1 // Copyright (c) 2013 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 // This file contains internal routines that are called by other files in 6 // base/process/. 7 8 #ifndef BASE_PROCESS_LINUX_INTERNAL_H_ 9 #define BASE_PROCESS_LINUX_INTERNAL_H_ 10 11 #include "base/files/file_path.h" 12 13 namespace base { 14 15 class Time; 16 class TimeDelta; 17 18 namespace internal { 19 20 // "/proc" 21 extern const char kProcDir[]; 22 23 // "stat" 24 extern const char kStatFile[]; 25 26 // Returns a FilePath to "/proc/pid". 27 base::FilePath GetProcPidDir(pid_t pid); 28 29 // Take a /proc directory entry named |d_name|, and if it is the directory for 30 // a process, convert it to a pid_t. 31 // Returns 0 on failure. 32 // e.g. /proc/self/ will return 0, whereas /proc/1234 will return 1234. 33 pid_t ProcDirSlotToPid(const char* d_name); 34 35 // Reads /proc/<pid>/stat into |buffer|. Returns true if the file can be read 36 // and is non-empty. 37 bool ReadProcStats(pid_t pid, std::string* buffer); 38 39 // Takes |stats_data| and populates |proc_stats| with the values split by 40 // spaces. Taking into account the 2nd field may, in itself, contain spaces. 41 // Returns true if successful. 42 bool ParseProcStats(const std::string& stats_data, 43 std::vector<std::string>* proc_stats); 44 45 // Fields from /proc/<pid>/stat, 0-based. See man 5 proc. 46 // If the ordering ever changes, carefully review functions that use these 47 // values. 48 enum ProcStatsFields { 49 VM_COMM = 1, // Filename of executable, without parentheses. 50 VM_STATE = 2, // Letter indicating the state of the process. 51 VM_PPID = 3, // PID of the parent. 52 VM_PGRP = 4, // Process group id. 53 VM_UTIME = 13, // Time scheduled in user mode in clock ticks. 54 VM_STIME = 14, // Time scheduled in kernel mode in clock ticks. 55 VM_NUMTHREADS = 19, // Number of threads. 56 VM_STARTTIME = 21, // The time the process started in clock ticks. 57 VM_VSIZE = 22, // Virtual memory size in bytes. 58 VM_RSS = 23, // Resident Set Size in pages. 59 }; 60 61 // Reads the |field_num|th field from |proc_stats|. Returns 0 on failure. 62 // This version does not handle the first 3 values, since the first value is 63 // simply |pid|, and the next two values are strings. 64 int GetProcStatsFieldAsInt(const std::vector<std::string>& proc_stats, 65 ProcStatsFields field_num); 66 67 // Same as GetProcStatsFieldAsInt(), but for size_t values. 68 size_t GetProcStatsFieldAsSizeT(const std::vector<std::string>& proc_stats, 69 ProcStatsFields field_num); 70 71 // Convenience wrapper around GetProcStatsFieldAsInt(), ParseProcStats() and 72 // ReadProcStats(). See GetProcStatsFieldAsInt() for details. 73 int ReadProcStatsAndGetFieldAsInt(pid_t pid, 74 ProcStatsFields field_num); 75 76 // Same as ReadProcStatsAndGetFieldAsInt() but for size_t values. 77 size_t ReadProcStatsAndGetFieldAsSizeT(pid_t pid, 78 ProcStatsFields field_num); 79 80 // Returns the time that the OS started. Clock ticks are relative to this. 81 Time GetBootTime(); 82 83 // Converts Linux clock ticks to a wall time delta. 84 TimeDelta ClockTicksToTimeDelta(int clock_ticks); 85 86 } // namespace internal 87 } // namespace base 88 89 #endif // BASE_PROCESS_LINUX_INTERNAL_H_ 90
