GETTY(VII) 9/19/73 GETTY(VII)
NAME
getty - set typewriter mode
SYNOPSIS
/etc/getty
DESCRIPTION
Getty is invoked by init (VII) immediately after a
typewriter is opened following a dial-up. The user's login
name is read and the login(I) command is called with this
name as an argument. While reading this name getty attempts
to adapt the system to the speed and type of terminal being
used.
Getty initially sets the speed of the interface to 150 baud,
specifies that raw mode is to be used (break on every
character), that echo is to be suppressed, and either parity
allowed. It types the ``login:'' message (which includes
the characters which put the 37 Teletype terminal into
full-duplex and unlock its keyboard). Then the user's name
is read, a character at a time. If a null character is
received, it is assumed to be the result of the user pushing
the ``break'' (``interrupt'') key. The speed is then
changed to 300 baud and the ``login:'' is typed again, this
time with the appropriate sequence which puts a GE TermiNet
300 into full-duplex. This sequence is acceptable to other
300 baud terminals also. If a subsequent null character is
received, the speed is changed back to 150 baud.
The user's name is terminated by a new-line or carriage-
return character. The latter results in the system being
set to to treat carriage returns appropriately (see
stty(II)).
The user's name is scanned to see if it contains any lower-
case alphabetic characters; if not, and if the name is
nonempty, the system is told to map any future upper-case
characters into the corresponding lower-case characters.
Thus UNIX is usable from upper-case-only terminals.
Finally, login is called with the user's name as argument.
SEE ALSO
init(VII), login(I), stty(II)