ipcs(1) 						      General Commands Manual							   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 standards 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 maximum 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 information about active semaphore set.	Writes the follow-
       ing: 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 pro-
       vided for each facility; they do not determine which facilities are listed.  Type of facility: Message queue Shared  memory  segment  Sema-
       phore  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 char-
	      acter 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 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  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 associated 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 memory segment.  The time when the last detach was completed on the associated shared memory segment.  The  number  of  sema-
	      phores  in the set associated with the semaphore entry.  The time when the last semaphore operation was completed on the set associ-
	      ated 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)