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 seg-
ments.-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 short-
hand 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 segments for shared memory, and number of semaphores in each set for semaphores. See below for meaning of columns in a listing.-c Prints creator's login name and group name. See
below.SunOS 5.11 Last change: 17 Jan 2008 1
User Commands ipcs(1)
-D mtype Displays, in hexadecimal and ASCII, the contents
of all messages of type mtype found on any mes-
sage queue that the user invoking ipcs has per-
mission 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 messagequeues, process ID of creating process, and pro-
cess ID of last process to attach or detach on shared memory segments. See below.-t Prints time information: time of the last con-
trol operation that changed the access permis-
sions 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 sema-
phores. 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 exe-
cuting in the global zone.-Z When executing in the global zone, prints infor-
mation about all zones. Otherwise, printsSunOS 5.11 Last change: 17 Jan 2008 2
User Commands ipcs(1)
information about the zone in which the commandis executing. The output includes the zone asso-
ciated with each facility. The column headings and the meaning of the columns in anipcs 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 information is pro-
vided for each facility; they do not determine which facili-
ties 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 toIPC_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).- The corresponding special flag is
not set.SunOS 5.11 Last change: 17 Jan 2008 3
User Commands ipcs(1)
The next nine characters are interpreted as three sets of three bits each. Thefirst set refers to the owner's permis-
sions; the next to permissions of othersin the user-group of the facility entry;
and the last to all others. Within eachset, the first character indicates per-
mission to read, the second character indicates permission to write or alterthe facility entry, and the last charac-
ter 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 facil-
ity 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 crea-
tor 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 out-
standing on the associated message queue.SunOS 5.11 Last change: 17 Jan 2008 4
User Commands ipcs(1)
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 associ-
ated 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 toattach or detach the shared memory seg-
ment. ATIME (a,A,t) The time the last attach was completed to the associated shared memory segment.SunOS 5.11 Last change: 17 Jan 2008 5
User Commands ipcs(1)
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 asso-
ciated 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 asso-
ciated. ENVIRONMENT VARIABLES See environ(5) for descriptions of the following environmentvariables that affect the execution of ipcs: LANG, LC_ALL,
LC_CTYPE, LC_MESSAGES, and NLSPATH.
TZ Determine the timezone for the time strings written byipcs.
FILES /etc/group group names /etc/passwd user namesATTRIBUTES
See attributes(5) for descriptions of the following attri-
butes:SunOS 5.11 Last change: 17 Jan 2008 6
User Commands ipcs(1)
____________________________________________________________
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
|_____________________________|_____________________________|
| Availability | system/ipc ||_____________________________|_____________________________|
| Interface Stability | Committed ||_____________________________|_____________________________|
| Standard | See standards(5). ||_____________________________|_____________________________|
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) NOTESThings can change while ipcs is running. The information it
gives is guaranteed to be accurate only when it was retrieved.SunOS 5.11 Last change: 17 Jan 2008 7