NAME

ipcrm — remove the specified message queues, semaphore sets, and shared segments

SYNOPSIS

DESCRIPTION

The ipcrm utility removes the specified message queues, semaphores and shared memory segments. These System V IPC objects can be specified by their creation ID or any associated key.

The following options are generic:

-v

If specified once with -W or with -1 for an object, it will show all removed objects. If specified twice with -W or with -1 for an objects, it will show all removed objects and all failed removals.

-W

Try to wipe all specified message queues, semaphores and shared memory segments.

-y

Use the kvm(3) interface instead of the sysctl(3) interface to extract the required information. If ipcrm is to operate on the running system, using kvm(3) will require read privileges to /dev/kmem.

The following options are used to specify which IPC objects will be removed. Any number and combination of these options can be used:

-q msqid

Remove the message queue associated with the ID msqid from the system.

-m shmid

Mark the shared memory segment associated with ID shmid for removal. This marked segment will be destroyed after the last detach.

-s semid

Remove the semaphore set associated with ID semid from the system.

-Q msgkey

Remove the message queue associated with key msgkey from the system.

-M shmkey

Mark the shared memory segment associated with key shmkey for removal. This marked segment will be destroyed after the last detach.

-S semkey

Remove the semaphore set associated with key semkey from the system.

The identifiers and keys associated with these System V IPC objects can be determined by using ipcs(1). If the identifier or the key is -1, it will remove all these objects.

SEE ALSO

ipcs(1)

HISTORY

The wiping of all System V IPC objects was first implemented in FreeBSD 6.4 and 7.1.

AUTHORS

The original author was Adam Glass. The wiping of all System V IPC objects was thought up by
Callum Gibson and extended and implemented by
Edwin Groothuis.