NetBSD/libexec/getty/gettytab.5

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.\" $NetBSD: gettytab.5,v 1.28 2002/01/15 02:21:49 wiz Exp $
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.\"
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.\" Copyright (c) 1983, 1991, 1993
.\" The Regents of the University of California. All rights reserved.
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.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
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.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
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.\" 3. All advertising materials mentioning features or use of this software
.\" must display the following acknowledgement:
.\" This product includes software developed by the University of
.\" California, Berkeley and its contributors.
.\" 4. Neither the name of the University nor the names of its contributors
.\" may be used to endorse or promote products derived from this software
.\" without specific prior written permission.
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.\" from: @(#)gettytab.5 8.4 (Berkeley) 4/19/94
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.\"
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.Dd April 19, 1994
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.Dt GETTYTAB 5
.Os
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.Sh NAME
.Nm gettytab
.Nd terminal configuration data base
.Sh SYNOPSIS
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.Nm
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.Sh DESCRIPTION
The
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.Nm
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file
is a simplified version of the
.Xr termcap 5
data base
used to describe terminal lines.
The initial terminal login process
.Xr getty 8
accesses the
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.Nm
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file each time it starts, allowing simpler
reconfiguration of terminal characteristics.
Each entry in the data base
is used to describe one class of terminals.
.Pp
Where to run
.Xr getty 8
processes is normally defined by
.Xr ttys 5 .
.Pp
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There is a default terminal class,
.Em default ,
that is used to set global defaults for all other classes.
(That is, the
.Em default
entry is read, then the entry for the class required
is used to override particular settings.)
.Sh CAPABILITIES
Refer to
.Xr termcap 5
for a description of the file layout.
The
.Em default
column below lists defaults obtained if there is
no entry in the table obtained, nor one in the special
.Em default
table.
.Bl -column Namexx /usr/bin/login Default
.It Sy Name Type Default Description
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.It "al str NULL user to auto-login instead of prompting"
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.It "ap bool false terminal uses any parity"
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.It "bk str 0377 alternative end of line character (input break)"
.It "c0 num unused tty control flags to write messages"
.It "c1 num unused tty control flags to read login name"
.It "c2 num unused tty control flags to leave terminal as"
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.It "ce bool false use crt erase algorithm"
.It "ck bool false use crt kill algorithm"
.It "cl str" Ta Dv NULL Ta
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.No "screen clear sequence"
.It "co bool false console - add"
.Ql \en
after login prompt
.It "cs bool false clear screen based on terminal type in /etc/ttys"
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.It "ds str" Ta So Li ^Y Sc Ta
.No "delayed suspend character"
.It "dx bool false set"
.Dv DECCTLQ
.It "ec bool false leave echo"
.Tn OFF
.It "ep bool false terminal uses even parity"
.It "er str" Ta So Li ^? Sc Ta
.No "erase character"
.It "et str" Ta So Li ^D Sc Ta
.No "end of text"
.Pq Dv EOF
character
.It "ev str" Ta Dv NULL Ta
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.No "initial environment"
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.It "f0 num unused tty mode flags to write messages"
.It "f1 num unused tty mode flags to read login name"
.It "f2 num unused tty mode flags to leave terminal as"
.It "fl str" Ta So Li ^O Sc Ta
.No "output flush character"
.It "hc bool false do"
.Tn NOT
hangup line on last close
.It "he str" Ta Dv NULL Ta
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.No "hostname editing string"
.It "hn str hostname hostname"
.It "ht bool false terminal has real tabs"
.It "i0 num unused tty input flags to write messages"
.It "i1 num unused tty input flags to read login name"
.It "i2 num unused tty input flags to leave terminal as"
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.It "if str NULL display named file before prompt, like /etc/issue"
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.It "ig bool false ignore garbage characters in login name"
.It "im str" Ta Dv NULL Ta
.No "initial (banner) message"
.It "in str" Ta So Li ^C Sc Ta
.No "interrupt character"
.It "is num unused input speed"
.It "kl str" Ta So Li ^U Sc Ta
.No "kill character"
.It "l0 num unused tty local flags to write messages"
.It "l1 num unused tty local flags to read login name"
.It "l2 num unused tty local flags to leave terminal as"
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.It "lc bool false terminal has lower case"
.It "lm str login: login prompt"
.It "ln str" Ta So Li ^V Sc Ta
.No "``literal next'' character"
.It "lo str" Ta Pa /usr/bin/login Ta
.No "program to exec when name obtained"
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.It "mb bool false do flow control based on carrier"
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.It "nl bool false terminal has (or might have) a newline character"
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.It "np bool false terminal uses no parity (i.e. 8-bit characters)"
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.It "nx str default next table (for auto speed selection)"
.It "o0 num unused tty output flags to write messages"
.It "o1 num unused tty output flags to read login name"
.It "o2 num unused tty output flags to leave terminal as"
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.It "op bool false terminal uses odd parity"
.It "os num unused output speed"
.It "pc str" Ta So Li \e0 Sc Ta
.No "pad character"
.It "pe bool false use printer (hard copy) erase algorithm"
.It "pf num 0 delay"
between first prompt and following flush (seconds)
.It "pp str unused PPP authentication program"
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.It "ps bool false line connected to a"
.Tn MICOM
port selector
.It "qu str" Ta So Li \&^\e Sc Ta
.No "quit character"
.It "rp str" Ta So Li ^R Sc Ta
.No "line retype character"
.It "rw bool false do"
.Tn NOT
use raw for input, use cbreak
.It "sp num unused line speed (input and output)"
.It "su str" Ta So Li ^Z Sc Ta
.No "suspend character"
.It "tc str none table continuation"
.It "to num 0 timeout (seconds)"
.It "tt str" Ta Dv NULL Ta
.No "terminal type (for environment)"
.It "ub bool false do unbuffered output (of prompts etc)"
.It "we str" Ta So Li ^W Sc Ta
.No "word erase character"
.It "xc bool false do"
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.Tn NOT
echo control chars as
.Ql ^X
.It "xf str" Ta So Li ^S Sc Ta Dv XOFF
(stop output) character
.It "xn str" Ta So Li ^Q Sc Ta Dv XON
(start output) character
.El
.Pp
The following capabilities are no longer supported by
.Xr getty 8 :
.Bl -column Namexx /usr/bin/login Default
.It "bd num 0 backspace delay"
.It "cb bool false use crt backspace mode"
.It "cd num 0 carriage-return delay"
.It "fd num 0 form-feed (vertical motion) delay"
.It "nd num 0 newline (line-feed) delay"
.It "uc bool false terminal is known upper case only"
.El
.Pp
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If no line speed is specified, speed will not be altered
from that which prevails when getty is entered.
Specifying an input or output speed will override
line speed for stated direction only.
.Pp
Terminal modes to be used for the output of the message,
for input of the login name,
and to leave the terminal set as upon completion,
are derived from the boolean flags specified.
If the derivation should prove inadequate,
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any (or all) of these three may be overridden
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with one of the
.Em \&c0 ,
.Em \&c1 ,
.Em \&c2 ,
.Em \&i0 ,
.Em \&i1 ,
.Em \&i2 ,
.Em \&l0 ,
.Em \&l1 ,
.Em \&l2 ,
.Em \&o0 ,
.Em \&o1 ,
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or
.Em \&o2
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numeric specifications, which can be used to specify
(usually in octal, with a leading '0')
the exact values of the flags.
These flags correspond to the termios
.Em c_cflag ,
.Em c_iflag ,
.Em c_lflag ,
and
.Em c_oflag
fields, respectively.
Each these sets must be completely specified to be effective.
The
.Em \&f0 ,
.Em \&f1 ,
and
.Em \&f2
are excepted for backwards compatibility with a previous incarnation of
the TTY sub-system.
In these flags the bottom 16 bits of the (32 bits) value contain the sgttyb
.Em sg_flags
field, while the top 16 bits represent the local mode word.
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.Pp
Should
.Xr getty 8
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receive a null character
(presumed to indicate a line break)
it will restart using the table indicated by the
.Em nx
entry.
If there is none, it will re-use its original table.
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.Pp
Delays are specified in milliseconds, the nearest possible
delay available in the tty driver will be used.
Should greater certainty be desired, delays
with values 0, 1, 2, and 3 are interpreted as
choosing that particular delay algorithm from the driver.
.Pp
The
.Em \&cl
screen clear string may be preceded by a (decimal) number
of milliseconds of delay required (a la termcap).
This delay is simulated by repeated use of the pad character
.Em \&pc .
.Pp
The initial message, and login message,
.Em \&im
and
.Em \&lm
may include any of the following character sequences, which expand to
information about the environment in which
.Xr getty 8
is running.
.Pp
.Bl -tag -width \&%xxx -compact
.It \&%d
The current date.
.It \&%h
The hostname of the machine, which is normally obtained from the
system using
.Xr gethostname 3 ,
but may also be overridden by the
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.Em \&hn
table entry.
In either case it may be edited with the
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.Em \&he
string.
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A '@' in the
.Em \&he
string causes one character from the real hostname to
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be copied to the final hostname.
A '#' in the
.Em \&he
string causes the next character of the real hostname
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to be skipped.
Each character that
is neither '@' nor '#' is copied into the final hostname.
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Surplus '@' and '#' characters are ignored.
.It \&%t
The tty name.
.It "\&%m, \&%r, \&%s, \&%v"
The type of machine, release of the operating system, name of the
operating system, and version of the kernel, respectively, as
returned by
.Xr uname 3 .
.It \&%%
A
.Dq %
character.
.El
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.Pp
When getty execs the login process, given
in the
.Em \&lo
string (usually
.Dq Pa /usr/bin/login ) ,
it will have set
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the environment to include the terminal type, as indicated
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by the
.Em \&tt
string (if it exists).
The
.Em \&ev
string, can be used to enter additional data into
the environment.
It is a list of comma separated strings, each of which
will presumably be of the form
.Em name=value .
.Pp
If a non-zero timeout is specified, with
.Em \&to ,
then getty will exit within the indicated
number of seconds, either having
received a login name and passed control
to
.Xr login 1 ,
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or having received an alarm signal, and exited.
This may be useful to hangup dial in lines.
.Pp
Output from
.Xr getty 8
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is even parity unless
.Em \&op
or
.Em \&np
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is specified.
The
.Em \&op
string
may be specified with
.Em \&ap
to allow any parity on input, but generate odd parity output.
Note: this only applies while getty is being run,
terminal driver limitations prevent a more complete
implementation.
.Xr getty 8
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does not check parity of input characters in
.Dv RAW
mode.
.Pp
If
.Em \&pp
string is specified and a Point to Point Protocol
.Pq Tn PPP
link bringup sequence is recognized,
.Xr getty 8
will invoke the program referenced by the
.Em \&pp
string, e.g.
.Xr pppd 8 .
This can be used to handle incoming
.Tn PPP
calls.
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.Sh SEE ALSO
.Xr login 1 ,
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.Xr gethostname 3 ,
.Xr uname 3 ,
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.Xr termcap 5 ,
.Xr ttys 5 ,
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.Xr getty 8 ,
.Xr pppd 8
.Sh HISTORY
The
.Nm
file format appeared in
.Bx 4.2 .
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.Sh BUGS
The special characters (erase, kill, etc.) are reset to system defaults
by
.Xr login 1 .
In
.Em all
cases, '#' or '^H' typed in a login name will be treated as
an erase character, and '@' will be treated as a kill character.
.Pp
The delay stuff is a real crock.
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Apart from its general lack of flexibility, some
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of the delay algorithms are not implemented.
The terminal driver should support sane delay settings.
.Pp
The
.Em \&he
capability is stupid.
.Pp
The
.Xr termcap 5
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format is horrid, something more rational should
have been chosen.