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ipcrm(1) [freebsd man page]

IPCRM(1)						    BSD General Commands Manual 						  IPCRM(1)

NAME
ipcrm -- remove the specified message queues, semaphore sets, and shared segments SYNOPSIS
ipcrm [-W] [-v] [-q msqid] [-m shmid] [-s semid] [-Q msgkey] [-M shmkey] [-S semkey] ... 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 run- ning 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. BSD
December 12, 2007 BSD

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IPCRM(1)							   User Commands							  IPCRM(1)

NAME
ipcrm - remove certain IPC resources SYNOPSIS
ipcrm [options] ipcrm {shm|msg|sem} id... DESCRIPTION
ipcrm removes System V inter-process 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'). The details of the removes are described in shmctl(2), msgctl(2), and semctl(2). The identifiers and keys can be found by using ipcs(1). OPTIONS
-a, --all [shm] [msg] [sem] Remove all resources. When an option argument is provided, the removal is performed only for the specified resource types. Warn- ing! Do not use -a if you are unsure how the software using the resources might react to missing objects. Some programs create these resources at startup and may not have any code to deal with an unexpected disappearance. -M, --shmem-key shmkey Remove the shared memory segment created with shmkey after the last detach is performed. -m, --shmem-id shmid Remove the shared memory segment identified by shmid after the last detach is performed. -Q, --queue-key msgkey Remove the message queue created with msgkey. -q, --queue-id msgid Remove the message queue identified by msgid. -S, --semaphore-key semkey Remove the semaphore created with semkey. -s, --semaphore-id semid Remove the semaphore identified by semid. -V, --version Display version information and exit. -h, --help Display help text and exit. NOTES
In its first Linux implementation, ipcrm used the deprecated syntax shown in the second line of 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
ipcmk(1), ipcs(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 package and is available from Linux Kernel Archive <https://www.kernel.org/pub/linux/utils /util-linux/>. util-linux July 2014 IPCRM(1)
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