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ipcs(1)								       ipcs(1)

NAME
       ipcs - Reports Interprocess Communication (IPC) facility status

SYNOPSIS
       ipcs [-a	 | -bcopt] [-mqs] [-C corefile] [-N namelist]

       The ipcs command writes to the standard output information about active
       Interprocess Communication (IPC) facilities.

STANDARDS
       Interfaces documented on this reference page conform to industry	 stan‐
       dards as follows:

       ipcs: XCU5.0

       Refer  to  the  standards(5)  reference page for more information about
       industry standards and associated tags.

OPTIONS
       Same as specifying the -b, -c, -o, -p, and -t options.  Writes the max‐
       imum number of bytes in message queues, the size of segments for shared
       memory, and the number of semaphores in each semaphore set.  Writes the
       username	 and  group  name  of the user that made the facility.	Writes
       report based on contents of file corefile instead of /dev/kmem.	Writes
       information  about  active shared memory segments.  Writes report based
       on contents of file namelist instead of /vmunix.	 Writes the  following
       usage information: Number of messages on queue Total number of bytes in
       message queues Number of processes attached to shared  memory  segments
       Writes  the  following: Process number of the last process to receive a
       message on message  queues  Process  number  of	the  creating  process
       Process	number	of  last  process to attach or detach on shared memory
       segments Writes information about active message queues.	 Writes infor‐
       mation  about  active semaphore set.  Writes the following: Time of the
       last control operation that changed  the	 access	 permissions  for  all
       facilities  Time	 of  the  last	msgsnd()  and last msgrcv() on message
       queues Time of the last shmat() and last shmdt() on shared memory  Time
       of the last semop() on semaphore sets

DESCRIPTION
       If  you	do not specify any options, ipcs writes information in a short
       form about currently active message  queues,  shared  memory  segments,
       semaphores, remote queues, and local queue headers.

   Column Headings
       The  column  headings and the meaning of the columns in an ipcs listing
       follow.	The letters in parentheses indicate the flags that  cause  the
       corresponding  heading  to appear.  The word all means that the heading
       always appears.	The flags only determine what information is  provided
       for  each  facility; they do not determine which facilities are listed.
       Type of facility: Message queue Shared  memory  segment	Semaphore  The
       identifier  for the facility entry.  The key used as a parameter to the
       msgget(), semget() or shemget()	system	calls  to  make	 the  facility
       entry.

	      Note  that  the  key  of	a  shared memory segment is changed to
	      IPC_PRIVATE when the segment is removed. This change remains  in
	      effect  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: [Tru64 UNIX]  If the associated
	      shared memory segment was locked.	 If a process is waiting on  a
	      msgrcv()	system	call.	If  a process is waiting on a msgsnd()
	      system call.   If	 the  associated  shared  memory  segment  was
	      removed.	It  disappears	when  the last process attached to the
	      segment detaches it.  If the corresponding special flag  is  not
	      set.

	      The  next nine characters are interpreted as three sets of three
	      bits each.  The first set refers to the owner's permissions, the
	      next  to permissions of others in the user 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.

	      The  permissions	are  indicated	as follows: Read permission is
	      granted.	Write permission  is  granted.	 Alter	permission  is
	      granted.	The indicated permission is not granted.  The username
	      of the owner of the facility entry.  The name of the group  that
	      owns  the	 facility  entry.   The username of the creator of the
	      facility entry.  The group name of the group of the  creator  of
	      the facility entry.

	      Note  that  for  the OWNER, GROUP, CREATOR, and CGROUP, the user
	      and group IDs display instead of the usernames.  The  number  of
	      bytes  in	 messages currently outstanding on the associated mes‐
	      sage 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 ID
	      of the last process that sent a message to the associated queue.
	      The ID of the last process that  received	 a  message  from  the
	      associated  queue.   The	time when the last message was sent to
	      the associated queue.   The  time	 when  the  last  message  was
	      received	from  the associated queue.  The time when the associ‐
	      ated 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
	      creator  of the shared memory entry.  The process ID of the last
	      process to attach or detach the shared memory segment.  The time
	      when the last attach was completed to the associated shared mem‐
	      ory segment.  The time when 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 when  the
	      last  semaphore  operation  was  completed on the set associated
	      with the semaphore entry.

EXAMPLES
       Sample output from entering ipcs without options follows.

	Message Queues:
	T      ID	 KEY	MODE	     OWNER    GROUP
	q	4 0x41002ab4 --rw-------      root   system

	Shared Memory:
	T      ID	 KEY	MODE	     OWNER    GROUP
	m	0 0x3253bc5c --rw-rw-rw-      root   system
	m     129	   0 DLrw-------      root   daemon

	Semaphores:
	T      ID	 KEY	MODE	     OWNER    GROUP
	s	0 0x41002ab4 --ra-------      root   system

       Output is formatted differently if the environment variable CMD_ENV  is
       set to the string svr4.	For example:

	IPC status from /dev/kmem as of Thu Mar 26 11:31:03 1998
	T      ID	 KEY	MODE	     OWNER    GROUP
	Message Queues:
	q	4 0x41002ab4 --rw-------      root   system
	Shared Memory:
	m	0 0x3253bc5c --rw-rw-rw-      root   system
	m     129	   0 DLrw-------      root   daemon
	Semaphores:
	s	0 0x41002ab4 --ra-------      root   system

FILES
       Contains user information.  Contains group information.

SEE ALSO
       Commands:  ipcrm(1)

       Functions:  msgrcv(2), msgsnd(2), semop(2), shmat(2), shmdt(2)

								       ipcs(1)
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