gettydefs - Terminal attributes
/etc/gettydefs
The gettydefs file supplies the getty command with information
about various terminal attributes, such as the
default initialization and the login message. The gettydefs
file contains single line entries that are separated
by blank lines. Each entry contains five fields; each
field is separated by a number sign (#). You can indicate
comments in the file by putting a number sign (#) at the
beginning of a line.
When the getty command is invoked, it scans the gettydefs
file for the first entry with a matching identifier field
(see below). If the gettydefs file cannot be opened,
internal default settings are used. If a match is found,
then the matching entry is parsed, and the terminal
attributes are set based on the fields specified in the
entry. If a match is not found, the first gettydefs file
entry is used; therefore the first entry in gettydefs must
be the default entry. The maximum length of each entry is
255 characters.
The format of each entry is as follows:
Identifier#Iflag#Fflag#Message#Next Identifier
Identifies an entry. The getty command uses an identifier
as an argument and searches for the first entry with a
matching identifier field. The identifier must be unique.
Specifies the initial terminal flags that the getty command
uses to set the terminal attributes after a line has
been successfully opened. There are four categories for
the terminal attributes. The input flags control the
basic input attributes. The output flags control how the
terminal system processes output. The control flags
describe how the hardware controls the terminal. The
local flags control various terminal functions. Refer to
termios(4) for the description of the possible settings on
a terminal port. You can specify the symbol SANE to
select default settings. The default settings set the
input flags to BRKINT, IGNPAR, ICRNL and IXON; the output
flags to OPOST and ONLCR; the control flags to CS8, and
CREAD; and the local flags to ISIG, ICANON, IEXTEN, ECHO,
ECHOK. Specifies the final terminal flags used by the
getty command. These flags are set after the getty command
receives a valid login name from the standard input. The
output flags and the control flags are set to the terminal
attributes specified in Fflag. The input flags and local
flags are appended to the initial flags specified in the
Iflag field. Specifies the login message. The login message
can include the character sequence %h to obtain the
host name and %t to obtain the terminal name. This field
is limited to 79 characters. Specifies that if the speed
specified in the current entry was incorrect, the entry
corresponding to this field should be used. The getty command
obtains the new entry from this field, and the scan
process is repeated.
The following is an example of an entry in the gettydefs
file containing settings for an 8 bit, no parity, 9600
baud, locally connected terminal line:
9600# B9600 HUPCL CS8 CLOCAL # B9600 SANE IXANY TAB3 CLOCAL
#login: #9600
The following is an example of an entry in the gettydefs
file containing settings for a 8 bit, no parity, 2400
baud, dial in modem line:
M2400# B2400 HUPCL CS8 # B2400 SANE IXANY TAB3 HUPCL
#login: #M1200
Specifies the command that initializes and controls terminal
lines.
Commands: getty(8)
Functions: kill(2)
gettydefs(4)
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