142 lines
4.0 KiB
C++
142 lines
4.0 KiB
C++
// Copyright 2017 The Crashpad Authors. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "util/linux/proc_stat_reader.h"
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#include <stdio.h>
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#include <time.h>
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#include <unistd.h>
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#include "base/cxx17_backports.h"
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#include "base/files/file_path.h"
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#include "base/logging.h"
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#include "util/file/file_io.h"
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#include "util/misc/lexing.h"
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#include "util/misc/time.h"
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namespace crashpad {
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namespace {
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long GetClockTicksPerSecond() {
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long clock_ticks_per_s = sysconf(_SC_CLK_TCK);
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if (clock_ticks_per_s <= 0) {
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PLOG(ERROR) << "sysconf";
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}
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return clock_ticks_per_s;
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}
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} // namespace
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ProcStatReader::ProcStatReader()
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: contents_(), third_column_position_(0), initialized_() {}
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ProcStatReader::~ProcStatReader() {}
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bool ProcStatReader::Initialize(PtraceConnection* connection, pid_t tid) {
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INITIALIZATION_STATE_SET_INITIALIZING(initialized_);
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char path[32];
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snprintf(path, base::size(path), "/proc/%d/stat", tid);
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if (!connection->ReadFileContents(base::FilePath(path), &contents_)) {
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return false;
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}
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// The first column is process ID and the second column is the executable name
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// in parentheses. This class only cares about columns after the second, so
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// find the start of the third here and save it for later.
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// The executable name may have parentheses itself, so find the end of the
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// second column by working backwards to find the last closing parens.
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size_t stat_pos = contents_.rfind(')');
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if (stat_pos == std::string::npos) {
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LOG(ERROR) << "format error";
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return false;
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}
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third_column_position_ = contents_.find(' ', stat_pos);
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if (third_column_position_ == std::string::npos ||
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++third_column_position_ >= contents_.size()) {
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LOG(ERROR) << "format error";
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return false;
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}
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INITIALIZATION_STATE_SET_VALID(initialized_);
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return true;
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}
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bool ProcStatReader::UserCPUTime(timeval* user_time) const {
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INITIALIZATION_STATE_DCHECK_VALID(initialized_);
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return ReadTimeAtIndex(13, user_time);
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}
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bool ProcStatReader::SystemCPUTime(timeval* system_time) const {
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INITIALIZATION_STATE_DCHECK_VALID(initialized_);
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return ReadTimeAtIndex(14, system_time);
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}
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bool ProcStatReader::StartTime(const timeval& boot_time,
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timeval* start_time) const {
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INITIALIZATION_STATE_DCHECK_VALID(initialized_);
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timeval time_after_boot;
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if (!ReadTimeAtIndex(21, &time_after_boot)) {
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return false;
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}
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timeradd(&boot_time, &time_after_boot, start_time);
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return true;
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}
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bool ProcStatReader::FindColumn(int col_index, const char** column) const {
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size_t position = third_column_position_;
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for (int index = 2; index < col_index; ++index) {
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position = contents_.find(' ', position);
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if (position == std::string::npos) {
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break;
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}
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++position;
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}
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if (position >= contents_.size()) {
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LOG(ERROR) << "format error";
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return false;
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}
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*column = &contents_[position];
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return true;
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}
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bool ProcStatReader::ReadTimeAtIndex(int index, timeval* time_val) const {
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const char* ticks_ptr;
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if (!FindColumn(index, &ticks_ptr)) {
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return false;
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}
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uint64_t ticks;
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if (!AdvancePastNumber<uint64_t>(&ticks_ptr, &ticks)) {
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LOG(ERROR) << "format error";
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return false;
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}
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static long clock_ticks_per_s = GetClockTicksPerSecond();
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if (clock_ticks_per_s <= 0) {
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return false;
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}
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time_val->tv_sec = ticks / clock_ticks_per_s;
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time_val->tv_usec = (ticks % clock_ticks_per_s) *
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(static_cast<long>(1E6) / clock_ticks_per_s);
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return true;
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}
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} // namespace crashpad
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