| /* |
| * Copyright (C) 2020 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #include <android-base/logging.h> |
| #include <android-base/parseint.h> |
| #include <android-base/strings.h> |
| #include <binder/Binder.h> |
| #include <sys/types.h> |
| #include <fstream> |
| #include <regex> |
| |
| #include <binderdebug/BinderDebug.h> |
| |
| namespace android { |
| |
| static std::string contextToString(BinderDebugContext context) { |
| switch (context) { |
| case BinderDebugContext::BINDER: |
| return "binder"; |
| case BinderDebugContext::HWBINDER: |
| return "hwbinder"; |
| case BinderDebugContext::VNDBINDER: |
| return "vndbinder"; |
| default: |
| return std::string(); |
| } |
| } |
| |
| static status_t scanBinderContext(pid_t pid, const std::string& contextName, |
| std::function<void(const std::string&)> eachLine) { |
| std::ifstream ifs("/dev/binderfs/binder_logs/proc/" + std::to_string(pid)); |
| if (!ifs.is_open()) { |
| ifs.open("/d/binder/proc/" + std::to_string(pid)); |
| if (!ifs.is_open()) { |
| return -errno; |
| } |
| } |
| |
| bool isDesiredContext = false; |
| std::string line; |
| while (getline(ifs, line)) { |
| if (base::StartsWith(line, "context")) { |
| isDesiredContext = base::Split(line, " ").back() == contextName; |
| continue; |
| } |
| if (!isDesiredContext) { |
| continue; |
| } |
| eachLine(line); |
| } |
| return OK; |
| } |
| |
| // Examples of what we are looking at: |
| // node 66730: u00007590061890e0 c0000759036130950 pri 0:120 hs 1 hw 1 ls 0 lw 0 is 2 iw 2 tr 1 proc 2300 1790 |
| // thread 2999: l 00 need_return 1 tr 0 |
| status_t getBinderPidInfo(BinderDebugContext context, pid_t pid, BinderPidInfo* pidInfo) { |
| std::smatch match; |
| static const std::regex kReferencePrefix("^\\s*node \\d+:\\s+u([0-9a-f]+)\\s+c([0-9a-f]+)\\s+"); |
| static const std::regex kThreadPrefix("^\\s*thread \\d+:\\s+l\\s+(\\d)(\\d)"); |
| std::string contextStr = contextToString(context); |
| status_t ret = scanBinderContext(pid, contextStr, [&](const std::string& line) { |
| if (base::StartsWith(line, " node")) { |
| std::vector<std::string> splitString = base::Tokenize(line, " "); |
| bool pids = false; |
| uint64_t ptr = 0; |
| for (const auto& token : splitString) { |
| if (base::StartsWith(token, "u")) { |
| const std::string ptrString = "0x" + token.substr(1); |
| if (!::android::base::ParseUint(ptrString.c_str(), &ptr)) { |
| LOG(ERROR) << "Failed to parse pointer: " << ptrString; |
| return; |
| } |
| } else { |
| // The last numbers in the line after "proc" are all client PIDs |
| if (token == "proc") { |
| pids = true; |
| } else if (pids) { |
| int32_t pid; |
| if (!::android::base::ParseInt(token, &pid)) { |
| LOG(ERROR) << "Failed to parse pid int: " << token; |
| return; |
| } |
| if (ptr == 0) { |
| LOG(ERROR) << "We failed to parse the pointer, so we can't add the refPids"; |
| return; |
| } |
| pidInfo->refPids[ptr].push_back(pid); |
| } |
| } |
| } |
| } else if (base::StartsWith(line, " thread")) { |
| auto pos = line.find("l "); |
| if (pos != std::string::npos) { |
| // "1" is waiting in binder driver |
| // "2" is poll. It's impossible to tell if these are in use. |
| // and HIDL default code doesn't use it. |
| bool isInUse = line.at(pos + 2) != '1'; |
| // "0" is a thread that has called into binder |
| // "1" is looper thread |
| // "2" is main looper thread |
| bool isBinderThread = line.at(pos + 3) != '0'; |
| if (!isBinderThread) { |
| return; |
| } |
| if (isInUse) { |
| pidInfo->threadUsage++; |
| } |
| |
| pidInfo->threadCount++; |
| } |
| } |
| }); |
| return ret; |
| } |
| |
| // Examples of what we are looking at: |
| // ref 52493: desc 910 node 52492 s 1 w 1 d 0000000000000000 |
| // node 29413: u00007803fc982e80 c000078042c982210 pri 0:139 hs 1 hw 1 ls 0 lw 0 is 2 iw 2 tr 1 proc 488 683 |
| status_t getBinderClientPids(BinderDebugContext context, pid_t pid, pid_t servicePid, |
| int32_t handle, std::vector<pid_t>* pids) { |
| std::smatch match; |
| static const std::regex kNodeNumber("^\\s+ref \\d+:\\s+desc\\s+(\\d+)\\s+node\\s+(\\d+).*"); |
| std::string contextStr = contextToString(context); |
| int32_t node; |
| status_t ret = scanBinderContext(pid, contextStr, [&](const std::string& line) { |
| if (!base::StartsWith(line, " ref")) return; |
| |
| std::vector<std::string> splitString = base::Tokenize(line, " "); |
| if (splitString.size() < 12) { |
| LOG(ERROR) << "Failed to parse binder_logs ref entry. Expecting size greater than 11, but got: " << splitString.size(); |
| return; |
| } |
| int32_t desc; |
| if (!::android::base::ParseInt(splitString[3].c_str(), &desc)) { |
| LOG(ERROR) << "Failed to parse desc int: " << splitString[3]; |
| return; |
| } |
| if (handle != desc) { |
| return; |
| } |
| if (!::android::base::ParseInt(splitString[5].c_str(), &node)) { |
| LOG(ERROR) << "Failed to parse node int: " << splitString[5]; |
| return; |
| } |
| LOG(INFO) << "Parsed the node: " << node; |
| }); |
| if (ret != OK) { |
| return ret; |
| } |
| |
| ret = scanBinderContext(servicePid, contextStr, [&](const std::string& line) { |
| if (!base::StartsWith(line, " node")) return; |
| |
| std::vector<std::string> splitString = base::Tokenize(line, " "); |
| if (splitString.size() < 21) { |
| LOG(ERROR) << "Failed to parse binder_logs node entry. Expecting size greater than 20, but got: " << splitString.size(); |
| return; |
| } |
| |
| // remove the colon |
| const std::string nodeString = splitString[1].substr(0, splitString[1].size() - 1); |
| int32_t matchedNode; |
| if (!::android::base::ParseInt(nodeString.c_str(), &matchedNode)) { |
| LOG(ERROR) << "Failed to parse node int: " << nodeString; |
| return; |
| } |
| |
| if (node != matchedNode) { |
| return; |
| } |
| bool pidsSection = false; |
| for (const auto& token : splitString) { |
| if (token == "proc") { |
| pidsSection = true; |
| } else if (pidsSection == true) { |
| int32_t pid; |
| if (!::android::base::ParseInt(token.c_str(), &pid)) { |
| LOG(ERROR) << "Failed to parse PID int: " << token; |
| return; |
| } |
| pids->push_back(pid); |
| } |
| } |
| }); |
| return ret; |
| } |
| |
| status_t getBinderTransactions(pid_t pid, std::string& transactionsOutput) { |
| std::ifstream ifs("/dev/binderfs/binder_logs/transactions"); |
| if (!ifs.is_open()) { |
| ifs.open("/d/binder/transactions"); |
| if (!ifs.is_open()) { |
| LOG(ERROR) << "Could not open /dev/binderfs/binder_logs/transactions. " |
| << "Likely a permissions issue. errno: " << errno; |
| return -errno; |
| } |
| } |
| |
| std::string line; |
| while (getline(ifs, line)) { |
| // The section for this pid ends with another "proc <pid>" for another |
| // process. There is only one entry per pid so we can stop looking after |
| // we've grabbed the whole section |
| if (base::StartsWith(line, "proc " + std::to_string(pid))) { |
| do { |
| transactionsOutput += line + '\n'; |
| } while (getline(ifs, line) && !base::StartsWith(line, "proc ")); |
| return OK; |
| } |
| } |
| |
| return NAME_NOT_FOUND; |
| } |
| |
| } // namespace android |
