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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;
}
}
static const std::regex kContextLine("^context (\\w+)$");
bool isDesiredContext = false;
std::string line;
std::smatch match;
while (getline(ifs, line)) {
if (std::regex_search(line, match, kContextLine)) {
isDesiredContext = match.str(1) == contextName;
continue;
}
if (!isDesiredContext) {
continue;
}
eachLine(line);
}
return OK;
}
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 (std::regex_search(line, match, kReferencePrefix)) {
const std::string& ptrString = "0x" + match.str(2); // use number after c
uint64_t ptr;
if (!::android::base::ParseUint(ptrString.c_str(), &ptr)) {
// Should not reach here, but just be tolerant.
return;
}
const std::string proc = " proc ";
auto pos = line.rfind(proc);
if (pos != std::string::npos) {
for (const std::string& pidStr : base::Split(line.substr(pos + proc.size()), " ")) {
int32_t pid;
if (!::android::base::ParseInt(pidStr, &pid)) {
return;
}
pidInfo->refPids[ptr].push_back(pid);
}
}
return;
}
if (std::regex_search(line, match, kThreadPrefix)) {
// "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 = match.str(1) != "1";
// "0" is a thread that has called into binder
// "1" is looper thread
// "2" is main looper thread
bool isBinderThread = match.str(2) != "0";
if (!isBinderThread) {
return;
}
if (isInUse) {
pidInfo->threadUsage++;
}
pidInfo->threadCount++;
return;
}
return;
});
return ret;
}
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 (std::regex_search(line, match, kNodeNumber)) {
const std::string& descString = match.str(1);
int32_t desc;
if (!::android::base::ParseInt(descString.c_str(), &desc)) {
LOG(ERROR) << "Failed to parse desc int: " << descString;
return;
}
if (handle != desc) {
return;
}
const std::string& nodeString = match.str(2);
if (!::android::base::ParseInt(nodeString.c_str(), &node)) {
LOG(ERROR) << "Failed to parse node int: " << nodeString;
return;
}
return;
}
return;
});
if (ret != OK) {
return ret;
}
static const std::regex kClients("^\\s+node\\s+(\\d+).*proc\\s+([\\d+\\s*]*)");
ret = scanBinderContext(servicePid, contextStr, [&](const std::string& line) {
if (std::regex_search(line, match, kClients)) {
const std::string nodeString = match.str(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;
}
const std::string clients = match.str(2);
for (const std::string& pidStr : base::Split(clients, " ")) {
int32_t pid;
if (!::android::base::ParseInt(pidStr, &pid)) {
return;
}
pids->push_back(pid);
}
return;
}
return;
});
return ret;
}
} // namespace android
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