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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).

SEE ALSO

       proc(5), proc_pid_status(5)