124 lines
4.0 KiB
Groff
124 lines
4.0 KiB
Groff
.\" Copyright (c) 2001-2002 Maksim Yevmenkin <m_evmenkin@yahoo.com>
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.\" All rights reserved.
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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, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $Id: ng_h4.4,v 1.2 2003/05/21 19:37:35 max Exp $
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.\" $FreeBSD$
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.\"
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.Dd June 14, 2002
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.Dt NG_H4 4
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.Os
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.Sh NAME
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.Nm ng_h4
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.Nd Netgraph node type that is also an H4 line discipline
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.Sh SYNOPSIS
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.In sys/types.h
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.In netgraph/bluetooth/include/ng_h4.h
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.Sh DESCRIPTION
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The
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.Nm h4
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node type is both a persistent Netgraph node type and a H4 line
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discipline.
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It implements a Bluetooth HCI UART transport layer as
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per chapter H4 of the Bluetooth Specification Book v1.1.
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A new node is created when the corresponding line discipline,
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.Dv H4DISC ,
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is registered on a tty device (see
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.Xr tty 4 ) .
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.Pp
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The node has a single hook called
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.Dv hook .
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Incoming bytes received on the tty device are re-assembled into
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HCI frames (according to the length).
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Full HCI frames are sent out on the hook.
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HCI frames received on
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.Dv hook
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are transmitted out on the tty device.
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No modification to the data is performed in either direction.
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While the line discipline is installed on a tty, the normal
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read and write operations are unavailable, returning
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.Er EIO .
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.Pp
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Information about the node is available via the netgraph
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.Xr ioctl 2
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command
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.Dv NGIOCGINFO .
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This command returns a
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.Vt "struct nodeinfo"
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similar to the
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.Dv NGM_NODEINFO
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.Xr netgraph 4
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control message.
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.Sh HOOKS
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This node type supports the following hooks:
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.Bl -tag -width ".Va hook"
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.It Va hook
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single HCI frame contained in single
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.Vt mbuf
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structure.
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.El
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.Sh CONTROL MESSAGES
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This node type supports the generic control messages, plus the following:
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.Bl -tag -width foo
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.It Dv NGM_H4_NODE_RESET
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Reset the node.
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.It Dv NGM_H4_NODE_GET_STATE
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Returns current receiving state for the node.
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.It Dv NGM_H4_NODE_GET_DEBUG
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Returns an integer containing the current debug level for the node.
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.It Dv NGM_H4_NODE_SET_DEBUG
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This command takes an integer argument and sets current debug level
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for the node.
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.It Dv NGM_H4_NODE_GET_QLEN
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Returns current length of outgoing queue for the node.
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.It Dv NGM_H4_NODE_SET_QLEN
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This command takes an integer argument and sets maximum length of
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outgoing queue for the node.
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.It Dv NGM_H4_NODE_GET_STAT
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Returns various statistic information for the node, such as: number of
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bytes (frames) sent, number of bytes (frames) received and number of
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input (output) errors.
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.It Dv NGM_H4_NODE_RESET_STAT
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Reset all statistic counters to zero.
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.El
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.Sh SHUTDOWN
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This node shuts down when the corresponding device is closed
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(or the line discipline is uninstalled on the device).
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.Sh SEE ALSO
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.Xr ioctl 2 ,
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.Xr netgraph 4 ,
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.Xr tty 4 ,
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.Xr ngctl 8
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.Sh HISTORY
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The
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.Nm h4
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node type was implemented in
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.Fx 5.0 .
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.Sh AUTHORS
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.An Maksim Yevmenkin Aq m_evmenkin@yahoo.com
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.Sh BUGS
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This node still uses
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.Xr spltty 9
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to lock tty layer.
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This is wrong.
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