90 lines
3.3 KiB
C
90 lines
3.3 KiB
C
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// Copyright (c) 2013 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// This file contains internal routines that are called by other files in
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// base/process/.
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#ifndef BASE_PROCESS_LINUX_INTERNAL_H_
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#define BASE_PROCESS_LINUX_INTERNAL_H_
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#include "base/files/file_path.h"
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namespace base {
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class Time;
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class TimeDelta;
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namespace internal {
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// "/proc"
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extern const char kProcDir[];
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// "stat"
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extern const char kStatFile[];
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// Returns a FilePath to "/proc/pid".
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base::FilePath GetProcPidDir(pid_t pid);
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// Take a /proc directory entry named |d_name|, and if it is the directory for
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// a process, convert it to a pid_t.
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// Returns 0 on failure.
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// e.g. /proc/self/ will return 0, whereas /proc/1234 will return 1234.
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pid_t ProcDirSlotToPid(const char* d_name);
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// Reads /proc/<pid>/stat into |buffer|. Returns true if the file can be read
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// and is non-empty.
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bool ReadProcStats(pid_t pid, std::string* buffer);
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// Takes |stats_data| and populates |proc_stats| with the values split by
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// spaces. Taking into account the 2nd field may, in itself, contain spaces.
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// Returns true if successful.
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bool ParseProcStats(const std::string& stats_data,
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std::vector<std::string>* proc_stats);
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// Fields from /proc/<pid>/stat, 0-based. See man 5 proc.
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// If the ordering ever changes, carefully review functions that use these
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// values.
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enum ProcStatsFields {
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VM_COMM = 1, // Filename of executable, without parentheses.
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VM_STATE = 2, // Letter indicating the state of the process.
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VM_PPID = 3, // PID of the parent.
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VM_PGRP = 4, // Process group id.
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VM_UTIME = 13, // Time scheduled in user mode in clock ticks.
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VM_STIME = 14, // Time scheduled in kernel mode in clock ticks.
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VM_NUMTHREADS = 19, // Number of threads.
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VM_STARTTIME = 21, // The time the process started in clock ticks.
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VM_VSIZE = 22, // Virtual memory size in bytes.
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VM_RSS = 23, // Resident Set Size in pages.
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};
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// Reads the |field_num|th field from |proc_stats|. Returns 0 on failure.
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// This version does not handle the first 3 values, since the first value is
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// simply |pid|, and the next two values are strings.
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int GetProcStatsFieldAsInt(const std::vector<std::string>& proc_stats,
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ProcStatsFields field_num);
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// Same as GetProcStatsFieldAsInt(), but for size_t values.
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size_t GetProcStatsFieldAsSizeT(const std::vector<std::string>& proc_stats,
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ProcStatsFields field_num);
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// Convenience wrapper around GetProcStatsFieldAsInt(), ParseProcStats() and
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// ReadProcStats(). See GetProcStatsFieldAsInt() for details.
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int ReadProcStatsAndGetFieldAsInt(pid_t pid,
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ProcStatsFields field_num);
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// Same as ReadProcStatsAndGetFieldAsInt() but for size_t values.
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size_t ReadProcStatsAndGetFieldAsSizeT(pid_t pid,
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ProcStatsFields field_num);
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// Returns the time that the OS started. Clock ticks are relative to this.
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Time GetBootTime();
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// Converts Linux clock ticks to a wall time delta.
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TimeDelta ClockTicksToTimeDelta(int clock_ticks);
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} // namespace internal
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} // namespace base
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#endif // BASE_PROCESS_LINUX_INTERNAL_H_
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