03-31-2008
ipcs shows your sysv ipc id's, etc..Otherwise as Jim noted.
If I understand correctly: We all have this problem when testing code sometimes.
Without a signal handler that cleans up the allocated shared memory segment
on a user interrupt you are stuck with manually removing the segment.
This is especially painful when the id is hardcoded and IPC_EXCL is specified or when you run into a sysv ipc limit maximum.
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IPCRM(1) Linux Programmer's Manual IPCRM(1)
NAME
ipcrm - remove a message queue, semaphore set or shared memory id
SYNOPSIS
ipcrm [ -M key | -m id | -Q key | -q id | -S key | -s id ] ...
deprecated usage
ipcrm {shm|msg|sem} id...
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 speci-
fied 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).
NOTES
In its first Linux implementation, ipcrm used the deprecated syntax shown in the SYNOPSIS. Functionality present in other *nix implementa-
tions 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(1), ipcmk(1), msgctl(2), msgget(2), semctl(2), semget(2), shmctl(2), shmdt(2), shmget(2), ftok(3)
AVAILABILITY
The ipcrm command is part of the util-linux-ng package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux-ng/.
ipcrm last change: 19 March 2002 IPCRM(1)