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.TH MQ_CLOSE 3C "Feb 5, 2008"
.SH NAME
mq_close \- close a message queue
.SH SYNOPSIS
.LP
.nf
#include <mqueue.h>

\fBint\fR \fBmq_close\fR(\fBmqd_t\fR \fImqdes\fR);
.fi

.SH DESCRIPTION
.sp
.LP
The \fBmq_close()\fR function removes the association between the message queue
descriptor, \fImqdes\fR, and its message queue. The results of using this
message queue descriptor after successful return from this \fBmq_close()\fR,
and until the return of this message queue descriptor from a subsequent
\fBmq_open\fR(3C), are undefined.
.sp
.LP
If the process (or thread) has successfully attached a notification request to
the message queue via this \fImqdes\fR, this attachment is removed and the
message queue is available for another process to attach for notification.
.SH RETURN VALUES
.sp
.LP
Upon successful completion, \fBmq_close()\fR returns \fB0\fR; otherwise, the
function returns \fB\(mi1\fR and sets \fBerrno\fR to indicate the error
condition.
.SH ERRORS
.sp
.LP
The  \fBmq_close()\fR function will fail if:
.sp
.ne 2
.na
\fB\fBEBADF\fR \fR
.ad
.RS 11n
The \fImqdes\fR argument is an invalid message queue descriptor.
.RE

.sp
.ne 2
.na
\fB\fBENOSYS\fR \fR
.ad
.RS 11n
The \fBmq_open()\fR function is not supported by the system.
.RE

.SH ATTRIBUTES
.sp
.LP
See \fBattributes\fR(7) for descriptions of the following attributes:
.sp

.sp
.TS
box;
c | c
l | l .
ATTRIBUTE TYPE	ATTRIBUTE VALUE
_
Interface Stability	Committed
_
MT-Level	MT-Safe
_
Standard	See \fBstandards\fR(7).
.TE

.SH SEE ALSO
.sp
.LP
.BR mq_notify (3C),
.BR mq_open (3C),
.BR mq_unlink (3C),
.BR mqueue.h (3HEAD),
.BR attributes (7),
.BR standards (7)
.SH NOTES
.sp
.LP
Solaris 2.6 was the first release to support the Asynchronous Input and Output
option. Prior to this release, this function always returned \fB\(mi1\fR and
set \fBerrno\fR to \fBENOSYS\fR.