getty(1m)
_________________________________________________________________
getty
set terminal type, modes, speed, and line discipline
_________________________________________________________________
SYNTAX
/etc/getty [ -h ] [ -t timeout ] line [ speed [ terminaltype [
linedisc ] ] ]
/etc/getty -c file
DESCRIPTION
Getty is a program that is invoked by init(1M). It is the second
process in the series init-getty-login-shell that ultimately
connects a user with a DG/UX system.
First, getty generates a system identification message from the
values returned by the uname(2) system call. Then, if /etc/issue
exists, it outputs this to the user's terminal, followed finally
by the login message field for the entry it is using from
/etc/gettydefs. Getty reads the user's login name and invokes
the login(1) command with the user's name as argument. While
reading the name, getty tries to adapt the system to the speed
and type of terminal being used.
Line is the name of a tty line in /dev to which getty is to
attach itself. Getty uses line as the name of a file in the /dev
directory to open for reading and writing. Unless you invoke
getty with the -h flag, getty forces a hangup on the line by
setting the speed to zero before setting the speed to the default
or specified speed.
The -t flag, plus timeout in seconds, specifies that getty should
exit if the open on the line succeeds and no one types anything
in the specified number of seconds.
The optional second argument, speed, is a label to a speed and
tty definition in the file /etc/gettydefs. This definition tells
getty at what speed to initially run, what the login message
should look like, what the initial tty settings are, and what
speed to try next if the user indicates that the speed is
inappropriate (by typing a <break> character). The default speed
is 300 baud.
The optional third argument is a character string that will be
assigned to the TERM variable and exported. If this argument is
not supplied, no TERM value is assigned. Getty does not confirm
that the terminaltype is valid.
DG/UX 4.00 Page 1
Licensed material--property of copyright holder(s)
getty(1m)
The optional fourth argument, linedisc, is a character string
describing which line discipline to use in communicating with the
terminal. The hooks for line disciplines are available in the
operating system, but the only one presently available is the
default line discipline, LDISC0.
When given no optional arguments, getty sets the speed of the
interface to 300 baud, specifies that raw mode is to be used
(awaken on every character), and that echo is to be suppressed.
Either parity is allowed, new-line characters are converted to
carriage-return line-feed, and tab expansion performed on the
standard output. Getty types the login message before reading
the user's name a character at a time. If a null character (or
framing error) is received, getty assumes that the user pushed
the BREAK key. Getty then tries the next speed in the series
found in /etc/gettydefs.
The user's name is terminated by a new-line or carriage-return
character. The latter sets the system to treat carriage returns
appropriately (see ioctl(2)).
The user's name is scanned for lowercase alphabetic characters;
if none are found and the name is non-empty, the system is told
to map any future uppercase characters into the corresponding
lowercase characters.
Finally, login is called with the user's name as an argument.
Additional arguments may be typed after the login name. These
are passed to login, which places them in the environment (see
login(1)).
A check option is provided. When getty is invoked with the -c
option and file, it scans the file as if it were scanning
/etc/gettydefs and prints out the results to the standard output.
If there are any unrecognized modes or improperly constructed
entries, it reports these. If the entries are correct, it prints
out the values of the various flags (see ioctl(2)). Note that
some values are added to the flags automatically.
FILES
/etc/gettydefs
/etc/issue
SEE ALSO
ct(1C), init(1M), login(1), ioctl(2), gettydefs(4), inittab(4),
tty(7).
DG/UX 4.00 Page 2
Licensed material--property of copyright holder(s)
getty(1m)
EXCEPTIONS
DG/UX does not support SYS V style kernel terminal types. The
terminaltype is the name of a terminfo entry.
Unlike SYS V getty, DG/UX getty understands control character
assignments (see gettydefs(4)).
DG/UX 4.00 Page 3
Licensed material--property of copyright holder(s)