ipcs(1) 						      General Commands Manual							   ipcs(1)

NAME

       ipcs - report status of interprocess communication facilities

SYNOPSIS

       core] namelist]

DESCRIPTION

       displays certain information about active interprocess communication facilities.  With no options, displays information in short format for
       the message queues, shared memory segments, and semaphores that are currently active in the system.

   Options
       The following options restrict the display to the corresponding facilities.

	      (none)	     This is equivalent to

	      Display information about active shared memory segments.

	      Display information about active message queues.

	      Display information about active semaphores.

       The following options add columns of data to the display.  See "Column Description" below.

	      (none)	     Display default columns: for all facilities:

	      Display all columns, as appropriate.
			     This is equivalent to

	      Display largest-allowable-size information:
			     for message queues: for shared memory segments: for semaphores:

	      Display creator's login name and group name:
			     for all facilities:

	      Display information on outstanding usage:
			     for message queues: for shared memory segments:

	      Display process number information:
			     for message queues: for shared memory segments:

	      Display time information:
			     for all facilities: for message queues: for shared memory segments: for semaphores:

       The following options redefine the sources of information.

	      Use	     core in place of core can be a core file or a directory created by or

	      Use file	     namelist or the namelist within core in place of It opens a crash dump for reading. Please refer  to  cr_open(3)  for
			     more details.

   Column Descriptions
       The  column headings and the meaning of the columns in an listing are given below.  The columns are printed from left to right in the order
       shown below.
	      Facility type:

	      Shared memory segment
	      Message queue
	      Semaphore

       The identifier for the facility entry.

       The key used as an argument to
	      or to create the facility entry.	(Note: The key of a shared memory segment is changed to when the segment has  been  removed  until
	      all processes attached to the segment detach it.)

       The facility access modes and flags:
	      The mode consists of 11 characters that are interpreted as follows:

	      The first two characters can be:

       A process is waiting on a
       A process is waiting on a
       The associated shared memory segment has been removed.
	      It will disappear when the last process attached to the segment detaches it.
       The associated shared memory segment is to be cleared when the
	      first attach is executed.
       The corresponding special flag is not set.

	      The  next 9 characters are interpreted as three sets of three characters each.  The first set refers to the owner's permissions, the
	      next to permissions of others in the group of the facility entry, and the last to all others.

	      Within each set, the first character indicates permission to read, the second character indicates permission to write or	alter  the
	      facility entry, and the last character is currently unused.

       Read permission is granted.
       Write permission is granted.
       Alter permission is granted.
       The indicated permission is not granted.

       The login name of the owner of the facility entry.

       The group name of the group of the owner of the facility entry.

       The login name of the creator of the facility entry.

       The group name of the group of the creator of the facility entry.

       The number of bytes in messages
	      currently outstanding on the associated message queue.

       The number of messages currently outstanding
	      on the associated message queue.

       The maximum number of bytes allowed
	      in messages outstanding on the associated message queue.

       The process ID of the last process to send a message
	      to the associated message queue.

       The process ID of the last process to receive a message
	      from the associated message queue.

       The time the last
	      message was sent to the associated message queue.

       The time the last
	      message was received from the associated message queue.

       The time when the associated facility entry was created or changed.

       The number of processes attached to the associated shared memory segment.

       The size of the associated shared memory segment.

       The process ID of the creating process of the shared memory segment.

       The process ID of the last process
	      to attach or detach the shared memory segment.

       The time the last
	      attach was completed to the associated shared memory segment.

       The time the last
	      detach was completed on the associated shared memory segment.

       The number of semaphores in the set associated with the semaphore entry.

       The time the last
	      semaphore operation was completed on the set associated with the semaphore entry.

WARNINGS

       produces  only  an  approximate indication of actual system status because system processes are continually changing while is acquiring the
       requested information.

       Do not rely on the exact field widths and spacing of the output, as these will vary depending on the system, the release of HP-UX, and  the
       data to be displayed.

FILES

       Kernel virtual memory
       Group names
       User names
       System namelist

SEE ALSO

       msgop(2), semop(2), shmop(2).

STANDARDS CONFORMANCE

																	   ipcs(1)