/base/process/internal_linux.cc
C++ | 188 lines | 138 code | 28 blank | 22 comment | 21 complexity | 46f38af769d21184064e8c236929b345 MD5 | raw file
- // Copyright (c) 2012 The Chromium Authors. All rights reserved.
- // Use of this source code is governed by a BSD-style license that can be
- // found in the LICENSE file.
- #include "base/process/internal_linux.h"
- #include <unistd.h>
- #include <map>
- #include <string>
- #include <vector>
- #include "base/files/file_util.h"
- #include "base/logging.h"
- #include "base/strings/string_number_conversions.h"
- #include "base/strings/string_split.h"
- #include "base/strings/string_util.h"
- #include "base/threading/thread_restrictions.h"
- #include "base/time/time.h"
- namespace base {
- namespace internal {
- const char kProcDir[] = "/proc";
- const char kStatFile[] = "stat";
- FilePath GetProcPidDir(pid_t pid) {
- return FilePath(kProcDir).Append(IntToString(pid));
- }
- pid_t ProcDirSlotToPid(const char* d_name) {
- int i;
- for (i = 0; i < NAME_MAX && d_name[i]; ++i) {
- if (!IsAsciiDigit(d_name[i])) {
- return 0;
- }
- }
- if (i == NAME_MAX)
- return 0;
- // Read the process's command line.
- pid_t pid;
- std::string pid_string(d_name);
- if (!StringToInt(pid_string, &pid)) {
- NOTREACHED();
- return 0;
- }
- return pid;
- }
- bool ReadProcFile(const FilePath& file, std::string* buffer) {
- buffer->clear();
- // Synchronously reading files in /proc is safe.
- ThreadRestrictions::ScopedAllowIO allow_io;
- if (!ReadFileToString(file, buffer)) {
- DLOG(WARNING) << "Failed to read " << file.MaybeAsASCII();
- return false;
- }
- return !buffer->empty();
- }
- bool ReadProcStats(pid_t pid, std::string* buffer) {
- FilePath stat_file = internal::GetProcPidDir(pid).Append(kStatFile);
- return ReadProcFile(stat_file, buffer);
- }
- bool ParseProcStats(const std::string& stats_data,
- std::vector<std::string>* proc_stats) {
- // |stats_data| may be empty if the process disappeared somehow.
- // e.g. http://crbug.com/145811
- if (stats_data.empty())
- return false;
- // The stat file is formatted as:
- // pid (process name) data1 data2 .... dataN
- // Look for the closing paren by scanning backwards, to avoid being fooled by
- // processes with ')' in the name.
- size_t open_parens_idx = stats_data.find(" (");
- size_t close_parens_idx = stats_data.rfind(") ");
- if (open_parens_idx == std::string::npos ||
- close_parens_idx == std::string::npos ||
- open_parens_idx > close_parens_idx) {
- DLOG(WARNING) << "Failed to find matched parens in '" << stats_data << "'";
- NOTREACHED();
- return false;
- }
- open_parens_idx++;
- proc_stats->clear();
- // PID.
- proc_stats->push_back(stats_data.substr(0, open_parens_idx));
- // Process name without parentheses.
- proc_stats->push_back(
- stats_data.substr(open_parens_idx + 1,
- close_parens_idx - (open_parens_idx + 1)));
- // Split the rest.
- std::vector<std::string> other_stats = SplitString(
- stats_data.substr(close_parens_idx + 2), " ",
- base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL);
- for (size_t i = 0; i < other_stats.size(); ++i)
- proc_stats->push_back(other_stats[i]);
- return true;
- }
- typedef std::map<std::string, std::string> ProcStatMap;
- void ParseProcStat(const std::string& contents, ProcStatMap* output) {
- StringPairs key_value_pairs;
- SplitStringIntoKeyValuePairs(contents, ' ', '\n', &key_value_pairs);
- for (size_t i = 0; i < key_value_pairs.size(); ++i) {
- output->insert(key_value_pairs[i]);
- }
- }
- int64 GetProcStatsFieldAsInt64(const std::vector<std::string>& proc_stats,
- ProcStatsFields field_num) {
- DCHECK_GE(field_num, VM_PPID);
- CHECK_LT(static_cast<size_t>(field_num), proc_stats.size());
- int64 value;
- return StringToInt64(proc_stats[field_num], &value) ? value : 0;
- }
- size_t GetProcStatsFieldAsSizeT(const std::vector<std::string>& proc_stats,
- ProcStatsFields field_num) {
- DCHECK_GE(field_num, VM_PPID);
- CHECK_LT(static_cast<size_t>(field_num), proc_stats.size());
- size_t value;
- return StringToSizeT(proc_stats[field_num], &value) ? value : 0;
- }
- int64 ReadProcStatsAndGetFieldAsInt64(pid_t pid, ProcStatsFields field_num) {
- std::string stats_data;
- if (!ReadProcStats(pid, &stats_data))
- return 0;
- std::vector<std::string> proc_stats;
- if (!ParseProcStats(stats_data, &proc_stats))
- return 0;
- return GetProcStatsFieldAsInt64(proc_stats, field_num);
- }
- size_t ReadProcStatsAndGetFieldAsSizeT(pid_t pid,
- ProcStatsFields field_num) {
- std::string stats_data;
- if (!ReadProcStats(pid, &stats_data))
- return 0;
- std::vector<std::string> proc_stats;
- if (!ParseProcStats(stats_data, &proc_stats))
- return 0;
- return GetProcStatsFieldAsSizeT(proc_stats, field_num);
- }
- Time GetBootTime() {
- FilePath path("/proc/stat");
- std::string contents;
- if (!ReadProcFile(path, &contents))
- return Time();
- ProcStatMap proc_stat;
- ParseProcStat(contents, &proc_stat);
- ProcStatMap::const_iterator btime_it = proc_stat.find("btime");
- if (btime_it == proc_stat.end())
- return Time();
- int btime;
- if (!StringToInt(btime_it->second, &btime))
- return Time();
- return Time::FromTimeT(btime);
- }
- TimeDelta ClockTicksToTimeDelta(int clock_ticks) {
- // This queries the /proc-specific scaling factor which is
- // conceptually the system hertz. To dump this value on another
- // system, try
- // od -t dL /proc/self/auxv
- // and look for the number after 17 in the output; mine is
- // 0000040 17 100 3 134512692
- // which means the answer is 100.
- // It may be the case that this value is always 100.
- static const int kHertz = sysconf(_SC_CLK_TCK);
- return TimeDelta::FromMicroseconds(
- Time::kMicrosecondsPerSecond * clock_ticks / kHertz);
- }
- } // namespace internal
- } // namespace base