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 <unistd.h> 12 13 #include "base/files/file_path.h" 14 15 namespace base { 16 17 class Time; 18 class TimeDelta; 19 20 namespace internal { 21 22 // "/proc" 23 extern const char kProcDir[]; 24 25 // "stat" 26 extern const char kStatFile[]; 27 28 // Returns a FilePath to "/proc/pid". 29 base::FilePath GetProcPidDir(pid_t pid); 30 31 // Take a /proc directory entry named |d_name|, and if it is the directory for 32 // a process, convert it to a pid_t. 33 // Returns 0 on failure. 34 // e.g. /proc/self/ will return 0, whereas /proc/1234 will return 1234. 35 pid_t ProcDirSlotToPid(const char* d_name); 36 37 // Reads /proc/<pid>/stat into |buffer|. Returns true if the file can be read 38 // and is non-empty. 39 bool ReadProcStats(pid_t pid, std::string* buffer); 40 41 // Takes |stats_data| and populates |proc_stats| with the values split by 42 // spaces. Taking into account the 2nd field may, in itself, contain spaces. 43 // Returns true if successful. 44 bool ParseProcStats(const std::string& stats_data, 45 std::vector<std::string>* proc_stats); 46 47 // Fields from /proc/<pid>/stat, 0-based. See man 5 proc. 48 // If the ordering ever changes, carefully review functions that use these 49 // values. 50 enum ProcStatsFields { 51 VM_COMM = 1, // Filename of executable, without parentheses. 52 VM_STATE = 2, // Letter indicating the state of the process. 53 VM_PPID = 3, // PID of the parent. 54 VM_PGRP = 4, // Process group id. 55 VM_UTIME = 13, // Time scheduled in user mode in clock ticks. 56 VM_STIME = 14, // Time scheduled in kernel mode in clock ticks. 57 VM_NUMTHREADS = 19, // Number of threads. 58 VM_STARTTIME = 21, // The time the process started in clock ticks. 59 VM_VSIZE = 22, // Virtual memory size in bytes. 60 VM_RSS = 23, // Resident Set Size in pages. 61 }; 62 63 // Reads the |field_num|th field from |proc_stats|. Returns 0 on failure. 64 // This version does not handle the first 3 values, since the first value is 65 // simply |pid|, and the next two values are strings. 66 int GetProcStatsFieldAsInt(const std::vector<std::string>& proc_stats, 67 ProcStatsFields field_num); 68 69 // Same as GetProcStatsFieldAsInt(), but for size_t values. 70 size_t GetProcStatsFieldAsSizeT(const std::vector<std::string>& proc_stats, 71 ProcStatsFields field_num); 72 73 // Convenience wrapper around GetProcStatsFieldAsInt(), ParseProcStats() and 74 // ReadProcStats(). See GetProcStatsFieldAsInt() for details. 75 int ReadProcStatsAndGetFieldAsInt(pid_t pid, 76 ProcStatsFields field_num); 77 78 // Same as ReadProcStatsAndGetFieldAsInt() but for size_t values. 79 size_t ReadProcStatsAndGetFieldAsSizeT(pid_t pid, 80 ProcStatsFields field_num); 81 82 // Returns the time that the OS started. Clock ticks are relative to this. 83 Time GetBootTime(); 84 85 // Converts Linux clock ticks to a wall time delta. 86 TimeDelta ClockTicksToTimeDelta(int clock_ticks); 87 88 } // namespace internal 89 } // namespace base 90 91 #endif // BASE_PROCESS_LINUX_INTERNAL_H_ 92