Command Reference Guide
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STANDARD Printed by: Nora Chuang [nchuang] STANDARD
/build/1111/BRICK/man1/!!!intro.1
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i
ipcs(1) ipcs(1)
NAME
ipcs - report status of interprocess communication facilities
SYNOPSIS
ipcs [-mqs][-abcopt][-C core][-N namelist]
DESCRIPTION
ipcs displays certain information about active interprocess communication facilities. With no options, ipcs
displays information in short format for the message queues, shared memory segments, and semaphores
that are currently active in the system.
Options
The following options restrict the display to the corresponding facilities.
(none) This is equivalent to -mqs.
-m Display information about active shared memory segments.
-q Display information about active message queues.
-s Display information about active semaphores.
The following options add columns of data to the display. See "Column Description" below.
(none) Display default columns: for all facilities: T, ID, KEY, MODE, OWNER,
GROUP.
-a Display all columns, as appropriate. This is equivalent to -bcopt.
-b Display largest-allowable-size information: for message queues:
QBYTES; for shared
memory segments:
SEGSZ; for semaphores: NSEMS.
-c Display creator’s login name and group name: for all facilities:
CREATOR, CGROUP.
-o Display information on outstanding usage: for message queues: CBYTES, QNUM; for
shared memory segments: NATTCH.
-p Display process number information: for message queues: LSPID, LRPID; for
shared memory segments: CPID, LPID.
-t Display time information: for all facilities: CTIME; for message queues: STIME,
RTIME; for shared memory segments: ATIME, DTIME; for semaphores: OTIME.
The following options redefine the sources of information.
-C core Use core in place of /dev/kmem. core can be a core file or a directory created by
savecrash or savecore.
-N namelist Use file namelist or the namelist within core in place of /stand/vmunix
. It opens
a crash dump for reading. Please refer to cr_open(3) for more details.
Column Descriptions
The column headings and the meaning of the columns in an
ipcs listing are given below. The columns are
printed from left to right in the order shown below.
T Facility type:
m Shared memory segment
q Message queue
s Semaphore
ID The identifier for the facility entry.
KEY The key used as an argument to msgget(), semget(),orshmget() to create
the facility entry. (Note: The key of a shared memory segment is changed to
IPC_PRIVATE when the segment has been removed until all processes attached to
the segment detach it.)
MODE The facility access modes and flags: The mode consists of 11 characters that are inter-
preted as follows:
The first two characters can be:
HP-UX Release 11i: December 2000 − 1 − Section 1−−361
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