Very Computer

Monday, I posted a question relating to the following:  

I'm trying to use stty to set the values of a terminal that I then
want to open with an application I've written.  

   I "stty blablabla < /dev/tty00" and when I then look at it with
"stty -a < /dev/tty00", it's values are as they were before my first
stty.  

   Several people have told me that this is the way it's supposed
to work.  As I now understand it, the stty opens the port and sets
it's values, but closes the port, undoing the changes, when it
exits.  

   I've looked at the man page for stty, and I just don't get it.  

   Is there a way to set a port's values, then open that port in
an app while preserving those values, and set additional values
with tcsetattr?  

   I've been contracted to do a small project.  I would like the
user to change the com port values without setting entries for
tcsetattr, and then recompiling.  My client wants this program to
be portable between Solaris to DOS, and I want to minimize the
volume of code in conditional compile clauses.  

                                                          Thanks
                                                          Larry

Quote:>Monday, I posted a question relating to the following:  

>I'm trying to use stty to set the values of a terminal that I then
>want to open with an application I've written.  

>   I "stty blablabla < /dev/tty00" and when I then look at it with
>"stty -a < /dev/tty00", it's values are as they were before my first
>stty.  

>   Several people have told me that this is the way it's supposed
>to work.  As I now understand it, the stty opens the port and sets
>it's values, but closes the port, undoing the changes, when it
>exits.  

>   I've looked at the man page for stty, and I just don't get it.  

Quote:

>   Is there a way to set a port's values, then open that port in
>an app while preserving those values, and set additional values
>with tcsetattr?  

--

#!/bin/sh

PORT=/dev/term/b
STTYSTUFF="igncr"

# start a background process that keeps the port open

( while true ; do ( sleep 60 ) ; done ) < $PORT > /dev/null 2> /dev/null &

# remember the process id of the above so we can kill it on exit from this

TRAPPID=$!
trap "kill -15 $TRAPPID" 0

# configure the port

stty $STTYSTUFF < $PORT

# run application

your_app_name

exit 0

--
Roger Williams, Institute of Geological & Nuclear Sciences, New Zealand