SharedMemoryParcelable.cpp revision 942bdc0aebc88dc8b12c0e7742ec0003bbb8b80f 
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        mOriginalFd = parcel->readFileDescriptor();
66        ALOGV("SharedMemoryParcelable::readFromParcel() LEAK? mOriginalFd = %d\n", mOriginalFd);
67        mFd = fcntl(mOriginalFd, F_DUPFD_CLOEXEC, 0);
68        ALOGV("SharedMemoryParcelable::readFromParcel() LEAK? mFd = %d\n", mFd);
69        if (mFd == -1) {
70            status = -errno;
71            ALOGE("SharedMemoryParcelable readFromParcel fcntl() failed : %d", status);
72        }
73    }
74    return status;
75}
76
77aaudio_result_t SharedMemoryParcelable::close() {
78    if (mResolvedAddress != MMAP_UNRESOLVED_ADDRESS) {
79        int err = munmap(mResolvedAddress, mSizeInBytes);
80        if (err < 0) {
81            ALOGE("SharedMemoryParcelable::close() munmap() failed %d", err);
82            return AAudioConvert_androidToAAudioResult(err);
83        }
84        mResolvedAddress = MMAP_UNRESOLVED_ADDRESS;
85    }
86    if (mFd != -1) {
87        ALOGV("SharedMemoryParcelable::close() LEAK? mFd = %d\n", mFd);
88        ::close(mFd);
89        mFd = -1;
90    }
91    if (mOriginalFd != -1) {
92        ALOGV("SharedMemoryParcelable::close() LEAK? mOriginalFd = %d\n", mOriginalFd);
93        ::close(mOriginalFd);
94        mOriginalFd = -1;
95    }
96    return AAUDIO_OK;
97}
98
99aaudio_result_t SharedMemoryParcelable::resolve(int32_t offsetInBytes, int32_t sizeInBytes,
100                                              void **regionAddressPtr) {
101
102    if (offsetInBytes < 0) {
103        ALOGE("SharedMemoryParcelable illegal offsetInBytes = %d", offsetInBytes);
104        return AAUDIO_ERROR_OUT_OF_RANGE;
105    } else if ((offsetInBytes + sizeInBytes) > mSizeInBytes) {
106        ALOGE("SharedMemoryParcelable out of range, offsetInBytes = %d, "
107              "sizeInBytes = %d, mSizeInBytes = %d",
108              offsetInBytes, sizeInBytes, mSizeInBytes);
109        return AAUDIO_ERROR_OUT_OF_RANGE;
110    }
111    if (mResolvedAddress == MMAP_UNRESOLVED_ADDRESS) {
112        mResolvedAddress = (uint8_t *) mmap(0, mSizeInBytes, PROT_READ|PROT_WRITE,
113                                          MAP_SHARED, mFd, 0);
114        if (mResolvedAddress == MMAP_UNRESOLVED_ADDRESS) {
115            ALOGE("SharedMemoryParcelable mmap failed for fd = %d, errno = %s",
116                  mFd, strerror(errno));
117            return AAUDIO_ERROR_INTERNAL;
118        }
119    }
120    *regionAddressPtr = mResolvedAddress + offsetInBytes;
121    ALOGV("SharedMemoryParcelable mResolvedAddress = %p", mResolvedAddress);
122    ALOGV("SharedMemoryParcelable offset by %d, *regionAddressPtr = %p",
123          offsetInBytes, *regionAddressPtr);
124    return AAUDIO_OK;
125}
126
127int32_t SharedMemoryParcelable::getSizeInBytes() {
128    return mSizeInBytes;
129}
130
131aaudio_result_t SharedMemoryParcelable::validate() {
132    if (mSizeInBytes < 0 || mSizeInBytes >= MAX_MMAP_SIZE_BYTES) {
133        ALOGE("SharedMemoryParcelable invalid mSizeInBytes = %d", mSizeInBytes);
134        return AAUDIO_ERROR_OUT_OF_RANGE;
135    }
136    if (mSizeInBytes > 0) {
137        if (mFd == -1) {
138            ALOGE("SharedMemoryParcelable uninitialized mFd = %d", mFd);
139            return AAUDIO_ERROR_INTERNAL;
140        }
141    }
142    return AAUDIO_OK;
143}
144
145void SharedMemoryParcelable::dump() {
146    ALOGD("SharedMemoryParcelable mFd = %d", mFd);
147    ALOGD("SharedMemoryParcelable mSizeInBytes = %d", mSizeInBytes);
148    ALOGD("SharedMemoryParcelable mResolvedAddress = %p", mResolvedAddress);
149}
150