January 5, 2009 MQ_CLOSE 3

### NAME

mq_close - close a message queue (REALTIME)

### LIBRARY

POSIX Real-time Library (librt, -lrt)

### SYNOPSIS

```int` mq_close(```mqd_t mqdes`)

### DESCRIPTION

The mq_close(``) function will remove the association between the message queue descriptor, ```mqdes`, and its message queue.

If the process has successfully attached a notification request to the message queue via this ```mqdes`, this attachment will be removed, and the message queue is available for another process to attach for notification.

### RETURN VALUES

### ERRORS

The mq_close(``) function fails if:

[```EBADF`]
  The ```mqdes` argument is not a valid message queue descriptor.

### SEE ALSO

mq_getattr(3), mq_notify(3), mq_open(3), mq_receive(3), mq_send(3), mq_setattr(3), mq_unlink(3)

### STANDARDS

This function conforms to the IEEE Std 1003.1-2001 (``POSIX.1'') standard.

### HISTORY

The mq_close(``) function first appeared in NetBSD5.0.

### 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 .