ipcrm
remove a message queue, semaphore set or shared memory id
see also :
ipcs - ipcmk
Synopsis
ipcrm [
-M key | -m id |
-Q key | -q id |
-S key | -s id ]
...
deprecated
usage
ipcrm
{shm|msg|sem} id...
add an example, a script, a trick and tips
examples
source
ipcrm -Q 70
ipcrm -Q 71
ipcrm -Q 72
ipcrm -Q 73
ipcrm -Q 74
ipcrm -Q 75
ipcrm -Q 76
source
ipcrm -S 0x61733713
ipcrm -M 0x61733713
make clean
make
export DEBUG=3
source
ipcrm -Q 0x5302
ipcrm -Q 0x5303
ipcrm -Q 0x5313
ipcrm -Q 0x5306
ipcrm -Q 0x5305
ipcrm -Q 0x5304
ipcrm -Q 0x5312
ipcrm -Q 0x5312
ipcrm -Q 0x5309
ipcrm -Q 0x5301
ipcrm -Q 0x5300
ipcrm -Q 0x5307
ipcrm -Q 0x5317
ipcrm -Q 0x5316
description
ipcrm
removes System V interprocess communication (IPC) objects
and associated data structures from the system. In order to
delete such objects, you must be superuser, or the creator
or owner of the object.
System V IPC
objects are of three types: shared memory, message queues,
and semaphores. Deletion of a message queue or semaphore
object is immediate (regardless of whether any process still
holds an IPC identifier for the object). A shared memory
object is only removed after all currently attached
processes have detached (shmdt(2)) the object from
their virtual address space.
Two syntax
styles are supported. The old Linux historical syntax
specifies a three letter keyword indicating which class of
object is to be deleted, followed by one or more IPC
identifiers for objects of this type.
The
SUS-compliant syntax allows the specification of zero or
more objects of all three types in a single command line,
with objects specified either by key or by identifier. (See
below.) Both keys and identifiers may be specified in
decimal, hexadecimal (specified with an initial
’0x’ or ’0X’), or octal (specified
with an initial ’0’).
options
-M
shmkey
removes the shared memory
segment created with shmkey after the last detach is
performed.
-m
shmid
removes the shared memory
segment identified by shmid after the last detach is
performed.
-Q
msgkey
removes the message queue
created with msgkey.
-q
msgid
removes the message queue
identified by msgid.
-S
semkey
removes the semaphore created
with semkey.
-s
semid
removes the semaphore
identified by semid.
The details of
the removes are described in msgctl(2),
shmctl(2), and semctl(2). The identifiers and
keys may be found by using ipcs(1).
availability
The ipcrm command is part of the util-linux package and is
available from ftp://ftp.kernel.org/pub/linux/utils/util-linux/.
notes
In its first Linux implementation, ipcrm used the deprecated
syntax shown in the SYNOPSIS. Functionality present in
other *nix implementations of ipcrm has since been added, namely
the ability to delete resources by key (not just identifier), and
to respect the same command-line syntax. For backward
compatibility the previous syntax is still supported.
see also
ipcs ,
ipcmk , msgctl, msgget,
semctl, semget, shmctl,
shmdt, shmget, ftok