SunOS man pages : ipcs (1)
User Commands ipcs(1)
NAME
ipcs - report inter-process communication facilities status
SYNOPSIS
/usr/bin/ipcs [ -aAbcimopqst ] [ -C corefile ] [
-N namelist ]
/usr/xpg4/bin/ipcs [ -aAbcimopqst ] [ -C corefile ] [
-N namelist ]
DESCRIPTION
The utility ipcs 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.
/usr/xpg4/bin/ipcs
See NOTES.
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 shorthand
notation for -b, -c, -o, -p, and -t.)
-A Uses all print options. (This is a shorthand notation
for -b, -c, -i, -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.
-C corefile
Uses the file corefile in place of /dev/mem and
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User Commands ipcs(1)
/dev/kmem. Use a core dump obtained from savecore(1M)
in place of /dev/mem and /dev/kmem. Without the -C
option (default), the running system image is used.
-i Prints number of ISM attaches to shared memory seg-
ments.
-N namelist
Uses the file namelist in place of /dev/ksyms.
-o Prints information on outstanding usage: number of
messages on queue and total number of bytes in mes-
sages 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.
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; "all" means that the heading always appears. Note:
These options only determine what information 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),
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User Commands ipcs(1)
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 visi-
ble to ipcs and it will not appear in the ipcs out-
put.)
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 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 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.
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User Commands ipcs(1)
GROUP (all)
The group name of the group of the owner of the facil-
ity 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 out-
standing 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 mes-
sage 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 asso-
ciated 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)
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User Commands ipcs(1)
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 associ-
ated shared memory segment.
DTIME (a,A,t)
The time the last detach was completed on the associ-
ated shared memory segment.
NSEMS (a,A,b)
The number of semaphores in the set associated with
the semaphore entry.
NSEMS (a,A,b,t)
(For /usr/xpg4/bin/ipcs) 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.
ENVIRONMENT VARIABLES
See environ(5) for descriptions of the following environ-
ment variables that affect the execution of ipcs: LANG,
LC_ALL, LC_CTYPE, LC_MESSAGES, and NLSPATH.
TZ Determine the timezone for the time strings written by
ipcs.
FILES
/etc/group
group names
/etc/passwd
user names
/dev/mem
memory
/dev/ksyms
system namelist
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User Commands ipcs(1)
ATTRIBUTES
See attributes(5) for descriptions of the following attri-
butes:
____________________________________________________________
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
|_____________________________|_____________________________|
| Availability | SUNWipc (32-bit) |
|_____________________________|_____________________________|
| | SUNWipcx (64-bit) |
|_____________________________|_____________________________|
SEE ALSO
ipcrm(1), savecore(1M), msgget(2), msgrcv(2), msgsnd(2),
semget(2), semop(2), shmctl(2), shmget(2), shmop(2), attributes(5)
, environ( 5)
NOTES
If the user specifies either the -C or -N flag, the real and
effective UID/GID is set to the real UID/GID of the user
invoking ipcs.
Things can change while ipcs is running; the information it
gives is guaranteed to be accurate only when it was
retrieved.
When the corresponding facility is not installed or has not
been used since the last reboot, /usr/xpg4/bin/ipcs will
report
"%s facility not in system.\n", facility
while /usr/bin/ipcs will report
"%s facility is inactive.\n", facility
where facility is "Message Queue", "Shared Memory", or
"Semaphore", as appropriate.
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