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_INTERNAL_LINUX_H_ 9 #define BASE_PROCESS_INTERNAL_LINUX_H_ 10 11 #include <stddef.h> 12 #include <stdint.h> 13 #include <unistd.h> 14 15 #include "base/files/file_path.h" 16 17 namespace base { 18 19 class Time; 20 class TimeDelta; 21 22 namespace internal { 23 24 // "/proc" 25 extern const char kProcDir[]; 26 27 // "stat" 28 extern const char kStatFile[]; 29 30 // Returns a FilePath to "/proc/pid". 31 base::FilePath GetProcPidDir(pid_t pid); 32 33 // Take a /proc directory entry named |d_name|, and if it is the directory for 34 // a process, convert it to a pid_t. 35 // Returns 0 on failure. 36 // e.g. /proc/self/ will return 0, whereas /proc/1234 will return 1234. 37 pid_t ProcDirSlotToPid(const char* d_name); 38 39 // Reads /proc/<pid>/stat into |buffer|. Returns true if the file can be read 40 // and is non-empty. 41 bool ReadProcStats(pid_t pid, std::string* buffer); 42 43 // Takes |stats_data| and populates |proc_stats| with the values split by 44 // spaces. Taking into account the 2nd field may, in itself, contain spaces. 45 // Returns true if successful. 46 bool ParseProcStats(const std::string& stats_data, 47 std::vector<std::string>* proc_stats); 48 49 // Fields from /proc/<pid>/stat, 0-based. See man 5 proc. 50 // If the ordering ever changes, carefully review functions that use these 51 // values. 52 enum ProcStatsFields { 53 VM_COMM = 1, // Filename of executable, without parentheses. 54 VM_STATE = 2, // Letter indicating the state of the process. 55 VM_PPID = 3, // PID of the parent. 56 VM_PGRP = 4, // Process group id. 57 VM_UTIME = 13, // Time scheduled in user mode in clock ticks. 58 VM_STIME = 14, // Time scheduled in kernel mode in clock ticks. 59 VM_NUMTHREADS = 19, // Number of threads. 60 VM_STARTTIME = 21, // The time the process started in clock ticks. 61 VM_VSIZE = 22, // Virtual memory size in bytes. 62 VM_RSS = 23, // Resident Set Size in pages. 63 }; 64 65 // Reads the |field_num|th field from |proc_stats|. Returns 0 on failure. 66 // This version does not handle the first 3 values, since the first value is 67 // simply |pid|, and the next two values are strings. 68 int64_t GetProcStatsFieldAsInt64(const std::vector<std::string>& proc_stats, 69 ProcStatsFields field_num); 70 71 // Same as GetProcStatsFieldAsInt64(), but for size_t values. 72 size_t GetProcStatsFieldAsSizeT(const std::vector<std::string>& proc_stats, 73 ProcStatsFields field_num); 74 75 // Convenience wrapper around GetProcStatsFieldAsInt64(), ParseProcStats() and 76 // ReadProcStats(). See GetProcStatsFieldAsInt64() for details. 77 int64_t ReadProcStatsAndGetFieldAsInt64(pid_t pid, ProcStatsFields field_num); 78 79 // Same as ReadProcStatsAndGetFieldAsInt64() but for size_t values. 80 size_t ReadProcStatsAndGetFieldAsSizeT(pid_t pid, 81 ProcStatsFields field_num); 82 83 // Returns the time that the OS started. Clock ticks are relative to this. 84 Time GetBootTime(); 85 86 // Converts Linux clock ticks to a wall time delta. 87 TimeDelta ClockTicksToTimeDelta(int clock_ticks); 88 89 } // namespace internal 90 } // namespace base 91 92 #endif // BASE_PROCESS_INTERNAL_LINUX_H_ 93