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.Dd November 29, 2005
.Dt MQ_CLOSE 2
.Os
.Sh NAME
.Nm mq_close
.Nd "close a message queue (REALTIME)"
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In mqueue.h
.Ft int
.Fn mq_close "mqd_t mqdes"
.Sh DESCRIPTION
The
.Fn mq_close
system call removes the association between the message queue descriptor,
.Fa mqdes ,
and its message queue.
The results of using this message queue descriptor
after successful return from this
.Fn mq_close ,
and until the return of this message queue descriptor from a subsequent
.Fn mq_open ,
are undefined.
.Pp
If the process has successfully attached a notification request to the
message queue via this
.Fa mqdes ,
this attachment will be removed, and the message queue is available for
another process to attach for notification.
.Sh RETURN VALUES
.Rv -std
.Sh ERRORS
The
.Fn mq_close
system call
will fail if:
.Bl -tag -width Er
.It Bq Er EBADF
The
.Fa mqdes
argument is not a valid message queue descriptor.
.El
.Sh SEE ALSO
.Xr mq_open 2 ,
.Xr mq_unlink 2
.Sh STANDARDS
The
.Fn mq_close
system call conforms to
.St -p1003.1-2004 .
.Sh HISTORY
Support for
.Tn POSIX
message queues first appeared in
.Fx 7.0 .