266 lines
8.5 KiB
Groff
266 lines
8.5 KiB
Groff
.\" $NetBSD: wscons.4,v 1.9 1999/07/29 18:22:04 augustss Exp $
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.\"
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.\" Copyright (c) 1999 The NetBSD Foundation, Inc.
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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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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the NetBSD
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.\" Foundation, Inc. and its contributors.
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.\" 4. Neither the name of The NetBSD Foundation nor the names of its
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.\" contributors may be used to endorse or promote products derived
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.\" from this software without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.\" BE 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 BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd July 26, 1998
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.Dt WSCONS 4
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.Os
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.Sh NAME
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.Nm wscons
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.Nd console access
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.Sh SYNOPSIS
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.Cd options WSEMUL_SUN
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.Cd options WSEMUL_VT100
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.Cd options WSEMUL_NO_DUMB
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.Cd options \&"WSEMUL_DEFAULT=\e"xxx\e""
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.Cd options WS_KERNEL_FG=WSCOL_XXX
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.Cd options WS_KERNEL_BG=WSCOL_XXX
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.Cd options WSDISPLAY_COMPAT_PCVT
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.Cd options WSDISPLAY_COMPAT_SYSCONS
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.Cd options WSDISPLAY_COMPAT_USL
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.Cd options WSDISPLAY_COMPAT_RAWKBD
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.Cd "wsdisplay* at ..."
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.Cd "wskbd* at ... mux N"
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.Cd "wsmouse* at ... mux N"
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.Cd pseudo-device wsmux N
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.Pp
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.Sh DESCRIPTION
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The
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.Nm
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driver provides support for machine independent access to the console.
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.Pp
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.Nm
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is made of a number of cooperating modules, in particular
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.Bl -bullet
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.It
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hardware support for display adapters, keyboards and mice, see
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.Xr wsdisplay 4 ,
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.Xr wskbd 4 , and
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.Xr wsmouse 4
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.It
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input event multiplexor, see
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.Xr wsmux 4
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.It
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terminal emulation modules (see below), and
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.It
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compatibility options to support control operations and other low-level
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behaviour of existing terminal drivers (see below)
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.El
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.Pp
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.Em Terminal emulations:
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.Nm
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does not define an own set of terminal control sequences and special keyboard
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codes in terms of
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.Xr termcap 5 .
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Instead a
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.Dq terminal emulation
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is assigned to each virtual screen when the screen is created (see
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.Xr wsconscfg 8 ).
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Different terminal emulations can be active at the same time on one display.
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The following choices are available:
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.Bl -tag -width xxxxxx
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.It dumb
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This minimal terminal support is available unless the kernel option
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.Cd options WSEMUL_NO_DUMB
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was specified at build time. No control sequences are supported besides
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the ASCII control characters. The cursor is not addressable. Only ASCII
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keyboard codes will be delivered, cursor and functions keys do not work.
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.It sun
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The
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.Dq sun
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console emulation is available if
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.Cd options WSEMUL_SUN
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was specified at kernel build time. It supports the control sequences of
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.Tn SUN
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machine consoles and delivers its keyboard codes for function and
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keypad keys (as far as present on the actually used keyboard).
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This emulation is sufficient for full-screen applications.
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.It vt100
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is available with the kernel compile option
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.Cd options WSEMUL_VT100 .
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It provides the most commonly used functions of
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.Tn DEC VT100
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terminals with some extensions introduced by the
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.Tn DEC VT220
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and
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.Tn DEC VT320
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models. The features of the original
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.Tn VT100
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which are not or not completely implemented are:
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.Bl -bullet
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.It
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.Tn VT52
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support, 132-column-mode, smooth scroll, light background, keyboard
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autorepeat control, external printer support, keyboard locking,
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newline/linefeed switching: Escape sequences related
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to these features are ignored or answered with standard replies.
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(DECANM, DECCOLM, DECSCLM, DECSCNM, DECARM, DECPFF, DECPEX, KAM, LNM)
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.It
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Function keys are not reprogrammable and fonts can not be downloaded.
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DECUDK and DECDLD sequences will be ignored.
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.It
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Neither C1 control set characters will be recognized nor will 8-bit keyboard
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codes be delivered.
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.It
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The
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.Dq DEC supplemental graphic
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font is approximated by the ISO-latin-1 font, though there are
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subtle differences.
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.It
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The actual rendering quality depends on the underlying graphics hardware
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driver. Characters might be missing in the available fonts and be
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substituted by more or less fitting replacements.
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.Pp
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Depending on the keyboard used, not all function keys might be available.
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.El
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.Pp
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In addition to the plain
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.Tn VT100
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functions are supported:
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.Bl -bullet
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.It
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ANSI colors
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.It
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Some
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.Tn VT220
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-like presentation state settings and -reports (DECRSPS), especially
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tabulator settings.
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.El
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.Pp
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In most applications,
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.Nm
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will work sufficiently as a
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.Tn VT220
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emulator.
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.El
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.Pp
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The
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.Va WSEMUL_DEFAULT
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kernel option allows to select one of the described terminal options
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as default choice. The default gets into effect in kernel startup, i.e.
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for the operating system console or additional screens allocated
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through the
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.Va WSDISPLAY_DEFAULTSCREENS
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option (see
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.Xr wsdisplay 4
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), or if no emulation type was passed to the
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.Xr wsconscfg 8
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utility.
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.Pp
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.Em Compatibility options:
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these options allow to run X servers or other programs using low-level
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console driver functions which were written specifically for other
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console drivers to run on
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.Nx
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systems. The options are in particular:
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.Bl -tag -width xxxxxxxx
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.It Cd WSDISPLAY_COMPAT_USL
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Support the protocol for switches between multiple virtual screens on
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one display as used by most PC-UNIX variants.
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.It Cd WSDISPLAY_COMPAT_RAWKBD
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Allows to get raw XT keyboard scancodes from PC keyboards as needed
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by i386 X servers.
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.It Cd WSDISPLAY_COMPAT_PCVT
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Emulates enough of the
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.Nx
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/ i386
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.Dq pcvt
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driver to make X servers work.
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.It Cd WSDISPLAY_COMPAT_SYSCONS
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Emulates enough of the i386 FreeBSD
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.Dq syscons
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driver to make X servers work. Useful with FreeBSD binary emulation.
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.El
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.Pp
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Linux/i386 X servers do usually run if the first two options are
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enabled together with the
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.Nx
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Linux binary emulation.
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.Pp
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(To have programs looking for device special files of other console drivers
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find the
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.Nm
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driver entry points, symlinks are a helpful measure.)
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.Pp
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.Em Other options:
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.Bl -tag -width xxxxxxxx
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.It Cd options WS_KERNEL_FG=WSCOL_XXX ,
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.It Cd options WS_KERNEL_BG=WSCOL_XXX ,
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.It Cd options \&WS_KERNEL_COLATTR="(WSATTR_XXX | WSATTR_YYY)"
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and
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.It Cd options \&WS_KERNEL_MONOATTR="(WSATTR_XXX | WSATTR_YYY)"
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allow to make console output originating from the kernel appear differently
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than output from user level programs (via
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.Pa /dev/console
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or the specific tty
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device like
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.Pa /dev/ttyE0
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).
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.Dq WS_KERNEL_FG
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and
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.Dq WS_KERNEL_BG
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set the foreground / background used on color displays. The
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.Dq WSCOL_XXX
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arguments are colors as defined in
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.Pa /usr/include/wscons/wsdisplayvar.h .
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.Dq WS_KERNEL_COLATTR
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and
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.Dq WS_KERNEL_MONOATTR
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are additional attribute flags used on color resp. monochrome displays,
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the arguments are defined in the same header file. Whether the attributes
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are supported or not depends on the actually used graphics adapter.
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These options are ignored by the
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.Dq dumb
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terminal emulation.
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.It Cd options WSCOMPAT_USL_SYNCTIMEOUT=nnn
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The virtual screen switching protocol enabled by
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.Dq WSDISPLAY_COMPAT_USL
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uses a somewhat complex handshake protocol to pass control to user programs
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as X servers controlling a virtual screen. To avoid a non-responsive
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application to lock the whole console system a screen switch will be rolled
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back if the user application does not respond to a screen switch request
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within some time. This option allows to set this timeout (in seconds),
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the default value is 5 seconds.
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.El
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.Sh BUGS
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This man page is still extremely incomplete.
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.Sh SEE ALSO
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.Xr wsdisplay 4 ,
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.Xr wskbd 4 ,
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.Xr wsmouse 4 ,
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.Xr wsmux 4 ,
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.Xr wsconscfg 8 ,
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.Xr wsconsctl 8 ,
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.Xr wsfontload 8
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