ipcs(1) 							   User Commands							   ipcs(1)

NAME

       ipcs - report inter-process communication facilities status

SYNOPSIS

       ipcs [-aAbciJmopqstZ] [-D mtype] [-z zone]

DESCRIPTION

       The ipcs utility prints information about active inter-process communication facilities. The information that is displayed is controlled by
       the options supplied. Without options, information is printed in short format for message queues, shared memory, and  semaphores  that  are
       currently active in the system.

OPTIONS

       The following options are supported:

       -m	Prints information about active shared memory segments.

       -q	Prints information about active message queues.

       -s	Prints information about active semaphores.

       If  -m,	-q, or -s are specified, information about only those indicated is printed. If none of these three is specified, information about
       all three is printed subject to these options:

       -a	       Uses all XCU5 print options. (This is a shorthand notation for -b, -c, -o, -p, and -t.)

       -A	       Uses all print options. (This is a shorthand notation for -b, -c, -i, -J, -o, -p, and -t.)

       -b	       Prints information on biggest allowable size: maximum number of bytes in messages on queue for message queues, size of seg-
		       ments  for  shared memory, and number of semaphores in each set for semaphores. See below for meaning of columns in a list-
		       ing.

       -c	       Prints creator's login name and group name. See below.

       -D mtype        Displays, in hexadecimal and ASCII, the contents of all messages of type mtype found on any message  queue  that  the  user
		       invoking  ipcs  has  permission to read. If mtype is 0, all messages are displayed. If mtype is negative, all messages with
		       type less than or equal to the absolute value of mtype are displayed. (See msgrcv(2) and msgsnap(2)).

       -i	       Prints number of ISM attaches to shared memory segments.

       -J	       Prints the creator's project.

       -o	       Prints information on outstanding usage: number of messages on queue and total number of bytes in  messages  on	queue  for
		       message queues and number of processes attached to shared memory segments.

       -p	       Prints  process	number	information: process ID of last process to send a message, process ID of last process to receive a
		       message on message queues, process ID of creating process, and process ID of last process to attach  or	detach	on  shared
		       memory segments. See below.

       -t	       Prints time information: time of the last control operation that changed the access permissions for all facilities, time of
		       last msgsnd(2) and last msgrcv(2) on message queues, time of last shmat(2)  and	last  shmdt(2  )  on  shared  memory  (see
		       shmop(2)), time of last semop(2) on semaphores. See below.

       -z zone	       Prints  information about facilities associated with the specified zone (see zones(5)). The zone can be specified as either
		       a name or a numeric id. The default is to display information about the zone in which the command is executing. Notice that
		       this option is only useful when executing in the global zone.

       -Z	       When  executing	in  the  global zone, prints information about all zones.  Otherwise, prints information about the zone in
		       which the command is executing. The output includes the zone associated with each facility.

       The column headings and the meaning of the columns in an ipcs listing are given below. The letters in parentheses indicate the options that
       cause the corresponding heading to appear and "all" means that the heading always appears. Note: These options only determine what informa-
       tion is provided for each facility; they do not determine which facilities are listed.

       T (all)		       Type of the facility:

			       q	message queue

			       m	shared memory segment

			       s	semaphore

       ID (all) 	       The identifier for the facility entry.

       KEY (all)	       The key used as an argument to msgget(2), semget(2), or shmget(2) to create the facility entry. (Note: The  key	of
			       a shared memory segment is changed to IPC_PRIVATE when the segment has been removed until all processes attached to
			       the segment detach it.)

       MODE (all)	       The facility access modes and flags: The mode consists of 11 characters that are interpreted as follows. The  first
			       two characters are:

			       R	A process is waiting on a msgrcv(2).

			       S	A process is waiting on a msgsnd(2).

			       D	The associated shared memory segment has been removed. It will disappear when the last process attached to
					the segment detaches it. (Note: If the shared memory segment identifier is removed via an IPC_RMID call to
					shmctl(2) before the process has detached from the segment with shmdt(2), the segment is no longer visible
					to ipcs and it will not appear in the ipcs output.)

			       C	The associated shared memory segment is to be cleared when the first attach is executed.

			       -	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 per-
			       missions;  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:

			       r	Read permission is granted.

			       w	Write permission is granted.

			       a	Alter permission is granted.

			       -	The indicated permission is not granted.

       OWNER (all)	       The login name of the owner of the facility entry.

       GROUP (all)	       The group name of the group of the owner of the facility entry.

       CREATOR (a,A,c)	       The login name of the creator of the facility entry.

       CGROUP (a,A,c)	       The group name of the group of the creator of the facility entry.

       CBYTES (a,A,o)	       The number of bytes in messages currently outstanding on the associated message queue.

       QNUM (a,A,o)	       The number of messages currently outstanding on the associated message queue.

       QBYTES (a,A,b)	       The maximum number of bytes allowed in messages outstanding on the associated message queue.

       LSPID (a,A,p)	       The process ID of the last process to send a message to the associated queue.

       LRPID (a,A,p)	       The process ID of the last process to receive a message from the associated queue.

       STIME (a,A,t)	       The time the last message was sent to the associated queue.

       RTIME (a,A,t)	       The time the last message was received from the associated queue.

       CTIME (a,A,t)	       The time when the associated entry was created or changed.

       ISMATTCH (a,i)	       The number of ISM attaches to the associated shared memory segments.

       NATTCH (a,A,o)	       The number of processes attached to the associated shared memory segment.

       SEGSZ (a,A,b)	       The size of the associated shared memory segment.

       CPID (a,A,p)	       The process ID of the creator of the shared memory entry.

       LPID (a,A,p)	       The process ID of the last process to attach or detach the shared memory segment.

       ATIME (a,A,t)	       The time the last attach was completed to the associated shared memory segment.

       DTIME (a,A,t)	       The time the last detach was completed on the associated shared memory segment.

       NSEMS (a,A,b)	       The number of semaphores in the set associated with the semaphore entry.

       OTIME (a,A,t)	       The time the last semaphore operation was completed on the set associated with the semaphore entry.

       PROJECT (J,A)	       The project name of the creator of the facility entry.

       ZONE (Z) 	       The zone with which the facility is associated.

ENVIRONMENT VARIABLES

       See  environ(5) for descriptions of the following environment variables that affect the execution of  ipcs: LANG, LC_ALL, LC_CTYPE, LC_MES-
       SAGES, and NLSPATH.

       TZ	Determine the timezone for the time strings written by ipcs.

FILES

       /etc/group	       group names

       /etc/passwd	       user names

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWipc			   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       ipcrm(1), msgget(2), msgids(2),	msgrcv(2),  msgsnap(2),  msgsnd(2),  semget(2),  semids(2),  semop(2),	shmctl(2),  shmget(2),	shmids(2),
       shmop(2), attributes(5), environ( 5), standards(5), zones(5)

NOTES

       Things can change while ipcs is running. The information it gives is guaranteed to be accurate only when it was retrieved.

SunOS 5.10							    9 Jan 2004								   ipcs(1)