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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 seg-ments. segments.
             ments.  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 seg-ments. segments.
             ments.

     -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 seg-ments. segments.
             ments.  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 opera-tion operation
             tion on a semaphore.

     If none of the -M, -m, -Q, -q, -S, or -s options are specified, information about all active IPC facil-ities facilities
     ities 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