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+.\" $NetBSD: linedisc.9,v 1.12 2024/09/07 19:13:29 rillig Exp $
+.\"
+.\" Copyright (c) 2000 Christopher G. Demetriou.
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. All advertising materials mentioning features or use of this software
+.\"    must display the following acknowledgement:
+.\"          This product includes software developed for the
+.\"          NetBSD Project.  See https://www.NetBSD.org/ for
+.\"          information about NetBSD.
+.\" 4. The name of the author may not be used to endorse or promote products
+.\"    derived from this software without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+.\"
+.\" --(license Id: LICENSE.proto,v 1.1 2000/06/13 21:40:26 cgd Exp )--
+.\"
+.Dd November 1, 2000
+.Dt LINEDISC 9
+.Os
+.Sh NAME
+.Nm linedisc ,
+.Nm ttyldisc_add ,
+.Nm ttyldisc_lookup ,
+.Nm ttyldisc_remove
+.Nd extensible line discipline framework
+.Sh SYNOPSIS
+.In sys/conf.h
+.Ft int
+.Fn ttyldisc_add "struct linesw *disc" "int no"
+.Ft struct linesw *
+.Fn ttyldisc_remove "const char *name"
+.Ft struct linesw *
+.Fn ttyldisc_lookup "const char *name"
+.Sh DESCRIPTION
+The
+.Nx
+TTY line discipline framework allows extensibility.
+Modules that need special line disciplines can add
+them as convenient and do not need to modify tty_conf.c.
+Line disciplines are now managed by a string, rather than
+number.
+.Pp
+Once the framework has been initialized, a new line
+discipline can be added by creating and initializing a
+.Fa struct linesw
+and calling
+.Fn ttyldisc_add .
+.Pp
+The following is a brief description of each function in the framework:
+.Bl -tag -width "ttyldisc_remove()"
+.It Fn ttyldisc_add
+Register a line discipline.
+The
+.Fa l_name
+field of the
+.Fa struct linesw
+should point to a string which is to be the symbolic
+name of that line discipline.
+For compatibility purposes, a line discipline number can be passed in
+.Fa no ,
+but for new disciplines this should be set to
+.Dv -1 .
+.It Fn ttyldisc_lookup
+Look up a line discipline by
+.Fa name .
+.Dv NULL
+is returned if it can not be found.
+.It Fn ttyldisc_remove
+Remove a line discipline called
+.Fa name
+and return a pointer to it.
+If the discipline cannot be found or removed
+.Fn ttyldisc_remove
+will return
+.Dv NULL .
+.El
+.Sh SEE ALSO
+.Xr tty 4
+.Sh HISTORY
+The
+.Nm
+functions were added in
+.Nx 1.6 .
+.Sh AUTHORS
+The
+.Nx
+extensible line discipline framework was created by
+.An Eduardo Horvath
+.Aq eeh@NetBSD.org .