Provided by: manpages_6.8-2_all 
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)