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Annotation of researchv10dc/dist/man/v3/man7/getty.7, revision 1.1.1.1

1.1       root        1: .pa 1
                      2: .he '12/11/72''GETTY (VII)'
                      3: .tr |
                      4: .ti 0
                      5: .nf
                      6: NAME           getty  -- set typewriter mode and get user's name
                      7: .fi
                      8: .sp
                      9: .ti 0
                     10: SYNOPSIS       /etc/getty
                     11: .sp
                     12: .ti 0
                     13: DESCRIPTION
                     14: .br
                     15: .in 8
                     16: getty_____
                     17: is invoked
                     18: by init (VII)
                     19: immediately after a typewriter is opened
                     20: following a dial-in.
                     21: The user's login name is read and the login(I) command
                     22: is called with this name as an argument.
                     23: While reading this name getty_____
                     24: attempts to adapt the system to the speed and type of terminal
                     25: being used.
                     26: .sp
                     27: getty_____ initially sets the speed of the interface to 150 baud,
                     28: specifies that raw mode is to be used (break on every character),
                     29: that echo is to be suppressed, and either parity
                     30: allowed.
                     31: It types the "login:" message
                     32: (which includes the characters which put the 37 Teletype
                     33: terminal into full-duplex and unlock its keyboard).
                     34: Then the user's name is read, a character at a time.
                     35: If a null character is received, it is assumed to be the result
                     36: of the user pushing the "break" ("interrupt") key.
                     37: The speed is then
                     38: changed to 300 baud and the "login:" is typed again,
                     39: this time with the appropriate
                     40: sequence which puts a GE TermiNet 300 into full-duplex.
                     41: This sequence is acceptable to other 300 baud terminals also.
                     42: If a subsequent null character is received,
                     43: the speed is changed again.
                     44: The general approach is to cycle through a set of speeds in
                     45: response to null characters caused by breaks.
                     46: The sequence at this installation is 150, 300, and 134.5 baud.
                     47: .sp
                     48: Detection of IBM|2741s is accomplished while the speed is
                     49: set to 150 baud.
                     50: The user sends a 2741 style "eot"
                     51: character by pushing the attention key or by typing return;
                     52: at 150 baud, this character looks like the ascii "~" (174988).
                     53: Upon receipt of the "eot", the system is set to operate 2741s
                     54: and a "login: " message is typed.
                     55: 
                     56: The user's name is terminated by a new-line or
                     57: carriage-return character.
                     58: The latter results in the system being set to
                     59: to treat carriage returns appropriately (see stty(II)).
                     60: 
                     61: The user's name is scanned to see if
                     62: it contains any lower-case alphabetic characters; if not,
                     63: and if the name is nonempty, the
                     64: system is told to map any future upper-case characters
                     65: into the corresponding lower-case characters.
                     66: Thus UNIX is usable from upper-case-only terminals.
                     67: 
                     68: Finally, login is called with the user's name as argument.
                     69: .sp
                     70: .in 16
                     71: .ti 0
                     72: FILES          --
                     73: .sp
                     74: .ti 0
                     75: SEE ALSO       init(VII), login(I), stty(II)

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