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
registerWriter(const sp<IMemory> & shared,size_t size,const char * name)29 void MediaLogService::registerWriter(const sp<IMemory>& shared, size_t size, const char *name)
30 {
31 if (IPCThreadState::self()->getCallingUid() != AID_MEDIA || shared == 0 ||
32 size < kMinSize || size > kMaxSize || name == NULL ||
33 shared->size() < NBLog::Timeline::sharedSize(size)) {
34 return;
35 }
36 sp<NBLog::Reader> reader(new NBLog::Reader(size, shared));
37 NamedReader namedReader(reader, name);
38 Mutex::Autolock _l(mLock);
39 mNamedReaders.add(namedReader);
40 }
41
unregisterWriter(const sp<IMemory> & shared)42 void MediaLogService::unregisterWriter(const sp<IMemory>& shared)
43 {
44 if (IPCThreadState::self()->getCallingUid() != AID_MEDIA || shared == 0) {
45 return;
46 }
47 Mutex::Autolock _l(mLock);
48 for (size_t i = 0; i < mNamedReaders.size(); ) {
49 if (mNamedReaders[i].reader()->isIMemory(shared)) {
50 mNamedReaders.removeAt(i);
51 } else {
52 i++;
53 }
54 }
55 }
56
dump(int fd,const Vector<String16> & args __unused)57 status_t MediaLogService::dump(int fd, const Vector<String16>& args __unused)
58 {
59 // FIXME merge with similar but not identical code at services/audioflinger/ServiceUtilities.cpp
60 static const String16 sDump("android.permission.DUMP");
61 if (!(IPCThreadState::self()->getCallingUid() == AID_MEDIA ||
62 PermissionCache::checkCallingPermission(sDump))) {
63 dprintf(fd, "Permission Denial: can't dump media.log from pid=%d, uid=%d\n",
64 IPCThreadState::self()->getCallingPid(),
65 IPCThreadState::self()->getCallingUid());
66 return NO_ERROR;
67 }
68
69 Vector<NamedReader> namedReaders;
70 {
71 Mutex::Autolock _l(mLock);
72 namedReaders = mNamedReaders;
73 }
74 for (size_t i = 0; i < namedReaders.size(); i++) {
75 const NamedReader& namedReader = namedReaders[i];
76 if (fd >= 0) {
77 dprintf(fd, "\n%s:\n", namedReader.name());
78 } else {
79 ALOGI("%s:", namedReader.name());
80 }
81 namedReader.reader()->dump(fd, 0 /*indent*/);
82 }
83 return NO_ERROR;
84 }
85
onTransact(uint32_t code,const Parcel & data,Parcel * reply,uint32_t flags)86 status_t MediaLogService::onTransact(uint32_t code, const Parcel& data, Parcel* reply,
87 uint32_t flags)
88 {
89 return BnMediaLogService::onTransact(code, data, reply, flags);
90 }
91
92 } // namespace android
93