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freebsd-skq/usr.sbin/vidcontrol/vidcontrol.1
Edward Tomasz Napierala 449d10e56e Add "vidcontrol -i active", to print out active vty number, 
to be used with eg "vidcontrol -s".

Reviewed by:	emaste@
MFC after:	1 month
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D4968
2016-01-19 13:09:20 +00:00

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.\"
.\" vidcontrol - a utility for manipulating the syscons or vt video driver
.\"
.\" 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.
.\"
.\" @(#)vidcontrol.1
.\" $FreeBSD$
.\"
.Dd January 19, 2016
.Dt VIDCONTROL 1
.Os
.Sh NAME
.Nm vidcontrol
.Nd system console control and configuration utility
.Sh SYNOPSIS
.Nm
.Op Fl CdLHPpx
.Op Fl b Ar color
.Op Fl c Ar appearance
.Oo
.Fl f
.Oo
.Op Ar size
.Ar file
.Oc
.Oc
.Op Fl g Ar geometry
.Op Fl h Ar size
.Op Fl i Cm active | adapter | mode
.Op Fl l Ar screen_map
.Op Fl M Ar char
.Op Fl m Cm on | off
.Op Fl r Ar foreground Ar background
.Op Fl S Cm on | off
.Op Fl s Ar number
.Op Fl T Cm xterm | cons25
.Op Fl t Ar N | Cm off
.Op Ar mode
.Op Ar foreground Op Ar background
.Op Cm show
.Sh DESCRIPTION
The
.Nm
utility is used to set various options for the
.Xr syscons 4
or
.Xr vt 4
console driver,
such as video mode, colors, cursor shape, screen output map, font and screen
saver timeout.
Only a small subset of options is supported by
.Xr vt 4 .
Unsupported options lead to error messages, typically including
the text "Inappropriate ioctl for device".
.Pp
The following command line options are supported:
.Bl -tag -width indent
.It Ar mode
Select a new video mode.
The modes currently recognized are:
.Ar 80x25 ,
.Ar 80x30 ,
.Ar 80x43 ,
.Ar 80x50 ,
.Ar 80x60 ,
.Ar 132x25 ,
.Ar 132x30 ,
.Ar 132x43 ,
.Ar 132x50 ,
.Ar 132x60 ,
.Ar VGA_40x25 ,
.Ar VGA_80x25 ,
.Ar VGA_80x30 ,
.Ar VGA_80x50 ,
.Ar VGA_80x60 ,
.Ar VGA_90x25 ,
.Ar VGA_90x30 ,
.Ar VGA_90x43 ,
.Ar VGA_90x50 ,
.Ar VGA_90x60 ,
.Ar EGA_80x25 ,
.Ar EGA_80x43 ,
.Ar VESA_132x25 ,
.Ar VESA_132x43 ,
.Ar VESA_132x50 ,
.Ar VESA_132x60 .
.\"The graphic mode
.\".Ar VGA_320x200
.\"and
The raster text mode
.Ar VESA_800x600
can also be chosen.
Alternatively, a mode can be specified with its number by using a mode name of
the form
.Li MODE_ Ns Aq Ar NUMBER .
A list of valid mode numbers can be obtained with the
.Fl i Cm mode
option.
See
.Sx Video Mode Support
below.
.It Ar foreground Op Ar background
Change colors when displaying text.
Specify the foreground color
(e.g.\&
.Dq vidcontrol white ) ,
or both a foreground and background colors
(e.g.\&
.Dq vidcontrol yellow blue ) .
Use the
.Cm show
command below to see available colors.
.It Cm show
See the supported colors on a given platform.
.It Fl b Ar color
Set border color to
.Ar color .
This option may not be always supported by the video driver.
.It Fl C
Clear the history buffer.
.It Fl c Cm normal | blink | destructive
Change the cursor appearance.
The cursor is either an inverting block
.Pq Cm normal
that can optionally
.Cm blink ,
or it can be like the old hardware cursor
.Pq Cm destructive .
The latter is actually a simulation.
.It Fl d
Print out current output screen map.
.It Xo
.Fl f
.Oo
.Op Ar size
.Ar file
.Oc
.Xc
Load font
.Ar file
for
.Ar size
(currently, only
.Cm 8x8 ,
.Cm 8x14
or
.Cm 8x16 ) .
The font file can be either uuencoded or in raw binary format.
You can also use the menu-driven
.Xr vidfont 1
command to load the font of your choice.
.Pp
.Ar Size
may be omitted, in this case
.Nm
will try to guess it from the size of font file.
.Pp
When using
.Xr vt 4
both
.Ar size
and
.Ar font
can be omitted, and the default font will be loaded.
.Pp
Note that older video cards, such as MDA and CGA, do not support
software font.
See also
.Sx Video Mode Support
and
.Sx EXAMPLES
below and the man page for either
.Xr syscons 4
or
.Xr vt 4
(depending on which driver you use).
.It Fl g Ar geometry
Set the
.Ar geometry
of the text mode for the modes with selectable
geometry.
Currently only raster modes, such as
.Ar VESA_800x600 ,
support this option.
See also
.Sx Video Mode Support
and
.Sx EXAMPLES
below.
.It Fl h Ar size
Set the size of the history (scrollback) buffer to
.Ar size
lines.
.It Fl i Cm active
Shows the active vty number.
.It Fl i Cm adapter
Shows info about the current video adapter.
.It Fl i Cm mode
Shows the possible video modes with the current video hardware.
.It Fl l Ar screen_map
Install screen output map file from
.Ar screen_map .
See also
.Xr syscons 4
or
.Xr vt 4
(depending on which driver you use).
.It Fl L
Install default screen output map.
.It Fl M Ar char
Sets the base character used to render the mouse pointer to
.Ar char .
.It Fl m Cm on | off
Switch the mouse pointer
.Cm on
or
.Cm off .
Used together with the
.Xr moused 8
daemon for text mode cut & paste functionality.
.It Fl p
Capture the current contents of the video buffer corresponding
to the terminal device referred to by standard input.
The
.Nm
utility writes contents of the video buffer to the standard
output in a raw binary format.
For details about that
format see
.Sx Format of Video Buffer Dump
below.
.It Fl P
Same as
.Fl p ,
but dump contents of the video buffer in a plain text format
ignoring nonprintable characters and information about text
attributes.
.It Fl H
When used with
.Fl p
or
.Fl P ,
it instructs
.Nm
to dump full history buffer instead of visible portion of
the video buffer only.
.It Fl r Ar foreground background
Change reverse mode colors to
.Ar foreground
and
.Ar background .
.It Fl S Cm on | off
Turn vty switching on or off.
When vty switching is off,
attempts to switch to a different virtual terminal will fail.
(The default is to permit vty switching.)
This protection can be easily bypassed when the kernel is compiled with
the
.Dv DDB
option.
However, you probably should not compile the kernel debugger on a box which
is supposed to be physically secure.
.It Fl s Ar number
Set the active vty to
.Ar number .
.It Fl T Cm xterm | cons25
Switch between xterm and cons25 style terminal emulation.
.It Fl t Ar N | Cm off
Set the screensaver timeout to
.Ar N
seconds, or turns it
.Cm off .
.It Fl x
Use hexadecimal digits for output.
.El
.Ss Video Mode Support
Note that not all modes listed above may be supported by the video
hardware.
You can verify which mode is supported by the video hardware, using the
.Fl i Cm mode
option.
.Pp
The VESA BIOS support must be linked to the kernel
or loaded as a KLD module if you wish to use VESA video modes
or 132 column modes
(see
.Xr vga 4 ) .
.Pp
You need to compile your kernel with the
.Ar VGA_WIDTH90
option if you wish to use VGA 90 column modes
(see
.Xr vga 4 ) .
.Pp
Video modes other than 25 and 30 line modes may require specific size of font.
Use
.Fl f
option above to load a font file to the kernel.
If the required size of font has not been loaded to the kernel,
.Nm
will fail if the user attempts to set a new video mode.
.Pp
.Bl -column "25 line modes" "8x16 (VGA), 8x14 (EGA)" -compact
.Sy Modes Ta Sy Font size
.No 25 line modes Ta 8x16 (VGA), 8x14 (EGA)
.No 30 line modes Ta 8x16
.No 43 line modes Ta 8x8
.No 50 line modes Ta 8x8
.No 60 line modes Ta 8x8
.El
.Pp
It is better to always load all three sizes (8x8, 8x14 and 8x16)
of the same font.
.Pp
You may set variables in
.Pa /etc/rc.conf
or
.Pa /etc/rc.conf.local
so that desired font files will be automatically loaded
when the system starts up.
See below.
.Pp
If you want to use any of the raster text modes you need to recompile your
kernel with the
.Dv SC_PIXEL_MODE
option.
See
.Xr syscons 4
or
.Xr vt 4
(depending on which driver you use)
for more details on this kernel option.
.Ss Format of Video Buffer Dump
The
.Nm
utility uses the
.Xr syscons 4
.\" is it supported on vt(4)???
or
.Xr vt 4
.Dv CONS_SCRSHOT
.Xr ioctl 2
to capture the current contents of the video buffer.
The
.Nm
utility writes version and additional information to the standard
output, followed by the contents of the video buffer.
.Pp
VGA video memory is typically arranged in two byte tuples,
one per character position.
In each tuple, the first byte will be the character code,
and the second byte is the character's color attribute.
.Pp
The VGA color attribute byte looks like this:
.Bl -column "X:X" "<00000000>" "width" "bright foreground color"
.Sy "bits# width meaning"
.Li "7 <X0000000> 1 character blinking"
.Li "6:4 <0XXX0000> 3 background color"
.Li "3 <0000X000> 1 bright foreground color"
.Li "2:0 <00000XXX> 3 foreground color"
.El
.Pp
Here is a list of the three bit wide base colors:
.Pp
.Bl -hang -offset indent -compact
.It 0
Black
.It 1
Blue
.It 2
Green
.It 3
Cyan
.It 4
Red
.It 5
Magenta
.It 6
Brown
.It 7
Light Grey
.El
.Pp
Base colors with bit 3 (the bright foreground flag) set:
.Pp
.Bl -hang -offset indent -compact
.It 0
Dark Grey
.It 1
Light Blue
.It 2
Light Green
.It 3
Light Cyan
.It 4
Light Red
.It 5
Light Magenta
.It 6
Yellow
.It 7
White
.El
.Pp
For example, the two bytes
.Pp
.Dl "65 158"
.Pp
specify an uppercase A (character code 65), blinking
(bit 7 set) in yellow (bits 3:0) on a blue background
(bits 6:4).
.Pp
The
.Nm
output contains a small header which includes additional
information which may be useful to utilities processing
the output.
.Pp
The first 10 bytes are always arranged as follows:
.Bl -column "Byte range" "Contents" -offset indent
.It Sy "Byte Range Contents"
.It "1 thru 8 Literal text" Dq Li SCRSHOT_
.It "9 File format version number"
.It "10 Remaining number of bytes in the header"
.El
.Pp
Subsequent bytes depend on the version number.
.Bl -column "Version" "13 and up" -offset indent
.It Sy "Version Byte Meaning"
.It "1 11 Terminal width, in characters"
.It " 12 Terminal depth, in characters"
.It " 13 and up The snapshot data"
.El
.Pp
So a dump of an 80x25 screen would start (in hex)
.Bd -literal -offset indent
53 43 52 53 48 4f 54 5f 01 02 50 19
----------------------- -- -- -- --
| | | | ` 25 decimal
| | | `--- 80 decimal
| | `------ 2 remaining bytes of header data
| `--------- File format version 1
`------------------------ Literal "SCRSHOT_"
.Ed
.Sh VIDEO OUTPUT CONFIGURATION
.Ss Boot Time Configuration
You may set the following variables in
.Pa /etc/rc.conf
or
.Pa /etc/rc.conf.local
in order to configure the video output at boot time.
.Pp
.Bl -tag -width foo_bar_var -compact
.It Ar blanktime
Sets the timeout value for the
.Fl t
option.
.It Ar font8x16 , font8x14 , font8x8
Specifies font files for the
.Fl f
option.
.It Ar scrnmap
Specifies a screen output map file for the
.Fl l
option.
.El
.Pp
See
.Xr rc.conf 5
for more details.
.Ss Driver Configuration
The video card driver may let you change default configuration
options, such as the default font, so that you do not need to set up
the options at boot time.
See video card driver manuals, (e.g.\&
.Xr vga 4 )
for details.
.Sh FILES
.Bl -tag -width /usr/share/syscons/scrnmaps/foo-bar -compact
.It Pa /usr/share/syscons/fonts/*
.It Pa /usr/share/vt/fonts/*
font files.
.It Pa /usr/share/syscons/scrnmaps/*
screen output map files (relevant for
.Xr syscons 4
only).
.El
.Sh EXAMPLES
If you want to load
.Pa /usr/share/syscons/fonts/iso-8x16.fnt
to the kernel, run
.Nm
as:
.Pp
.Dl vidcontrol -f 8x16 /usr/share/syscons/fonts/iso-8x16.fnt
.Pp
So long as the font file is in
.Pa /usr/share/syscons/fonts
(if using syscons) or
.Pa /usr/share/vt/fonts
(if using vt),
you may abbreviate the file name as
.Pa iso-8x16 :
.Pp
.Dl vidcontrol -f 8x16 iso-8x16
.Pp
Furthermore, you can also omit font size
.Dq Li 8x16 :
.Pp
.Dl vidcontrol -f iso-8x16
.Pp
Moreover, the suffix specifying the font size can be also omitted; in
this case,
.Nm
will use the size of the currently displayed font to construct the
suffix:
.Pp
.Dl vidcontrol -f iso
.Pp
Likewise, you can also abbreviate the screen output map file name for
the
.Fl l
option if the file is found in
.Pa /usr/share/syscons/scrnmaps .
.Pp
.Dl vidcontrol -l iso-8859-1_to_cp437
.Pp
The above command will load
.Pa /usr/share/syscons/scrnmaps/iso-8859-1_to_cp437.scm .
.Pp
The following command will set-up a 100x37 raster text mode (useful for
some LCD models):
.Pp
.Dl vidcontrol -g 100x37 VESA_800x600
.Pp
The following command will capture the contents of the first virtual
terminal video buffer, and redirect the output to the
.Pa shot.scr
file:
.Pp
.Dl vidcontrol -p < /dev/ttyv0 > shot.scr
.Pp
The following command will dump contents of the fourth virtual terminal
video buffer
to the standard output in the human readable format:
.Pp
.Dl vidcontrol -P < /dev/ttyv3
.Sh SEE ALSO
.Xr kbdcontrol 1 ,
.Xr vidfont 1 ,
.Xr keyboard 4 ,
.Xr screen 4 ,
.Xr syscons 4 ,
.Xr vga 4 ,
.Xr vt 4 ,
.Xr rc.conf 5 ,
.Xr kldload 8 ,
.Xr moused 8 ,
.Xr watch 8
.Pp
The various
.Pa scr2*
utilities in the
.Pa graphics
and
.Pa textproc
categories of the
.Em "Ports Collection" .
.Sh AUTHORS
.An S\(/oren Schmidt Aq Mt sos@FreeBSD.org
.An Sascha Wildner Aq Mt saw@online.de
.Sh CONTRIBUTORS
.An -split
.An Maxim Sobolev Aq Mt sobomax@FreeBSD.org
.An Nik Clayton Aq Mt nik@FreeBSD.org
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