topic Re: stty in Operating System - HP-UX

stty

j773303 — Wed, 26 Nov 2003 22:14:31 GMT

"stty -a" can view interruput , del and so on setting.
Where can find the stty default configraion file?

Re: stty

Bill Hassell — Wed, 26 Nov 2003 22:31:56 GMT

The stty defaults are in the driver and set when the port is first opened. The most important is that the baud rate is always 300 until overridden. And even more important, using stty on a closed serial port will cause the changes to be made only during the duration of stty. Once the port is no longer open, the defaults are set again. The defaults are documented in the termio man page.

Re: stty

Rajeev Shukla — Wed, 26 Nov 2003 22:37:59 GMT

The best way you might want to change the stty parameters is in the .profile of the user or /etc/profile if you want for all users.

Re: stty

j773303 — Wed, 26 Nov 2003 23:06:24 GMT

When man termio, the message are too long. I'm not familar with stty and termio. Do you please tell where to define the stty defaut setting? Or any document deccription the stty default configuration?

Re: stty

Steven E. Protter — Thu, 27 Nov 2003 00:00:57 GMT

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Value of TERM has been set to "ansi".
WARNING: YOU ARE SUPERUSER !!

Thu Nov 27 06:05:05 2003:/root
[2806#] stty -a
speed 9600 baud; line = 0;
rows = 25; columns = 80
min = 4; time = 0;
intr = ^C; quit = ^\; erase = ^H; kill = ^U
eof = ^D; eol = ^@; eol2 ; swtch
stop = ^S; start = ^Q; susp = ^Z; dsusp
werase ; lnext
parenb -parodd cs7 -cstopb hupcl -cread -clocal -loblk -crts
-ignbrk brkint ignpar -parmrk -inpck istrip -inlcr -igncr icrnl -iuclc
ixon -ixany ixoff -imaxbel -rtsxoff -ctsxon -ienqak
isig icanon -iexten -xcase echo echoe echok -echonl -noflsh
-echoctl -echoprt -echoke -flusho -pendin
opost -olcuc onlcr -ocrnl -onocr -onlret -ofill -ofdel -tostop
Thu Nov 27 06:05:05 2003:/root
[2807#]

These are the defaults with one acception. Ctrl-Z stops the current task and gives me the chance to background it if I wish. Everything else is vanilla HP-UX.

Off a 11.11 System, 32 bit pretty agressively patched.

SEP

Re: stty

j773303 — Thu, 27 Nov 2003 00:20:40 GMT

Hi Steven,
What did you mean? Reboot the machine and type stty -a???

Re: stty

Elmar P. Kolkman — Thu, 27 Nov 2003 02:30:49 GMT

To view the defaults, temporarily move /etc/profile out of the way and login as a user without a .profile
Or replace /bin/stty by a script
Or do a stty -a as the first line in /etc/profile to view the settings.

It might be interesting to do this test on several connections (xterm -ls, rlogin, ssh, console, ...)

As for the default speed: it could very well be that 300 baud is the default, but as long as you have a getty running, the speed is set by getty before login is started.

Re: stty

Mark Grant — Thu, 27 Nov 2003 02:36:27 GMT

It is worth noting that for the console and serially attached terminals, and possibly even other terminals (I'm not sure) the stty settings that apply to the communication is set by "login" when it reads /etc/gettydefs.

Re: stty

Bill Hassell — Fri, 28 Nov 2003 08:50:37 GMT

Serial devices that have login capability (ie, not printers, etc) are indeed controlled by getty and the settings start with /etc/gettydefs. For the console and all login-enabled serial port, getty is started in /etc/inittab. NOTE: The default settings for terminals is more than 20 years out of date!!! The terminal settings in /etc/gettydefs (except for the console) are 9600 7bits, even parity--which is why modems and terminals seem to behave strangely using the defaults. The "H" entry in /etc/gettydefs is a good starting point for setting up hardwaired login terminals, and for modems, you can use the various entries in gettydefs except change CS7 to CS8 and decide if you want the BREAK key to change baud rates for you.

Now all the above refers to login terminals. A port that is connected to a printer or other device that is not controlled by getty will use the driver defaults which can be seen by using:

stty -a < /dev/tty0p2

or whatever port you want to check. Note that if the port is already open. HOWEVER: starting with recent patches to 11.0 and 11.11, a new device file called /dev/ttyconf now exists and it can be used to set new driver defaults for ALL terminal ports, including pty devices used in telnet connections. This is especially helpful for logins where LOGIN and PASSWORD will have the defaults are:

intr = DEL; erase = #; kill = @

That's why backspace doesn't work for login and password (you have to use # as the erase character). However, if you type this command:

stty erase "^H" kill "^U" intr "^C" eof "^D" < /dev/ttyconf

And now all tty and pty devices will have the 'expected' settings. NOTE: the /dev/console device and any alread-opened devices will not inherit the new login settings until a reboot.