system_cmds-336.23.tar.gz

[apple/system_cmds.git] / getty.tproj / gettytab.5

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.\"     from: @(#)gettytab.5    8.4 (Berkeley) 4/19/94
.\"     $Id: gettytab.5,v 1.1 1999/05/02 04:21:29 wsanchez Exp $
.\"
.Dd April 19, 1994
.Dt GETTYTAB 5
.Os BSD 4.2
.Sh NAME
.Nm gettytab
.Nd terminal configuration data base
.Sh SYNOPSIS
.Nm gettytab
.Sh DESCRIPTION
The
.Nm gettytab
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
.Nm gettytab
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
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
.It "ap bool    false   terminal uses any parity"
.It "bk str     0377    alternate 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"
.It "ce bool    false   use crt erase algorithm"
.It "ck bool    false   use crt kill algorithm"
.It "cl str" Ta Dv NULL Ta
.No "screen clear sequence"
.It "co bool    false   console - add"
.Ql \en
after login prompt
.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
.No "initial environment"
.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
.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"
.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"
.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"
.It "mb bool    false   do flow control based on carrier"
.It "nl bool    false   terminal has (or might have) a newline character"
.It "np bool    false   terminal uses no parity (i.e. 8-bit characters)"
.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"
.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 "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
.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 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
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,
any (or all) of these three may be overridden
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 ,
or
.Em \&o2
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.
.Pp
Should
.Xr getty
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.
.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 the character sequence
.Em \&%h
or
.Em \&%t
to obtain
the hostname or tty name respectively.
.Pf ( Em %%
obtains a single '%' character.)
The hostname is normally obtained from the system,
but may be set by the
.Em \&hn
table entry.
In either case it may be edited with
.Em \&he .
The
.Em \&he
string is a sequence of characters, each character that
is neither '@' nor '#' is copied into the final hostname.
A '@' in the
.Em \&he
string, causes one character from the real hostname to
be copied to the final hostname.
A '#' in the
.Em \&he
string, causes the next character of the real hostname
to be skipped.
Surplus '@' and '#' characters are ignored.
.Pp
When getty execs the login process, given
in the
.Em \&lo
string (usually
.Dq Pa /usr/bin/login ) ,
it will have set
the environment to include the terminal type, as indicated
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 ,
or having received an alarm signal, and exited.
This may be useful to hangup dial in lines.
.Pp
Output from
.Xr getty
is even parity unless
.Em \&op
or
.Em \&np
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
does not check parity of input characters in
.Dv RAW
mode.
.Sh SEE ALSO
.Xr login 1 ,
.Xr termcap 5 ,
.Xr getty 8 .
.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.
Apart form its general lack of flexibility, some
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
format is horrid, something more rational should
have been chosen.
.Pp
This should be converted to use
.Xr termios 4 .
.Sh HISTORY
The
.Nm gettytab
file format appeared in 4.2BSD.