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.
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User Commands ipcs(1)
-D mtype Displays, in hexadecimal and ASCI, 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 message
queues, 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, prints
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User Commands ipcs(1)
information about the zone in which the command
is executing. The output includes the zone asso-
ciated 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 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 to
IPCPRIVATE 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.
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User Commands ipcs(1)
The next nine characters are interpreted
as three sets of three bits each. The
first set refers to the owner's permis-
sions; 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 per-
mission to read, the second character
indicates permission to write or alter
the 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.
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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.
ISMATCH (a,i) The number of ISM attaches to the associ-
ated shared memory segments.
NATCH (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 seg-
ment.
ATIME (a,A,t) The time the last attach was completed to
the associated shared memory segment.
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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 environment
variables that affect the execution of ipcs: LANG, LCAL,
LCTYPE, LCMESAGES, and NLSPATH.
TZ Determine the timezone for the time strings written by
ipcs.
FILES
/etc/group group names
/etc/passwd user names
ATRIBUTES
See attributes(5) for descriptions of the following attri-
butes:
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User Commands ipcs(1)
ATRIBUTE TYPE ATRIBUTE VALUE
Availability SUNWipc
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)
NOTES
Things can change while ipcs is running. The information it
gives is guaranteed to be accurate only when it was
retrieved.
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