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120 lines
4.2 KiB
Groff
120 lines
4.2 KiB
Groff
.\" Copyright (c) 2021 Fernando Apesteguia <fernape@FreeBSD.org>
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice(s), this list of conditions and the following disclaimer as
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.\" the first lines of this file unmodified other than the possible
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.\" addition of one or more copyright notices.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice(s), this list of conditions and the following disclaimer in
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.\" the documentation and/or other materials provided with the
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.\" distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY
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.\" EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE
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.\" LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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.\" BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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.\" WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
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.\" OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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.\" EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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.\"
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.\" Portions of this text are reprinted and reproduced in electronic form
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.\" from IEEE Std 1003.1, 2004 Edition, Standard for Information Technology --
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.\" Portable Operating System Interface (POSIX), The Open Group Base
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.\" Specifications Issue 6, Copyright (C) 2001-2004 by the Institute of
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.\" Electrical and Electronics Engineers, Inc and The Open Group. In the
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.\" event of any discrepancy between this version and the original IEEE and
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.\" The Open Group Standard, the original IEEE and The Open Group Standard is
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.\" the referee document. The original Standard can be obtained online at
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.\" http://www.opengroup.org/unix/online.html.
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.\"
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.Dd February 15, 2021
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.Dt MQ_UNLINK 2
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.Os
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.Sh NAME
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.Nm mq_unlink
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.Nd "mq_unlink - remove a message queue (REALTIME)"
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.Sh LIBRARY
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.Lb librt
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.Sh SYNOPSIS
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.In mqueue.h
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.Ft int
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.Fn mq_unlink "const char *name"
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.Sh DESCRIPTION
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The
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.Fn mq_unlink
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function removes the message queue named by the string
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.Fa name .
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If one or more processes have the message queue open when
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.Fn mq_unlink
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is called, destruction of the message queue will be postponed
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until all references to the message queue have been closed.
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However, the
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.Fn mq_unlink
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call need not block until all references have been closed; it may return
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immediately.
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.Pp
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After a successful call to
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.Fn mq_unlink ,
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reuse of the name will subsequently cause
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.Xr mq_open 2
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to behave as if no message queue of this name exists.
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.Sh RETURN VALUES
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.Rv -std
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.Sh ERRORS
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The
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.Fn mq_unlink
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system call
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will fail if:
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.Bl -tag -width Er
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.It Bq Er EACCESS
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Permission is denied to unlink the message queue represented by
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.Fa name .
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.It Bq Er EINVAL
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.Fa name
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is invalid.
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.It Bq Er ENAMETOOLONG
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The length of the
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.Fa name
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argument exceeds
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.Brq Dv PATH_MAX
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or
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a pathname component is longer than
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.Brq Dv NAME_MAX .
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.It Bq Er ENOENT
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The message queue does not exist.
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.It Bq Er ENOSYS
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.Xr mqueuefs 4
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module is neither loaded nor included in the kernel.
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.El
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.Sh SEE ALSO
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.Xr mq_open 2
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.Sh STANDARDS
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The
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.Fn mq_unlink
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system call conforms to
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.St -p1003.1-2004 .
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The
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.Bq Er EACCESS
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error code is an extension to the standard.
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.Sh HISTORY
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Support for POSIX message queues first appeared in
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.Fx 7.0 .
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.Sh COPYRIGHT
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Portions of this text are reprinted and reproduced in electronic form
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from IEEE Std 1003.1, 2004 Edition, Standard for Information Technology --
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Portable Operating System Interface (POSIX), The Open Group Base
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Specifications Issue 6, Copyright (C) 2001-2004 by the Institute of
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Electrical and Electronics Engineers, Inc and The Open Group.
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In the event of any discrepancy between this version and the original IEEE and
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The Open Group Standard, the original IEEE and The Open Group Standard is
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the referee document.
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The original Standard can be obtained online at
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http://www.opengroup.org/unix/online.html.
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