I have tried to drop DTR and RTS using
    ioctl(fd, TIOCMBIC, TIOCM_DTR)
and ioctl(fd, TIOCMBIC, TIOCM_RTS)
but two calls have absolutely no effect on the lines
 (by checking with a break-out  box).
 
If I set speed to B0 using tcsetattr both
lines are dropped but I would like to
control them individually.
 
The port is open with CLOCAL|HUPCL|CRTSCTS.
Kernel is 2.2.5 and 2.2.12 on RedHat 6.0.

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