Repo created

TMessagesProj/jni/voip/webrtc/base/process/internal_linux.cc

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+// 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 <limits.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"
+
+// Not defined on AIX by default.
+#if defined(OS_AIX)
+#define NAME_MAX 255
+#endif
+
+namespace base {
+namespace internal {
+
+const char kProcDir[] = "/proc";
+
+const char kStatFile[] = "stat";
+
+FilePath GetProcPidDir(pid_t pid) {
+  return FilePath(kProcDir).Append(NumberToString(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 (const auto& i : other_stats)
+    proc_stats->push_back(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 (auto& i : key_value_pairs) {
+    output->insert(std::move(i));
+  }
+}
+
+int64_t 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_t 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_t ReadStatFileAndGetFieldAsInt64(const FilePath& stat_file,
+                                       ProcStatsFields field_num) {
+  std::string stats_data;
+  if (!ReadProcFile(stat_file, &stats_data))
+    return 0;
+  std::vector<std::string> proc_stats;
+  if (!ParseProcStats(stats_data, &proc_stats))
+    return 0;
+  return GetProcStatsFieldAsInt64(proc_stats, field_num);
+}
+
+int64_t ReadProcStatsAndGetFieldAsInt64(pid_t pid, ProcStatsFields field_num) {
+  FilePath stat_file = internal::GetProcPidDir(pid).Append(kStatFile);
+  return ReadStatFileAndGetFieldAsInt64(stat_file, field_num);
+}
+
+int64_t ReadProcSelfStatsAndGetFieldAsInt64(ProcStatsFields field_num) {
+  FilePath stat_file = FilePath(kProcDir).Append("self").Append(kStatFile);
+  return ReadStatFileAndGetFieldAsInt64(stat_file, 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 GetUserCpuTimeSinceBoot() {
+  FilePath path("/proc/stat");
+  std::string contents;
+  if (!ReadProcFile(path, &contents))
+    return TimeDelta();
+
+  ProcStatMap proc_stat;
+  ParseProcStat(contents, &proc_stat);
+  ProcStatMap::const_iterator cpu_it = proc_stat.find("cpu");
+  if (cpu_it == proc_stat.end())
+    return TimeDelta();
+
+  std::vector<std::string> cpu = SplitString(
+      cpu_it->second, kWhitespaceASCII, TRIM_WHITESPACE, SPLIT_WANT_NONEMPTY);
+
+  if (cpu.size() < 2 || cpu[0] != "cpu")
+    return TimeDelta();
+
+  uint64_t user;
+  uint64_t nice;
+  if (!StringToUint64(cpu[0], &user) || !StringToUint64(cpu[1], &nice))
+    return TimeDelta();
+
+  return ClockTicksToTimeDelta(user + nice);
+}
+
+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