SharedMemoryParcelable.cpp revision 87c9f646a94259d7c321c3b3d5947fa1778f5ac2 
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",
54                 status);
55    }
56    return status;
57}
58
59status_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
79aaudio_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
101aaudio_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
129int32_t SharedMemoryParcelable::getSizeInBytes() {
130    return mSizeInBytes;
131}
132
133aaudio_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
147void SharedMemoryParcelable::dump() {
148    ALOGD("SharedMemoryParcelable mFd = %d", mFd);
149    ALOGD("SharedMemoryParcelable mSizeInBytes = %d", mSizeInBytes);
150    ALOGD("SharedMemoryParcelable mResolvedAddress = %p", mResolvedAddress);
151}
152