ipcs(1) [osx man page]

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

NAME

     ipcs -- report System V interprocess communication facilities status

SYNOPSIS

     ipcs [-abcMmopQqSsTt]

DESCRIPTION

     The ipcs utility provides information on System V interprocess communication (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 memory 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 con-
	     trol 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.

     If none of the -M, -m, -Q, -q, -S, or -s options are specified, information 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.

BUGS

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

SEE ALSO

     ipcrm(1)

AUTHORS

     Thorsten Lockert <tholo@sigmasoft.com>

BSD
								   June 18, 1994							       BSD

Check Out this Related Man Page

IPCS(1) 							   User Commands							   IPCS(1)

NAME

       ipcs - show information on IPC facilities

SYNOPSIS

       ipcs [options]

DESCRIPTION

       ipcs  shows  information  on the inter-process communication facilities for which the calling process has read access.  By default it shows
       information about all three resources: shared memory segments, message queues, and semaphore arrays.

OPTIONS

       -i, --id id
	      Show full details on just the one resource element identified by id.  This option needs  to  be  combined  with  one  of	the  three
	      resource options: -m, -q or -s.

       -h, --help
	      Display help text and exit.

       -V, --version
	      Display version information and exit.

   Resource options
       -m, --shmems
	      Write information about active shared memory segments.

       -q, --queues
	      Write information about active message queues.

       -s, --semaphores
	      Write information about active semaphore sets.

       -a, --all
	      Write information about all three resources (default).

   Output formats
       Of these options only one takes effect: the last one specified.

       -c, --creator
	      Show creator and owner.

       -l, --limits
	      Show resource limits.

       -p, --pid
	      Show PIDs of creator and last operator.

       -t, --time
	      Write  time information.	The time of the last control operation that changed the access permissions for all facilities, the time of
	      the last msgsnd(2) and msgrcv(2) operations on message queues, the time of the last shmat(2) and shmdt(2) operations on shared  mem-
	      ory, and the time of the last semop(2) operation on semaphores.

       -u, --summary
	      Show status summary.

   Representation
       These affect only the -l (--limits) option.

       -b, --bytes
	      Print sizes in bytes.

       --human
	      Print sizes in human-readable format.

SEE ALSO

       ipcmk(1), ipcrm(1), msgrcv(2), msgsnd(2), semget(2), semop(2), shmat(2), shmdt(2), shmget(2)

CONFORMING TO

       The  Linux  ipcs  utility  is  not  fully compatible to the POSIX ipcs utility.	The Linux version does not support the POSIX -a, -b and -o
       options, but does support the -l and -u options not defined by POSIX.  A portable application shall not use the -a,  -b,  -o,  -l,  and	-u
       options.

AUTHOR

       Krishna Balasubramanian <balasub@cis.ohio-state.edu>

AVAILABILITY

       The ipcs command is part of the util-linux package and is available from Linux Kernel Archive <https://www.kernel.org/pub/linux/utils/util-
       linux/>.

util-linux							     July 2014								   IPCS(1)

Linux and UNIX Man Pages

ipcs(1) [osx man page]

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