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 <binder/PermissionCache.h>
23 #include <media/nbaio/NBLog.h>
24 #include <private/android_filesystem_config.h>
25 #include "MediaLogService.h"
26
27 namespace android {
28
29 // static const char kDeadlockedString[] = "MediaLogService may be deadlocked\n";
MediaLogService()30 MediaLogService::MediaLogService() :
31 BnMediaLogService(),
32 mMergerShared((NBLog::Shared*) malloc(NBLog::Timeline::sharedSize(kMergeBufferSize))),
33 mMerger(mMergerShared, kMergeBufferSize),
34 mMergeReader(mMergerShared, kMergeBufferSize, mMerger),
35 mMergeThread(new NBLog::MergeThread(mMerger))
36 {
37 mMergeThread->run("MergeThread");
38 }
39
~MediaLogService()40 MediaLogService::~MediaLogService()
41 {
42 mMergeThread->requestExit();
43 mMergeThread->setTimeoutUs(0);
44 mMergeThread->join();
45 free(mMergerShared);
46 }
47
registerWriter(const sp<IMemory> & shared,size_t size,const char * name)48 void MediaLogService::registerWriter(const sp<IMemory>& shared, size_t size, const char *name)
49 {
50 if (IPCThreadState::self()->getCallingUid() != AID_AUDIOSERVER || shared == 0 ||
51 size < kMinSize || size > kMaxSize || name == NULL ||
52 shared->size() < NBLog::Timeline::sharedSize(size)) {
53 return;
54 }
55 sp<NBLog::Reader> reader(new NBLog::Reader(shared, size));
56 NBLog::NamedReader namedReader(reader, name);
57 Mutex::Autolock _l(mLock);
58 mNamedReaders.add(namedReader);
59 mMerger.addReader(namedReader);
60 }
61
unregisterWriter(const sp<IMemory> & shared)62 void MediaLogService::unregisterWriter(const sp<IMemory>& shared)
63 {
64 if (IPCThreadState::self()->getCallingUid() != AID_AUDIOSERVER || shared == 0) {
65 return;
66 }
67 Mutex::Autolock _l(mLock);
68 for (size_t i = 0; i < mNamedReaders.size(); ) {
69 if (mNamedReaders[i].reader()->isIMemory(shared)) {
70 mNamedReaders.removeAt(i);
71 } else {
72 i++;
73 }
74 }
75 }
76
dumpTryLock(Mutex & mutex)77 bool MediaLogService::dumpTryLock(Mutex& mutex)
78 {
79 bool locked = false;
80 for (int i = 0; i < kDumpLockRetries; ++i) {
81 if (mutex.tryLock() == NO_ERROR) {
82 locked = true;
83 break;
84 }
85 usleep(kDumpLockSleepUs);
86 }
87 return locked;
88 }
89
dump(int fd,const Vector<String16> & args __unused)90 status_t MediaLogService::dump(int fd, const Vector<String16>& args __unused)
91 {
92 // FIXME merge with similar but not identical code at services/audioflinger/ServiceUtilities.cpp
93 static const String16 sDump("android.permission.DUMP");
94 if (!(IPCThreadState::self()->getCallingUid() == AID_AUDIOSERVER ||
95 PermissionCache::checkCallingPermission(sDump))) {
96 dprintf(fd, "Permission Denial: can't dump media.log from pid=%d, uid=%d\n",
97 IPCThreadState::self()->getCallingPid(),
98 IPCThreadState::self()->getCallingUid());
99 return NO_ERROR;
100 }
101
102 #if 0
103 Vector<NBLog::NamedReader> namedReaders;
104 {
105 bool locked = dumpTryLock(mLock);
106
107 // failed to lock - MediaLogService is probably deadlocked
108 if (!locked) {
109 String8 result(kDeadlockedString);
110 if (fd >= 0) {
111 write(fd, result.string(), result.size());
112 } else {
113 ALOGW("%s:", result.string());
114 }
115 return NO_ERROR;
116 }
117 // namedReaders = mNamedReaders;
118 // for (size_t i = 0; i < namedReaders.size(); i++) {
119 // const NBLog::NamedReader& namedReader = namedReaders[i];
120 // if (fd >= 0) {
121 // dprintf(fd, "\n%s:\n", namedReader.name());
122 // } else {
123 // ALOGI("%s:", namedReader.name());
124 // }
125 // namedReader.reader()->dump(fd, 0 /*indent*/);
126 // }
127
128 mLock.unlock();
129 }
130 #endif
131 // FIXME request merge to make sure log is up to date
132 mMergeReader.dump(fd);
133 return NO_ERROR;
134 }
135
onTransact(uint32_t code,const Parcel & data,Parcel * reply,uint32_t flags)136 status_t MediaLogService::onTransact(uint32_t code, const Parcel& data, Parcel* reply,
137 uint32_t flags)
138 {
139 return BnMediaLogService::onTransact(code, data, reply, flags);
140 }
141
requestMergeWakeup()142 void MediaLogService::requestMergeWakeup() {
143 mMergeThread->wakeup();
144 }
145
146 } // namespace android
147