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IPCS(1)			  BSD General Commands Manual		       IPCS(1)

NAME
     ipcs — report System V interprocess communication facilities status

SYNOPSIS
     ipcs [-abcmopqstMQST] [-C core] [-N system] [-g group] [-u user]

DESCRIPTION
     The ipcs utility 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
	     options.)

     -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.

     -g group
	     Display information about IPC mechanisms owned by group.  Group
	     specification can be in the form of a numeric GID or a group
	     name.

     -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 messages
	     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 memory segment.

     -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.

     -u user
	     Display information about IPC mechanisms owned by user.  User
	     specification can be in the form of a numeric UID or a user name.

     -C core
	     Extract values associated with the name list from the specified
	     core instead of the default “/dev/kmem”.

     -M	     Display system information about shared memory.

     -N system
	     Extract the name list from the specified system instead of the
	     default “/boot/kernel”.

     -Q	     Display system information about messages queues.

     -S	     Display system information about semaphores.

     -T	     Display system information about shared memory, message queues
	     and semaphores.

     If none of the -M, -m, -Q, -q, -S, or -s options are specified, informa‐
     tion about all active IPC facilities is listed.

RESTRICTIONS
     System data structures may change while ipcs is running; the output of
     ipcs is not guaranteed to be consistent.

FILES
     /dev/kmem	  default kernel memory
     /boot/kernel
		  default system name list

SEE ALSO
     ipcrm(1)

AUTHORS
     Thorsten Lockert ⟨tholo@sigmasoft.com⟩

BUGS
     This manual page is woefully incomplete, because it does not at all
     attempt to explain the information printed by ipcs.

BSD			       September 2, 2008			   BSD

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