GETTY(VIII) 2/11/75 GETTY(VIII)
NAME
getty - set typewriter mode
SYNOPSIS
/etc/getty [ char ]
DESCRIPTION
Getty is invoked by init (VIII) immediately after a
typewriter is opened following a dial-up. It reads the
user's name and invokes the login command (I) with the name
as argument. While reading the name getty attempts to adapt
the system to the speed and type of terminal being used.
Init calls getty with an argument specified by the ttys file
entry for the typewriter line. Arguments other than `0' can
be used to make getty treat the line specially. Normally,
it sets the speed of the interface to 300 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 Terminet 300 terminal into full-duplex and
return the GSI terminal to non-graphic mode. 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 150 baud and the ``login:'' is typed
again, this time including the character sequence which puts
a Teletype 37 into full-duplex. If a subsequent null
character is received, the speed is changed back to 300
baud.
The user's name is terminated by a new-line or carriage-
return character. The latter results in the system being
set 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.
Finally, login is called with the user's name as argument.
SEE ALSO
init (VIII), login (I), stty (II), ttys (V)
BUGS