Research V4 development

Work on file man/man7/getty.7

Co-Authored-By: Ken Thompson <ken@research.uucp>
Co-Authored-By: Joe Ossanna <jfo@research.uucp>
Synthesized-from: v4

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+.th GETTY VII 9/19/73
+.sh NAME
+getty  \*- set typewriter mode
+.sh SYNOPSIS
+.bd /etc/getty
+.sh DESCRIPTION
+.it Getty
+is invoked
+by
+.it "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
+.it getty
+attempts to adapt the system to the speed and type of terminal
+being used.
+.s3
+.it 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.
+.s3
+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)).
+.s3
+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.
+.s3
+Finally, login is called with the user's name as argument.
+.sh "SEE ALSO"
+init(VII), login(I), stty(II)