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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 "MapRecordReader.h"
#include <stdint.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <vector>
#include <android-base/strings.h>
#include "environment.h"
namespace simpleperf {
bool MapRecordReader::ReadKernelMaps() {
KernelMmap kernel_mmap;
std::vector<KernelMmap> module_mmaps;
GetKernelAndModuleMmaps(&kernel_mmap, &module_mmaps);
MmapRecord mmap_record(attr_, true, UINT_MAX, 0, kernel_mmap.start_addr, kernel_mmap.len, 0,
kernel_mmap.filepath, event_id_);
if (!callback_(&mmap_record)) {
return false;
}
for (const auto& module_mmap : module_mmaps) {
MmapRecord mmap_record(attr_, true, UINT_MAX, 0, module_mmap.start_addr, module_mmap.len, 0,
module_mmap.filepath, event_id_);
if (!callback_(&mmap_record)) {
return false;
}
}
return true;
}
bool MapRecordReader::ReadProcessMaps(pid_t pid, uint64_t timestamp) {
std::vector<pid_t> tids = GetThreadsInProcess(pid);
return ReadProcessMaps(pid, std::unordered_set<pid_t>(tids.begin(), tids.end()), timestamp);
}
bool MapRecordReader::ReadProcessMaps(pid_t pid, const std::unordered_set<pid_t>& tids,
uint64_t timestamp) {
// Dump mmap records.
std::vector<ThreadMmap> thread_mmaps;
if (!GetThreadMmapsInProcess(pid, &thread_mmaps)) {
// The process may exit before we get its info.
return true;
}
for (const auto& map : thread_mmaps) {
if (!(map.prot & PROT_EXEC) && !keep_non_executable_maps_) {
continue;
}
Mmap2Record record(attr_, false, pid, pid, map.start_addr, map.len, map.pgoff, map.prot,
map.name, event_id_, timestamp);
if (!callback_(&record)) {
return false;
}
}
// Dump process name.
std::string process_name = GetCompleteProcessName(pid);
if (!process_name.empty()) {
CommRecord record(attr_, pid, pid, process_name, event_id_, timestamp);
if (!callback_(&record)) {
return false;
}
}
// Dump thread info.
for (const auto& tid : tids) {
std::string name;
if (tid != pid && GetThreadName(tid, &name)) {
// If a thread name matches the suffix of its process name, probably the thread name
// is stripped by TASK_COMM_LEN.
if (android::base::EndsWith(process_name, name)) {
name = process_name;
}
CommRecord comm_record(attr_, pid, tid, name, event_id_, timestamp);
if (!callback_(&comm_record)) {
return false;
}
}
}
return true;
}
MapRecordThread::MapRecordThread(const MapRecordReader& map_record_reader)
: map_record_reader_(map_record_reader), fp_(nullptr, fclose) {
map_record_reader_.SetCallback([this](Record* r) { return WriteRecordToFile(r); });
tmpfile_ = ScopedTempFiles::CreateTempFile();
fp_.reset(fdopen(tmpfile_->release(), "r+"));
thread_ = std::thread([this]() { thread_result_ = RunThread(); });
}
MapRecordThread::~MapRecordThread() {
if (thread_.joinable()) {
early_stop_ = true;
thread_.join();
}
}
bool MapRecordThread::RunThread() {
if (!fp_) {
return false;
}
if (!map_record_reader_.ReadKernelMaps()) {
return false;
}
for (auto pid : GetAllProcesses()) {
if (early_stop_) {
return false;
}
if (!map_record_reader_.ReadProcessMaps(pid, 0)) {
return false;
}
}
return true;
}
bool MapRecordThread::WriteRecordToFile(Record* record) {
if (fwrite(record->Binary(), record->size(), 1, fp_.get()) != 1) {
PLOG(ERROR) << "failed to write map records to file";
return false;
}
return true;
}
bool MapRecordThread::Join() {
thread_.join();
if (!thread_result_) {
LOG(ERROR) << "map record thread failed";
}
return thread_result_;
}
bool MapRecordThread::ReadMapRecords(const std::function<bool(Record*)>& callback) {
off_t offset = ftello(fp_.get());
if (offset == -1) {
PLOG(ERROR) << "ftello() failed";
return false;
}
uint64_t file_size = static_cast<uint64_t>(offset);
if (fseek(fp_.get(), 0, SEEK_SET) != 0) {
PLOG(ERROR) << "fseek() failed";
return false;
}
uint64_t nread = 0;
std::vector<char> buffer(1024);
while (nread < file_size) {
if (fread(buffer.data(), Record::header_size(), 1, fp_.get()) != 1) {
PLOG(ERROR) << "fread() failed";
return false;
}
RecordHeader header;
if (!header.Parse(buffer.data())) {
return false;
}
if (buffer.size() < header.size) {
buffer.resize(header.size);
}
if (fread(buffer.data() + Record::header_size(), header.size - Record::header_size(), 1,
fp_.get()) != 1) {
PLOG(ERROR) << "fread() failed";
return false;
}
auto r = ReadRecordFromBuffer(map_record_reader_.Attr(), header.type, buffer.data(),
buffer.data() + header.size);
CHECK(r);
if (!callback(r.get())) {
return false;
}
nread += header.size;
}
return true;
}
} // namespace simpleperf
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