ipcs man page (irpsun1)

ipcs(1) User Commands ipcs(1)

NAME

ipcs - report inter-process communication facilities status

SYNOPSIS

ipcs [ -abcmopqst ] [ -C corefile ] [ -N namelist ]

AVAILABILITY

SUNWipc

DESCRIPTION

ipcs prints information about active inter-process communi-

cation facilities. Without options, information is printed

in short format for message queues, shared memory, and sema-

phores that are currently active in the system.

The information that is displayed is controlled by the

options supplied.

OPTIONS

-m Print information about active shared memory

segments.

-q Print information about active message

queues.

-s Print information about active semaphores.

If -q, -m, or -s are specified, information about only those

indicated is printed. If none of these three are specified,

information about all three is printed subject to these

options:

-a Use all print options. (This is a shorthand

notation for -b, -c, -o, -p, and -t.)

-b Print 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 mean-

ing of columns in a listing.

-c Print creator's login name and group name.

See below.

-o Print 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 Print process number information: process ID

of last process to send a message, process ID

of last process to receive a message on mes-

sage queues, process ID of creating process,

and process ID of last process to attach or

detach on shared memory segments. See below.

-t Print time information: time of the last

control operation that changed the access

permissions for all facilities, time of last

msgsnd and last msgrcv on message queues,

time of last shmat and last shmdt on shared

memory, time of last semop on semaphores.

See below.

-C corefile Use the file corefile in place of ⁄dev⁄mem

and ⁄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.

-N namelist Use the file namelist in place of ⁄dev⁄ksyms.

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,

semget, or shmget 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 char-

acters are:

R A process is waiting on a msgrcv.

S A process is waiting on a msgsnd.

D The associated shared memory segment

has been removed. It will disappear

when the last process attached to

the segment detaches it.

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 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

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,c) The login name of the creator of the facil-

ity entry.

CGROUP (a,c) The group name of the group of the creator

of the facility entry.

CBYTES (a,o) The number of bytes in messages currently

outstanding on the associated message queue.

QNUM (a,o) The number of messages currently outstanding

on the associated message queue.

QBYTES (a,b) The maximum number of bytes allowed in mes-

sages outstanding on the associated message

queue.

LSPID (a,p) The process ID of the last process to send a

message to the associated queue.

LRPID (a,p) The process ID of the last process to

receive a message from the associated queue.

STIME (a,t) The time the last message was sent to the

associated queue.

RTIME (a,t) The time the last message was received from

the associated queue.

CTIME (a,t) The time when the associated entry was

created or changed.

NATTCH (a,o) The number of processes attached to the

associated shared memory segment.

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

segment.

CPID (a,p) The process ID of the creator of the shared

memory entry.

LPID (a,p) The process ID of the last process to attach

or detach the shared memory segment.

ATIME (a,t) The time the last attach was completed to

the associated shared memory segment.

DTIME (a,t) The time the last detach was completed on

the associated shared memory segment.

NSEMS (a,b) The number of semaphores in the set associ-

ated with the semaphore entry.

OTIME (a,t) The time the last semaphore operation was

completed on the set associated with the

semaphore entry.

FILES

⁄etc⁄group group names

⁄etc⁄passwd user names

⁄dev⁄mem memory

⁄dev⁄ksyms system namelist