MediaLogService.cpp revision 6f1c1918d0dfece10f728711b055441e4d135c73 
1/*
2 * Copyright (C) 2013 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 "MediaLog"
18//#define LOG_NDEBUG 0
19
20#include <sys/mman.h>
21#include <utils/Log.h>
22#include <media/nbaio/NBLog.h>
23#include <private/android_filesystem_config.h>
24#include "MediaLogService.h"
25
26namespace android {
27
28void MediaLogService::registerWriter(const sp<IMemory>& shared, size_t size, const char *name)
29{
30    if (IPCThreadState::self()->getCallingUid() != AID_MEDIA || shared == 0 ||
31            size < kMinSize || size > kMaxSize || name == NULL ||
32            shared->size() < NBLog::Timeline::sharedSize(size)) {
33        return;
34    }
35    sp<NBLog::Reader> reader(new NBLog::Reader(size, shared));
36    NamedReader namedReader(reader, name);
37    Mutex::Autolock _l(mLock);
38    mNamedReaders.add(namedReader);
39}
40
41void MediaLogService::unregisterWriter(const sp<IMemory>& shared)
42{
43    if (IPCThreadState::self()->getCallingUid() != AID_MEDIA || shared == 0) {
44        return;
45    }
46    Mutex::Autolock _l(mLock);
47    for (size_t i = 0; i < mNamedReaders.size(); ) {
48        if (mNamedReaders[i].reader()->isIMemory(shared)) {
49            mNamedReaders.removeAt(i);
50        } else {
51            i++;
52        }
53    }
54}
55
56status_t MediaLogService::dump(int fd, const Vector<String16>& args)
57{
58    Vector<NamedReader> namedReaders;
59    {
60        Mutex::Autolock _l(mLock);
61        namedReaders = mNamedReaders;
62    }
63    for (size_t i = 0; i < namedReaders.size(); i++) {
64        const NamedReader& namedReader = namedReaders[i];
65        if (fd >= 0) {
66            fdprintf(fd, "\n%s:\n", namedReader.name());
67        } else {
68            ALOGI("%s:", namedReader.name());
69        }
70        namedReader.reader()->dump(fd, 0 /*indent*/);
71    }
72    return NO_ERROR;
73}
74
75status_t MediaLogService::onTransact(uint32_t code, const Parcel& data, Parcel* reply,
76        uint32_t flags)
77{
78    return BnMediaLogService::onTransact(code, data, reply, flags);
79}
80
81}   // namespace android
82