NAME    [Toc]    [Back]

     ipcs - report System V interprocess communication facilities
status

SYNOPSIS    [Toc]    [Back]

     ipcs [-abcmopqstMQST] [-C core] [-N system]

DESCRIPTION    [Toc]    [Back]

     The  ipcs program 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 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 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.

     -C core
             Extract  values  associated  with the name list from
the specified
             core instead of the running kernel.

     -M      Display system information about shared memory.

     -N system
             Extract the name list from the specified system  instead of the
             running 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, information
 about all active IPC facilities is listed.

RESTRICTIONS    [Toc]    [Back]

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

SEE ALSO    [Toc]    [Back]

     ipcrm(1)

AUTHORS    [Toc]    [Back]

     Thorsten Lockert <tholo@sigmasoft.com>

BUGS    [Toc]    [Back]

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

OpenBSD      3.6                           June      18,     1994