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      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 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 
     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 
     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 
     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