBytes);
    106         return AAUDIO_ERROR_OUT_OF_RANGE;
    107     } else if ((offsetInBytes + sizeInBytes) > mSizeInBytes) {
    108         ALOGE("SharedMemoryParcelable out of range, offsetInBytes = %d, "
    109               "sizeInBytes = %d, mSizeInBytes = %d",
    110               offsetInBytes, sizeInBytes, mSizeInBytes);
    111         return AAUDIO_ERROR_OUT_OF_RANGE;
    112     }
    113     if (mResolvedAddress == MMAP_UNRESOLVED_ADDRESS) {
    114         mResolvedAddress = (uint8_t *) mmap(0, mSizeInBytes, PROT_READ|PROT_WRITE,
    115                                           MAP_SHARED, mFd, 0);
    116         if (mResolvedAddress == MMAP_UNRESOLVED_ADDRESS) {
    117             ALOGE("SharedMemoryParcelable mmap failed for fd = %d, errno = %s",
    118                   mFd, strerror(errno));
    119             return AAUDIO_ERROR_INTERNAL;
    120         }
    121     }
    122     *regionAddressPtr = mResolvedAddress + offsetInBytes;
    123     ALOGV("SharedMemoryParcelable mResolvedAddress = %p", mResolvedAddress);
    124     ALOGV("SharedMemoryParcelable offset by %d, *regionAddressPtr = %p",
    125           offsetInBytes, *regionAddressPtr);
    126     return AAUDIO_OK;
    127 }
    128 
    129 int32_t SharedMemoryParcelable::getSizeInBytes() {
    130     return mSizeInBytes;
    131 }
    132 
    133 aaudio_result_t SharedMemoryParcelable::validate() {
    134     if (mSizeInBytes < 0 || mSizeInBytes >= MAX_MMAP_SIZE_BYTES) {
    135         ALOGE("SharedMemoryParcelable invalid mSizeInBytes = %d", mSizeInBytes);
    136         return AAUDIO_ERROR_OUT_OF_RANGE;
    137     }
    138     if (mSizeInBytes > 0) {
    139         if (mFd == -1) {
    140             ALOGE("SharedMemoryParcelable uninitialized mFd = %d", mFd);
    141             return AAUDIO_ERROR_INTERNAL;
    142         }
    143     }
    144     return AAUDIO_OK;
    145 }
    146 
    147 void SharedMemoryParcelable::dump() {
    148     ALOGD("SharedMemoryParcelable mFd = %d", mFd);
    149     ALOGD("SharedMemoryParcelable mSizeInBytes = %d", mSizeInBytes);
    150     ALOGD("SharedMemoryParcelable mResolvedAddress = %p", mResolvedAddress);
    151 }
    152