242 lines
7.5 KiB
Groff
242 lines
7.5 KiB
Groff
.\"
|
|
.\" 5799-WZQ (C) COPYRIGHT IBM CORPORATION 1986,1987,1988
|
|
.\" LICENSED MATERIALS - PROPERTY OF IBM
|
|
.\" REFER TO COPYRIGHT INSTRUCTIONS FORM NUMBER G120-2083
|
|
.\"
|
|
.\"WISC: Header:cons.4_ca 11.3$
|
|
.\"WISC: ACIS:cons.4_ca 11.3$
|
|
.\"WISC: Source: /ibm/acis/usr/man/man4/RCS/cons.4_ca,v $
|
|
.\" This file uses -man macros.
|
|
.TH CONS 4 "Sept 1988" "Space overwritten by .AC macro" " "
|
|
.AC 1 0
|
|
.SH NAME
|
|
cons \- keyboard and console display interface
|
|
.SH DESCRIPTION
|
|
The keyboard and various possible displays combine to
|
|
provide a terminal-like
|
|
interface to the system. Internally, these are separate devices which
|
|
software combines to emulate a normal terminal. See the appropriate manual
|
|
pages for information about each display and the keyboard.
|
|
.PP
|
|
The keyboard adapter also supports the speaker, which is activated
|
|
when the ASCII character \fBbel\fP (\fB^G\fP)
|
|
is sent to the display with software.
|
|
For additional information on speaker control, see \fIspeaker\fP(4).
|
|
.PP
|
|
.B Console Device Control
|
|
.PP
|
|
The display devices,
|
|
\fI/dev/ttyaed\fR, \fI/dev/ttyap16\fR, \fI/dev/ttyap8c\fR,
|
|
\fI/dev/ttyapa8\fR, \fI/dev/ttyega\fR, \fI/dev/ttymono\fR,
|
|
\fI/dev/ttympel\fR, \fI/dev/ttyvga\fR, and \fI/dev/tty8514\fR are all
|
|
minor devices under
|
|
\fI/dev/console\fR, and are all capable of displaying console output.
|
|
Unique to this system is the fact that you may have one or more of these
|
|
displays on your workstation at a time and any one can act as a console.
|
|
With only one keyboard and system mouse, the console driver
|
|
multiplexes these input devices to the many displays.
|
|
All of the displays may have simultaneous logins and the user
|
|
can ``hot key'' between each display.
|
|
At first, this
|
|
``input focus''
|
|
is on
|
|
the first device in the above sequence to
|
|
be found at initialization time. The input focus
|
|
can be manually switched to the next available display by pressing the
|
|
default ``hot key'' <Alt><Scroll Lock>.
|
|
When the
|
|
input focus
|
|
is on a display, all keyboard and mouse data are sent to the process(es)
|
|
that read from that display.
|
|
.PP
|
|
If no other console tty device is open, and only the default input
|
|
emulator is used (see \fIkbdemul\fP(4)), the input focus is set to
|
|
\fI/dev/console\fP. In this case, <Alt><Scroll Lock> only switches
|
|
which display gets console output.
|
|
In the case where one or more tty devices are open, or the default input
|
|
emulator changes, \fI/dev/console\fP gets no input. It tries to send output
|
|
to the currently focused device. A user can redirect these console messages
|
|
to any tty devices with the TIOCCONS ioctl.
|
|
.PP
|
|
To support the many displays and the multiplexing between them, an
|
|
emulator package was developed to work with the console driver.
|
|
This package allows different types of emulation on input and output to
|
|
be written independently of device.
|
|
.PP
|
|
The display devices \fI/dev/aed\fP, \fI/dev/apa16\fP, \fI/dev/apa8c\fP,
|
|
\fI/dev/apa8\fP, \fI/dev/ega\fR, \fI/dev/mono\fP,
|
|
\fI/dev/mpel\fR, \fI/dev/vga\fR, and \fI/dev/ibm8514\fR
|
|
are also minor devices to
|
|
\fI/dev/console\fP. They are typically used by window managers and other
|
|
graphic applications. When the focus is pointed to one of these display
|
|
devices, the console messages are put in a circular buffer
|
|
(see \fIbufemul\fP(4))
|
|
unless redirected with the TIOCCONS ioctl.
|
|
The buffer is flushed to the screen upon closing the display device.
|
|
.PP
|
|
The following are generic console \fIioctls\fP defined in \fIscreen_cousf.u\fP:
|
|
.TP 20
|
|
CON_SELECT_SCREEN
|
|
Output focus is set to display number (arg > 0) or
|
|
to next display in list (arg < 0). Previous display number is returned.
|
|
.TP 20
|
|
CON_GET_SCREEN
|
|
Just returns the current output focus display number.
|
|
.TP 20
|
|
EIGETD
|
|
Gets the number of the current input emulator for this display.
|
|
.TP 20
|
|
EOGETD
|
|
Gets the number of the current output emulator for this display.
|
|
.TP 20
|
|
EISETD
|
|
Sets the input emulator and returns the previous for this display.
|
|
.TP 20
|
|
EOSETD
|
|
Sets the output emulator and returns the previous for this display.
|
|
.TP 20
|
|
CON_INIT_SCREEN
|
|
Initializes the specified display (arg >=0) or this display
|
|
(arg < 0).
|
|
.TP 20
|
|
CON_GET_FOCUS_CODE
|
|
Gets the current keyboard code for setting the console
|
|
focus (affects xemul only).
|
|
.TP 20
|
|
CON_SET_FOCUS_CODE
|
|
Sets the current keyboard code for setting the console
|
|
focus (affects xemul only), and return the previous code.
|
|
.PP
|
|
All of the above commands take integer arguments.
|
|
.PP
|
|
The following are generic console \fIioctls\fP defined in \fIconsio.h\fP:
|
|
.TP 20
|
|
SCRIOCGETF
|
|
Gets the screen control flags for the given display number.
|
|
.TP 20
|
|
SCRIOCSETC
|
|
Sets the screen control flags for the given display number.
|
|
.PP
|
|
.in +10
|
|
SCRIOCGETF and SCRIOCSETC use the following structure:
|
|
.DT
|
|
.nf
|
|
struct screen_control {
|
|
int device; /* which screen/display to control */
|
|
int switches; /* Flags for this screen */
|
|
};
|
|
.fi
|
|
.sp 2
|
|
.RS 6
|
|
.TP 20
|
|
CONSDEV_PRESENT
|
|
Display is present on this system.
|
|
This bit cannot be changed by SCRIOSETC.
|
|
.TP 20
|
|
CONSDEV_KERNEL
|
|
Display is available to the kernel.
|
|
.TP 20
|
|
CONSDEV_USER
|
|
Display is available to the user.
|
|
.TP 20
|
|
CONSDEV_INIT
|
|
Display has been initialized for output.
|
|
.TP 20
|
|
CONSDEV_TTY
|
|
Diplay has been initialuzed for output.
|
|
This bit cannot be changed by SCRIOSETC.
|
|
.TP 20
|
|
CONSDEV_GRA
|
|
Graphics display has been opened directly by minor device number.
|
|
This bit cannot be changed by SCRIOSETC.
|
|
.TP 20
|
|
CONSDEV_NOINPUT
|
|
Prevents the "round-robin" console focus-switching from finding this
|
|
display. This flag is cleared when \fIbuf_emul\fP is closed.
|
|
.TP 20
|
|
SCRSETNIP
|
|
Sets the no-input bit in the screen control flags for the
|
|
display's current file description.
|
|
.TP 20
|
|
SCRCLRNIP
|
|
Clears the no-input bit in the screen control flags for the
|
|
display's current file description.
|
|
.RE
|
|
.PP
|
|
The following \fIioctl\fP is defined in \fIbufemul.h\fP:
|
|
.TP 20
|
|
BUFDISPINFO
|
|
\fIArg\fP returns the following information about the display:
|
|
.PP
|
|
.RS 6
|
|
.TP 20
|
|
BUF_IS_ATR(arg)
|
|
True when the CPU is an IBM 6152 Academic System.
|
|
.TP 20
|
|
BUF_IS_RTPC(arg)
|
|
True when the CPU is an IBM RT PC.
|
|
.TP 20
|
|
BUF_GET_PCCODE(x)
|
|
Get PC-Code version/type byte (IBM 6152 only).
|
|
.bp
|
|
.TP 20
|
|
BUF_GET_VGA(arg)
|
|
Get the type of display connected to the VGA.
|
|
0=none, 1=color, 2=gray. Valid only for the IBM 6152 Academic System.
|
|
.TP 20
|
|
BUF_GET_8514(arg)
|
|
Get the type of display connected to the IBM 8514/A.
|
|
0=none, 1=color, 2=gray. Valid only for the IBM 6152 Academic System.
|
|
.TP 20
|
|
BUF_GET_EGA(arg)
|
|
Returns the value of the switches on the EGA display. Valid only for the IBM RT PC with an EGA card installed.
|
|
.RE
|
|
.PP
|
|
All of the above \fIioctl\fP system calls are device-independent controls
|
|
for dealing with the emulators.
|
|
.PP
|
|
Each emulator has its own set of \fIioctls\fP for its own emulation purposes.
|
|
These other \fIiotls\fP are used in window-manager emulators for operations
|
|
such as passing/positioning the mouse locator for/on the display.
|
|
See the man page for any particular emulator for more information.
|
|
.PP
|
|
.SH NOTE
|
|
On the IBM RT PC, the kernel flashes ``98'' on the LEDs if it cannot find any
|
|
configured display during initialization, and then proceeds.
|
|
.SH DIAGNOSTICS
|
|
None.
|
|
.SH FILES
|
|
.PP
|
|
For the IBM RT PC:
|
|
.br
|
|
/dev/console
|
|
.br
|
|
/dev/aed
|
|
.br
|
|
/dev/apa16
|
|
.br
|
|
/dev/apa8c
|
|
.br
|
|
/dev/apa8
|
|
.br
|
|
/dev/ega
|
|
.br
|
|
/dev/mono
|
|
.br
|
|
/dev/mpel
|
|
.br
|
|
.PP
|
|
For the IBM 6152 Academic System:
|
|
.br
|
|
/dev/vga
|
|
.br
|
|
/dev/ibm8514
|
|
.SH "SEE ALSO"
|
|
bufemul(4), bus(4), ibm5081(4), ibm5151(4), ibm6153(4), ibm6154(4),
|
|
ibm6155(4), ibm8514(4), ibmaed(4), ibmemul(4), kbdemul(4),
|
|
speaker(4), stdemul(4), tty(4), vga(4), xemul(4), setscreen(8)
|
|
.br
|
|
``IBM/4.3 Console Emulators'', in Volume II, Supplementary Documents
|
|
|
|
|