# proc_pid_stat

## NAME



           /proc/pid/stat - status information
    


## DESCRIPTION



           _/proc/_ pid _/stat_
                  Status information about the process.  This is used by
                  ps(1).  It is defined in the kernel source file
                  _fs/proc/array.c_.
    
                  The fields, in order, with their proper scanf(3) format
                  specifiers, are listed below.  Whether or not certain of
                  these fields display valid information is governed by a
                  ptrace access mode **PTRACE_MODE_READ_FSCREDS** |
                  **PTRACE_MODE_NOAUDIT** check (refer to ptrace(2)).  If the
                  check denies access, then the field value is displayed as
                  0.  The affected fields are indicated with the marking
                  [PT].
    
                  (1) _pid_ %d
                         The process ID.
    
                  (2) _comm_ %s
                         The filename of the executable, in parentheses.
                         Strings longer than **TASK_COMM_LEN**(16) characters
                         (including the terminating null byte) are silently
                         truncated.  This is visible whether or not the
                         executable is swapped out.
    
                  (3) _state_ %c
                         One of the following characters, indicating process
                         state:
    
                         R      Running
    
                         S      Sleeping in an interruptible wait
    
                         D      Waiting in uninterruptible disk sleep
    
                         Z      Zombie
    
                         T      Stopped (on a signal) or (before Linux
                                2.6.33) trace stopped
    
                         t      Tracing stop (Linux 2.6.33 onward)
    
                         W      Paging (only before Linux 2.6.0)
    
                         X      Dead (from Linux 2.6.0 onward)
    
                         x      Dead (Linux 2.6.33 to 3.13 only)
    
                         K      Wakekill (Linux 2.6.33 to 3.13 only)
    
                         W      Waking (Linux 2.6.33 to 3.13 only)
    
                         P      Parked (Linux 3.9 to 3.13 only)
    
                         I      Idle (Linux 4.14 onward)
    
                  (4) _ppid_ %d
                         The PID of the parent of this process.
    
                  (5) _pgrp_ %d
                         The process group ID of the process.
    
                  (6) _session_ %d
                         The session ID of the process.
    
                  (7) _tty_nr_ %d
                         The controlling terminal of the process.  (The minor
                         device number is contained in the combination of
                         bits 31 to 20 and 7 to 0; the major device number is
                         in bits 15 to 8.)
    
                  (8) _tpgid_ %d
                         The ID of the foreground process group of the
                         controlling terminal of the process.
    
                  (9) _flags_ %u
                         The kernel flags word of the process.  For bit
                         meanings, see the PF_* defines in the Linux kernel
                         source file _include/linux/sched.h_.  Details depend
                         on the kernel version.
    
                         The format for this field was %lu before Linux 2.6.
    
                  (10) _minflt_ %lu
                         The number of minor faults the process has made
                         which have not required loading a memory page from
                         disk.
    
                  (11) _cminflt_ %lu
                         The number of minor faults that the process's
                         waited-for children have made.
    
                  (12) _majflt_ %lu
                         The number of major faults the process has made
                         which have required loading a memory page from disk.
    
                  (13) _cmajflt_ %lu
                         The number of major faults that the process's
                         waited-for children have made.
    
                  (14) _utime_ %lu
                         Amount of time that this process has been scheduled
                         in user mode, measured in clock ticks (divide by
                         _sysconf(_SC_CLK_TCK)_).  This includes guest time,
                         _guest_time_ (time spent running a virtual CPU, see
                         below), so that applications that are not aware of
                         the guest time field do not lose that time from
                         their calculations.
    
                  (15) _stime_ %lu
                         Amount of time that this process has been scheduled
                         in kernel mode, measured in clock ticks (divide by
                         _sysconf(_SC_CLK_TCK)_).
    
                  (16) _cutime_ %ld
                         Amount of time that this process's waited-for
                         children have been scheduled in user mode, measured
                         in clock ticks (divide by _sysconf(_SC_CLK_TCK)_).
                         (See also times(2).)  This includes guest time,
                         _cguest_time_ (time spent running a virtual CPU, see
                         below).
    
                  (17) _cstime_ %ld
                         Amount of time that this process's waited-for
                         children have been scheduled in kernel mode,
                         measured in clock ticks (divide by
                         _sysconf(_SC_CLK_TCK)_).
    
                  (18) _priority_ %ld
                         (Explanation for Linux 2.6) For processes running a
                         real-time scheduling policy (_policy_ below; see
                         sched_setscheduler(2)), this is the negated
                         scheduling priority, minus one; that is, a number in
                         the range -2 to -100, corresponding to real-time
                         priorities 1 to 99.  For processes running under a
                         non-real-time scheduling policy, this is the raw
                         nice value (setpriority(2)) as represented in the
                         kernel.  The kernel stores nice values as numbers in
                         the range 0 (high) to 39 (low), corresponding to the
                         user-visible nice range of -20 to 19.
    
                         Before Linux 2.6, this was a scaled value based on
                         the scheduler weighting given to this process.
    
                  (19) _nice_ %ld
                         The nice value (see setpriority(2)), a value in the
                         range 19 (low priority) to -20 (high priority).
    
                  (20) _num_threads_ %ld
                         Number of threads in this process (since Linux 2.6).
                         Before Linux 2.6, this field was hard coded to 0 as
                         a placeholder for an earlier removed field.
    
                  (21) _itrealvalue_ %ld
                         The time in jiffies before the next **SIGALRM** is sent
                         to the process due to an interval timer.  Since
                         Linux 2.6.17, this field is no longer maintained,
                         and is hard coded as 0.
    
                  (22) _starttime_ %llu
                         The time the process started after system boot.
                         Before Linux 2.6, this value was expressed in
                         jiffies.  Since Linux 2.6, the value is expressed in
                         clock ticks (divide by _sysconf(_SC_CLK_TCK)_).
    
                         The format for this field was %lu before Linux 2.6.
    
                  (23) _vsize_ %lu
                         Virtual memory size in bytes.
    
                  (24) _rss_ %ld
                         Resident Set Size: number of pages the process has
                         in real memory.  This is just the pages which count
                         toward text, data, or stack space.  This does not
                         include pages which have not been demand-loaded in,
                         or which are swapped out.  This value is inaccurate;
                         see _/proc/_ pid _/statm_ below.
    
                  (25) _rsslim_ %lu
                         Current soft limit in bytes on the rss of the
                         process; see the description of **RLIMIT_RSS** in
                         getrlimit(2).
    
                  (26) _startcode_ %lu [PT]
                         The address above which program text can run.
    
                  (27) _endcode_ %lu [PT]
                         The address below which program text can run.
    
                  (28) _startstack_ %lu [PT]
                         The address of the start (i.e., bottom) of the
                         stack.
    
                  (29) _kstkesp_ %lu [PT]
                         The current value of ESP (stack pointer), as found
                         in the kernel stack page for the process.
    
                  (30) _kstkeip_ %lu [PT]
                         The current EIP (instruction pointer).
    
                  (31) _signal_ %lu
                         The bitmap of pending signals, displayed as a
                         decimal number.  Obsolete, because it does not
                         provide information on real-time signals; use
                         _/proc/_ pid _/status_ instead.
    
                  (32) _blocked_ %lu
                         The bitmap of blocked signals, displayed as a
                         decimal number.  Obsolete, because it does not
                         provide information on real-time signals; use
                         _/proc/_ pid _/status_ instead.
    
                  (33) _sigignore_ %lu
                         The bitmap of ignored signals, displayed as a
                         decimal number.  Obsolete, because it does not
                         provide information on real-time signals; use
                         _/proc/_ pid _/status_ instead.
    
                  (34) _sigcatch_ %lu
                         The bitmap of caught signals, displayed as a decimal
                         number.  Obsolete, because it does not provide
                         information on real-time signals; use
                         _/proc/_ pid _/status_ instead.
    
                  (35) _wchan_ %lu [PT]
                         This is the "channel" in which the process is
                         waiting.  It is the address of a location in the
                         kernel where the process is sleeping.  The
                         corresponding symbolic name can be found in
                         _/proc/_ pid _/wchan_.
    
                  (36) _nswap_ %lu
                         Number of pages swapped (not maintained).
    
                  (37) _cnswap_ %lu
                         Cumulative nswap for child processes (not
                         maintained).
    
                  (38) _exit_signal_ %d (since Linux 2.1.22)
                         Signal to be sent to parent when we die.
    
                  (39) _processor_ %d (since Linux 2.2.8)
                         CPU number last executed on.
    
                  (40) _rt_priority_ %u (since Linux 2.5.19)
                         Real-time scheduling priority, a number in the range
                         1 to 99 for processes scheduled under a real-time
                         policy, or 0, for non-real-time processes (see
                         sched_setscheduler(2)).
    
                  (41) _policy_ %u (since Linux 2.5.19)
                         Scheduling policy (see sched_setscheduler(2)).
                         Decode using the SCHED_* constants in _linux/sched.h_.
    
                         The format for this field was %lu before Linux
                         2.6.22.
    
                  (42) _delayacct_blkio_ticks_ %llu (since Linux 2.6.18)
                         Aggregated block I/O delays, measured in clock ticks
                         (centiseconds).
    
                  (43) _guest_time_ %lu (since Linux 2.6.24)
                         Guest time of the process (time spent running a
                         virtual CPU for a guest operating system), measured
                         in clock ticks (divide by _sysconf(_SC_CLK_TCK)_).
    
                  (44) _cguest_time_ %ld (since Linux 2.6.24)
                         Guest time of the process's children, measured in
                         clock ticks (divide by _sysconf(_SC_CLK_TCK)_).
    
                  (45) _start_data_ %lu (since Linux 3.3) [PT]
                         Address above which program initialized and
                         uninitialized (BSS) data are placed.
    
                  (46) _end_data_ %lu (since Linux 3.3) [PT]
                         Address below which program initialized and
                         uninitialized (BSS) data are placed.
    
                  (47) _start_brk_ %lu (since Linux 3.3) [PT]
                         Address above which program heap can be expanded
                         with brk(2).
    
                  (48) _arg_start_ %lu (since Linux 3.5) [PT]
                         Address above which program command-line arguments
                         (_argv_) are placed.
    
                  (49) _arg_end_ %lu (since Linux 3.5) [PT]
                         Address below program command-line arguments (_argv_)
                         are placed.
    
                  (50) _env_start_ %lu (since Linux 3.5) [PT]
                         Address above which program environment is placed.
    
                  (51) _env_end_ %lu (since Linux 3.5) [PT]
                         Address below which program environment is placed.
    
                  (52) _exit_code_ %d (since Linux 3.5) [PT]
                         The thread's exit status in the form reported by
                         waitpid(2).
    


* * *