From: Wolfgang Jung (wong@cs.tu-berlin.de)
Date: 04/14/93 

From: wong@cs.tu-berlin.de (Wolfgang Jung)
Subject: IOCTL on Serial Lines
Date: 14 Apr 1993 14:13:42 GMT

Hi
===

While I tested my mouse (Playing with thos tesutilities .
I tried to turn my mouse into MouseSzstems mode (DTR OFF it seems with my
mouse.

While doing this I added into the testprogram (derived from X} some
code to turbn off the DTR.
I obseved that DTR is always restored when a ioctl(fd,TCSETA,...} is
called. This behavior of ioctl on serial lines is nowhere dokumented
I looked at the manpages from SunOS due to unavailable ones for linux :-(

Is this a Feature or is this a BUG.
It makes it almos impossible to turn off the lines if it is needed.
(I donot now if the other lines are affected the same I have no RS232 Line
monitor :-( }

Gruss
        Wolfgang