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/*
* 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;
}
} // namespace android
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