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Name

ipcrm - remove an XSI message queue, semaphore set, or shared memory segment identifier

Synopsis

ipcrm [ -q msgid | -Q msgkey | -s semid | -S semkey -m shmid | -M shmkey ] ...

Description

The ipcrm utility shall remove zero or more message queues, semaphore sets, or shared memory segments. The interprocess communication facilities to be removed are specified by the options.

Only a user with appropriate privilege shall be allowed to remove an interprocess communication facility that was not created by or owned by the user invoking ipcrm.

Options

The ipcrm facility supports the Base Definitions volume of IEEE Std 1003.1-2001, Section 12.2, Utility Syntax Guidelines.

The following options shall be supported:

-q
msgid Remove the message queue identifier msgid from the system and destroy the message queue and data structure associated with it.

-m
shmid Remove the shared memory identifier shmid from the system. The shared memory segment and data structure associated with it shall be destroyed after the last detach.

-s
semid Remove the semaphore identifier semid from the system and destroy the set of semaphores and data structure associated with it.

-Q
msgkey Remove the message queue identifier, created with key msgkey, from the system and destroy the message queue and data structure associated with it.

-M
shmkey Remove the shared memory identifier, created with key shmkey, from the system. The shared memory segment and data structure associated with it shall be destroyed after the last detach.

-S
semkey Remove the semaphore identifier, created with key semkey, from the system and destroy the set of semaphores and data structure associated with it.

Operands

None.

Stdin

Not used.

Input Files

None.

Environment Variables

The following environment variables shall affect the execution of ipcrm:

LANG Provide a default value for the internationalization variables that are unset or null. (See the Base Definitions volume of IEEE Std 1003.1-2001, Section 8.2, Internationalization Variables for the precedence of internationalization variables used to determine the values of locale categories.)

LC_ALL If set to a non-empty string value, override the values of all the other internationalization variables.

LC_CTYPE
Determine the locale for the interpretation of sequences of bytes of text data as characters (for example, single-byte as opposed to multi-byte characters in arguments).

LC_MESSAGES
Determine the locale that should be used to affect the format and contents of diagnostic messages written to standard error.

NLSPATH
Determine the location of message catalogs for the processing of LC_MESSAGES .

Asynchronous Events

Default.

Stdout

Not used.

Stderr

The standard error shall be used only for diagnostic messages.

Output Files

None.

Extended Description

None.

Exit Status

The following exit values shall be returned:

0
Successful completion.

>0
An error occurred.

Consequences of Errors

Default.

The following sections are informative.

Application Usage

None.

Examples

None.

Rationale

None.

Future Directions

None.

See Also

ipcs , the System Interfaces volume of IEEE Std 1003.1-2001, msgctl(), semctl(), shmctl()

Copyright

Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at http://www.opengroup.org/unix/online.html .

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