mq_close()

Close a message queue

Synopsis:

#include <mqueue.h>

int mq_close( mqd_t mqdes );

Arguments:

mqdes

The message-queue descriptor, returned by mq_open(), of the message queue that you want to close.

Library:

• For the traditional implementation, libc

  Use the -l c option to qcc to link against this library. This library is usually included automatically.

• For the alternate implementation using asynchronous messages, libmq

  Use the -l mq option to qcc to link against this library.

Description:

The mq_close() function removes the association between mqdes and a message queue. If the current process attaches a notify to this queue for notification, the attachment is eliminated. If this queue is unlinked before the call to mq_close(), and this process is the last process to call mq_close() on the queue, then the queue is destroyed, along with its contents.

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Neutrino supports two implementations of message queues: a traditional implementation, and an alternate one that uses asynchronous messages. For more information, see the entry for mq and mqueue in the Utilities Reference.

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In the traditional (mqueue) implementation, calling close() with mqdes has the same effect as calling mq_close().

Returns:

-1 if an error occurred (errno is set). Any other value indicates success.

Errors:

EBADF

Invalid queue mqdes.

Classification:

POSIX 1003.1 MSG

See also:

mq_open(), mq_unlink()

mq, mqueue in the Utilities Reference