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

\fBint\fR \fBmq_unlink\fR(\fBconst char *\fR\fIname\fR);
.fi

.SH DESCRIPTION
.sp
.LP
The \fBmq_unlink()\fR function removes the message queue named by the pathname
\fIname\fR. After a successful call to \fBmq_unlink()\fR with \fIname\fR, a
call to \fBmq_open\fR(3C) with \fIname\fR fails if the flag \fBO_CREAT\fR is
not set in \fIflags\fR. If one or more processes have the message queue open
when \fBmq_unlink()\fR is called, destruction of the message queue is postponed
until all references to the message queue have been closed. Calls to
\fBmq_open\fR(3C) to re-create the message queue may fail until the message
queue is actually removed. However, the \fBmq_unlink()\fR call need not block
until all references have been closed; it may return immediately.
.SH RETURN VALUES
.sp
.LP
Upon successful completion, \fBmq_unlink()\fR returns \fB0\fR; otherwise, the
named message queue is not changed by this function call, the function returns
\fB\(mi1\fR and sets \fBerrno\fR to indicate the error.
.SH ERRORS
.sp
.LP
The  \fBmq_unlink()\fR function will fail if:
.sp
.ne 2
.na
\fB\fBEACCES\fR \fR
.ad
.RS 17n
Permission is denied to unlink the named message queue.
.RE

.sp
.ne 2
.na
\fB\fBENAMETOOLONG\fR \fR
.ad
.RS 17n
The length of the \fIname\fR string exceeds  \fBPATH_MAX\fR, or a pathname
component is longer than  \fINAME_MAX\fR while  \fB_POSIX_NO_TRUNC\fR is in
effect.
.RE

.sp
.ne 2
.na
\fB\fBENOENT\fR \fR
.ad
.RS 17n
The named message queue, \fIname\fR, does not exist.
.RE

.sp
.ne 2
.na
\fB\fBENOSYS\fR \fR
.ad
.RS 17n
\fBmq_unlink()\fR 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_close (3C),
.BR mq_open (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.