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IPCS(1) OpenBSD Reference Manual IPCS(1)
ipcs - report System V interprocess communication facilities status
ipcs [-abcmopqstMQST] [-C core] [-N system]
The ipcs program provides information on System V interprocess communica-
tion (IPC) facilities on the system.
The options are as follows:
-a Show the maximum amount of information possible when displaying
active semaphores, message queues, and shared memory segments.
(This is shorthand for specifying the -b, -c, -o, -p, and -t op-
-b Show the maximum allowed sizes for active semaphores, message
queues, and shared memory segments. The ``maximum allowed size''
is the maximum number of bytes in a message on a message queue,
the size of a shared memory segment, or the number of semaphores
in a set of semaphores.
-c Show the creator's name and group for active semaphores, message
queues, and shared memory segments.
-m Display information about active shared memory segments.
-o Show outstanding usage for active message queues, and shared mem-
ory segments. The ``outstanding usage'' is the number of mes-
sages in a message queue, or the number of processes attached to
a shared memory segment.
-p Show the process ID information for active semaphores, message
queues, and shared memory segments. The ``process ID
information'' is the last process to send a message to or receive
a message from a message queue, the process that created a
semaphore, or the last process to attach or detach a shared memo-
-q Display information about active message queues.
-s Display information about active semaphores.
-t Show access times for active semaphores, message queues, and
shared memory segments. The access times is the time of the last
control operation on an IPC object, the last send or receive of a
message, the last attach or detach of a shared memory segment, or
the last operation on a semaphore.
Extract values associated with the name list from the specified
core instead of the default /dev/kmem.
-M Display system information about shared memory.
Extract the name list from the specified system instead of the
default /dev/ksyms (or /bsd if /dev/ksyms is not available).
-Q Display system information about messages queues.
-S Display system information about semaphores.
-T Display system information about shared memory, message queues
If none of the -M, -m, -Q, -q, -S, or -s options are specified, informa-
tion about all active IPC facilities is listed.
System data structures may change while ipcs is running; the output of
ipcs is not guaranteed to be consistent.
This manual page is woefully incomplete, because it does not at all at-
tempt to explain the information printed by ipcs.
/dev/kmem default kernel memory
/dev/ksyms default system name list
Thorsten Lockert <email@example.com>
OpenBSD 2.6 June 18, 1994 2
Source: OpenBSD 2.6 man pages. Copyright: Portions are copyrighted by BERKELEY
SOFTWARE DESIGN, INC., The Regents of the University of California, Massachusetts
Institute of Technology, Free Software Foundation, FreeBSD Inc., and others.
(Corrections, notes, and links courtesy of RocketAware.com)
FreeBSD Sources for ipcs(1)
OpenBSD sources for ipcs(1)
Up to: Local Process Communication - Communication between processes running on the same system. Synchronization. File locking. Signals. FIFOs, pipes, et al
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