PWB1/usr/man/man2/stty.2

.th STTY II 5/31/77
.sh NAME
stty \*- set mode of terminal
.sh SYNOPSIS
(stty = 31.)
.br
(file descriptor in r0)
.br
.ft B
sys stty; arg
.br
.li
...
.br
arg:  .byte ispeed, ospeed; .byte erase, kill; mode
.s3
.nf
stty(fildes, arg)
struct {
	char	ispeed, ospeed;
	char	erase, kill;
	int 	mode;
} *arg;
.fi
.ft R
.s3
.sh DESCRIPTION
.it Stty
sets mode bits and character speeds for the terminal whose file descriptor
is passed in r0 (resp. is the first argument to the call).
First, the system delays until the terminal is quiescent.
The input and output speeds are set from the first two bytes
of the argument structure
as indicated by the following table,
which corresponds to the
speeds supported by the DH-11 interface.
.s3
.lp +8 4
0	(hang up modem)
.lp +8 4
1	50 baud
.lp +8 4
2	75 baud
.lp +8 4
3	110 baud
.lp +8 4
4	134.5 baud
.lp +8 4
5	150 baud
.lp +8 4
6	200 baud
.lp +8 4
7	300 baud
.lp +8 4
8	600 baud
.lp +8 4
9	1200 baud
.lp +8 4
10	1800 baud
.lp +8 4
11	2400 baud
.lp +8 4
12	4800 baud
.lp +8 4
13	9600 baud
.lp +8 4
14	External A
.lp +8 4
15	External B
.s3
.i0
In the current configuration,
only 110, 150 and 300 baud are really supported on dial-up lines.
The half-duplex line discipline
required for the 202 modem (1200 baud)
is not supplied.
.s3
The next two characters of the argument structure
specify the erase and kill characters respectively.
(Defaults are # and @.)
.s3
The
.it mode
contains several bits that determine the
system's treatment of the terminal:
.s3
.lp +12 7
100000	select one of two types of backspace delays
.lp +12 7
040000	select one of two types of form-feed and vertical-tab delays
.lp +12 7
030000	select one of four types of carriage-return delays
.lp +12 7
006000	select one of four types of tab delays
.lp +12 7
001400	select one of four types of new-line delays
.lp +12 7
000200	even parity allowed on input
.lp +12 7
000100	odd parity allowed on input
.lp +12 7
000040	raw mode
.lp +12 7
000020	map CR into LF; echo LF or CR as CR-LF
.lp +12 7
000010	echo (full duplex)
.lp +12 7
000004	map upper case to lower on input
.lp +12 7
000002	echo and print tabs as spaces
.lp +12 7
000001	hang up (drop `data terminal ready') after last close
.i0
.s3
The delay bits specify how long
transmission stops to allow for mechanical or other movement
when certain characters are sent to the terminal.
In all cases a value of 0 indicates no delay.
.s3
Backspace delays are currently unimplemented.
.s3
Form-feed/vertical-tab delay type 1
lasts about 2 seconds.
.s3
Carriage-return delay types 1 and 2 last
about .09 seconds, and
type 3 lasts about .15 seconds.
Types 2 and 3 have the side
effect of not transmitting a carriage-return
if at the leftmost column.
.s3
New-line delay type 1 is dependent on the current column
and is tuned for the
.if t \s-2TELETYPE\s+2\(rg
.if n TELETYPE(Rg.)
Model 37.
Type 2 lasts about .03 seconds and
type 3 lasts about .15 seconds.
.s3
Tab delay type 1 is dependent on the amount of movement
and is tuned for the
.if t \s-2TELETYPE\s+2
.if n TELETYPE
Model 37.
Other types are unimplemented and are 0.
.s3
Characters with the wrong parity, as determined by bits 0200 and
0100, are ignored.
.s3
In raw mode, every character is passed immediately
to the program without waiting until a full line has been typed.
No erase or kill processing is done;
the end-of-file character (EOT), the interrupt character
(DEL) and the quit character (FS) are not treated specially.
.s3
Mode 020 causes input carriage returns to be turned into
new-lines;
input of either CR or LF causes LF-CR both to
be echoed
(used for terminals without the newline function, i.e. most).
.s3
The upper case mode is used
on terminals without lower case, see
.it tty(IV).
.s3
The hangup mode 01
causes the line to be disconnected
when the last process with the line open closes it or terminates.
It is useful when a port is to be used for some special
purpose;
for example, if it is associated
with an ACU used to place outgoing calls.
.s3
This system call is also used with certain special
files other than terminals,
and is system dependent.
.sh "SEE ALSO"
stty(I), gtty(II), tty(IV)
.sh DIAGNOSTICS
The error bit
(c-bit) is set if the file descriptor does not refer to a terminal.
From C, a negative value indicates an error.