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

NAME
     ipcs — report System V interprocess communication facilities status

SYNOPSIS
     ipcs [-abcMmopQqSsTtu]

DESCRIPTION
     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
	     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.

     -M	     Display system information about shared memory.

     -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 system information about messages queues.

     -q	     Display information about active message queues.

     -S	     Display system information about semaphores.

     -s	     Display information about active semaphores.

     -T	     Display system information about shared memory, message queues
	     and 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	     Show system wide usage of IPC resources.  This information is
	     added as a list after the appropriate shared memory, messages
	     queue or semaphore information output.

     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.

     On Cygwin, System V IPC only works when the cygserver service is running
     and the CYGWIN environment variable for the client contains the word
     "server".	See /usr/share/doc/Cygwin/cygserver.README and the Cygwin
     user's guide.

SEE ALSO
     ipcrm(1)

STANDARDS
     The ipcs utility is compliant with the X/Open Portability Guide Issue 4
     (“XPG4”) specification.

     The flags [-MQSTu] are extensions to that specification.

AUTHORS
     Thorsten Lockert ⟨tholo@sigmasoft.com⟩
     Cygwin specific changes: Corinna Vinschen

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

BSD				  May 1, 2024				   BSD

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