ipcs(1) manual page
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ipcs - report inter-process communication facilities status
ipcs
[ -abcmopqst ] [ -C corefile ] [ -N namelist ]
SUNWipc
ipcs prints information about active inter-process communication facilities.
Without options, information is printed in short format for message queues,
shared memory, and semaphores that are currently active in the system.
The
information that is displayed is controlled by the options supplied.
- -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 meaning 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 message 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
characters 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 facility 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 messages 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 associated with the semaphore entry.
- OTIME (a,t)
- The time the last semaphore operation was completed on the set
associated with the semaphore entry.
- /etc/group
- group names
- /etc/passwd
- user names
- /dev/mem
- memory
- /dev/ksyms
- system namelist
msgop(2)
,
semop(2)
, shmop(2)
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.
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