371 lines
11 KiB
Groff
371 lines
11 KiB
Groff
.\" Copyright (c) 1983, 1991 The Regents of the University of California.
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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 University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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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.\" from: @(#)gettytab.5 6.7 (Berkeley) 5/10/91
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.\" $Id: gettytab.5,v 1.7 1994/04/28 22:11:14 pk Exp $
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.\"
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.Dd May 10, 1991
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.Dt GETTYTAB 5
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.Os BSD 4.2
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.Sh NAME
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.Nm gettytab
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.Nd terminal configuration data base
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.Sh SYNOPSIS
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.Nm gettytab
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.Sh DESCRIPTION
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The
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.Nm gettytab
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file
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is a simplified version of the
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.Xr termcap 5
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data base
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used to describe terminal lines.
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The initial terminal login process
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.Xr getty 8
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accesses the
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.Nm gettytab
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file each time it starts, allowing simpler
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reconfiguration of terminal characteristics.
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Each entry in the data base
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is used to describe one class of terminals.
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.Pp
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There is a default terminal class,
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.Em default ,
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that is used to set global defaults for all other classes.
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(That is, the
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.Em default
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entry is read, then the entry for the class required
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is used to override particular settings.)
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.Sh CAPABILITIES
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Refer to
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.Xr termcap 5
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for a description of the file layout.
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The
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.Em default
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column below lists defaults obtained if there is
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no entry in the table obtained, nor one in the special
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.Em default
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table.
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.Bl -column Namexx /usr/bin/login Default
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.It Sy Name Type Default Description
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.It "ap bool false terminal uses any parity"
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.It "bk str 0377 alternate end of line character (input break)"
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.It "c0 num unused tty control flags to write messages"
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.It "c1 num unused tty control flags to read login name"
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.It "c2 num unused tty control flags to leave terminal as"
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.It "ce bool false use crt erase algorithm"
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.It "ck bool false use crt kill algorithm"
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.It "cl str" Ta Dv NULL Ta
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.No "screen clear sequence"
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.It "co bool false console - add"
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.Ql \en
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after login prompt
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.It "ds str" Ta So Li ^Y Sc Ta
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.No "delayed suspend character"
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.It "dx bool false set"
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.Dv DECCTLQ
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.It "ec bool false leave echo"
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.Tn OFF
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.It "ep bool false terminal uses even parity"
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.It "er str" Ta So Li ^? Sc Ta
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.No "erase character"
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.It "et str" Ta So Li ^D Sc Ta
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.No "end of text"
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.Pq Dv EOF
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character
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.It "ev str" Ta Dv NULL Ta
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.No "initial enviroment"
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.It "f0 num unused tty mode flags to write messages"
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.It "f1 num unused tty mode flags to read login name"
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.It "f2 num unused tty mode flags to leave terminal as"
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.It "fl str" Ta So Li ^O Sc Ta
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.No "output flush character"
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.It "hc bool false do"
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.Tn NOT
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hangup line on last close
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.It "he str" Ta Dv NULL Ta
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.No "hostname editing string"
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.It "hn str hostname hostname"
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.It "ht bool false terminal has real tabs"
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.It "i0 num unused tty input flags to write messages"
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.It "i1 num unused tty input flags to read login name"
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.It "i2 num unused tty input flags to leave terminal as"
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.It "ig bool false ignore garbage characters in login name"
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.It "im str" Ta Dv NULL Ta
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.No "initial (banner) message"
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.It "in str" Ta So Li ^C Sc Ta
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.No "interrupt character"
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.It "is num unused input speed"
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.It "kl str" Ta So Li ^U Sc Ta
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.No "kill character"
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.It "l0 num unused tty local flags to write messages"
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.It "l1 num unused tty local flags to read login name"
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.It "l2 num unused tty local flags to leave terminal as"
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.It "lc bool false terminal has lower case"
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.It "lm str login: login prompt"
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.It "ln str" Ta So Li ^V Sc Ta
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.No "``literal next'' character"
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.It "lo str" Ta Pa /usr/bin/login Ta
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.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)"
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.It "o0 num unused tty output flags to write messages"
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.It "o1 num unused tty output flags to read login name"
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.It "o2 num unused tty output flags to leave terminal as"
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.It "op bool false terminal uses odd parity"
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.It "os num unused output speed"
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.It "pc str" Ta So Li \e0 Sc Ta
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.No "pad character"
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.It "pe bool false use printer (hard copy) erase algorithm"
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.It "pf num 0 delay"
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between first prompt and following flush (seconds)
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.It "ps bool false line connected to a"
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.Tn MICOM
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port selector
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.It "qu str" Ta So Li \&^\e Sc Ta
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.No "quit character"
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.It "rp str" Ta So Li ^R Sc Ta
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.No "line retype character"
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.It "rw bool false do"
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.Tn NOT
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use raw for input, use cbreak
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.It "sp num unused line speed (input and output)"
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.It "su str" Ta So Li ^Z Sc Ta
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.No "suspend character"
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.It "tc str none table continuation"
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.It "to num 0 timeout (seconds)"
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.It "tt str" Ta Dv NULL Ta
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.No "terminal type (for environment)"
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.It "ub bool false do unbuffered output (of prompts etc)"
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.It "we str" Ta So Li ^W Sc Ta
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.No "word erase character"
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.It "xc bool false do
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.Tn NOT
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echo control chars as
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.Ql ^X
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.It "xf str" Ta So Li ^S Sc Ta Dv XOFF
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(stop output) character
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.It "xn str" Ta So Li ^Q Sc Ta Dv XON
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(start output) character
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.El
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.Pp
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The following capabilities are no longer supported by getty(8):
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.Bl -column Namexx /usr/bin/login Default
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.It "bd num 0 backspace delay"
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.It "cb bool false use crt backspace mode"
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.It "cd num 0 carriage-return delay"
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.It "fd num 0 form-feed (vertical motion) delay"
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.It "nd num 0 newline (line-feed) delay"
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.It "uc bool false terminal is known upper case only"
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.El
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.Pp
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If no line speed is specified, speed will not be altered
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from that which prevails when getty is entered.
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Specifying an input or output speed will override
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line speed for stated direction only.
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.Pp
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Terminal modes to be used for the output of the message,
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for input of the login name,
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and to leave the terminal set as upon completion,
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are derived from the boolean flags specified.
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If the derivation should prove inadequate,
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any (or all) of these three may be overriden
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with one of the
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.Em \&c0 ,
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.Em \&c1 ,
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.Em \&c2 ,
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.Em \&i0 ,
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.Em \&i1 ,
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.Em \&i2 ,
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.Em \&l0 ,
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.Em \&l1 ,
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.Em \&l2 ,
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.Em \&o0 ,
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.Em \&o1 ,
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or
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.Em \&o2
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numeric specifications, which can be used to specify
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(usually in octal, with a leading '0')
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the exact values of the flags.
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These flags correspond to the termios
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.Em c_cflag ,
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.Em c_iflag ,
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.Em c_lflag ,
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and
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.Em c_oflag
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fields, respectively. Each these sets must be completely specified to be
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effective.
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The
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.Em \&f0 ,
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.Em \&f1 ,
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and
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.Em \&f2
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are excepted for backwards compatibility with a previous incarnation of
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the TTY sub-system. In these flags the bottom 16 bits of the (32 bits)
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value contain the sgttyb
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.Em sg_flags
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field, while the top 16 bits represent the local mode word.
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.Pp
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Should
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.Xr getty
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receive a null character
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(presumed to indicate a line break)
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it will restart using the table indicated by the
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.Em nx
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entry. If there is none, it will re-use its original table.
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.Pp
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Delays are specified in milliseconds, the nearest possible
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delay available in the tty driver will be used.
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Should greater certainty be desired, delays
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with values 0, 1, 2, and 3 are interpreted as
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choosing that particular delay algorithm from the driver.
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.Pp
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The
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.Em \&cl
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screen clear string may be preceded by a (decimal) number
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of milliseconds of delay required (a la termcap).
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This delay is simulated by repeated use of the pad character
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.Em \&pc .
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.Pp
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The initial message, and login message,
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.Em \&im
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and
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.Em \&lm
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may include the character sequence
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.Em \&%h
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or
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.Em \&%t
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to obtain
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the hostname or tty name respectively.
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.Pf ( Em %%
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obtains a single '%' character.)
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The hostname is normally obtained from the system,
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but may be set by the
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.Em \&hn
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table entry.
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In either case it may be edited with
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.Em \&he .
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The
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.Em \&he
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string is a sequence of characters, each character that
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is neither '@' nor '#' is copied into the final hostname.
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A '@' in the
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.Em \&he
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string, causes one character from the real hostname to
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be copied to the final hostname.
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A '#' in the
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.Em \&he
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string, causes the next character of the real hostname
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to be skipped.
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Surplus '@' and '#' characters are ignored.
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.Pp
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When getty execs the login process, given
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in the
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.Em \&lo
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string (usually
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.Dq Pa /usr/bin/login ) ,
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it will have set
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the enviroment to include the terminal type, as indicated
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by the
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.Em \&tt
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string (if it exists).
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The
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.Em \&ev
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string, can be used to enter additional data into
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the environment.
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It is a list of comma separated strings, each of which
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will presumably be of the form
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.Em name=value .
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.Pp
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If a non-zero timeout is specified, with
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.Em \&to ,
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then getty will exit within the indicated
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number of seconds, either having
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received a login name and passed control
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to
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.Xr login ,
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or having received an alarm signal, and exited.
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This may be useful to hangup dial in lines.
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.Pp
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Output from
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.Xr getty
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is even parity unless
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.Em \&op
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is specified.
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The
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.Em \&op
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string
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may be specified with
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.Em \&ap
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to allow any parity on input, but generate odd parity output.
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Note: this only applies while getty is being run,
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terminal driver limitations prevent a more complete
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implementation.
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.Xr Getty
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does not check parity of input characters in
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.Dv RAW
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mode.
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.Sh SEE ALSO
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.Xr login 1 ,
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.Xr termcap 5 ,
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.Xr getty 8 .
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.Sh BUGS
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The special characters (erase, kill, etc.) are reset to system defaults
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by
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.Xr login 1 .
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In
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.Em all
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cases, '#' or '^H' typed in a login name will be treated as
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an erase character, and '@' will be treated as a kill character.
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.Pp
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The delay stuff is a real crock.
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Apart form its general lack of flexibility, some
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of the delay algorithms are not implemented.
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The terminal driver should support sane delay settings.
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.Pp
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The
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.Em \&he
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capability is stupid.
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.Pp
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The
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.Xr termcap
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format is horrid, something more rational should
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have been chosen.
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.Pp
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This should be converted to use
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.Xr termios 4 .
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.Sh HISTORY
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The
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.Nm gettytab
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file format appeared in 4.2BSD.
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