So what should I do to be able to use the modem after its
been used for PPP? I tried stty -a -f < /dev/ttyS1 and it
just hangs. I have :
44-> stty --version
stty (GNU sh-utils) 1.16
The man page for stty doesn't mention the -f flag.
On Sat, 24 Apr 1999, Paul Mackerras wrote:
> The tty is set -clocal so that we notice when the modem hangs up.
> When the tty is set -clocal, an open will hang waiting for the carrier
> detect (CD) signal unless the O_NDELAY flag is set in the open call.
> (That's how pppd opens it.)
>
> pppd does try to restore the terminal parameters that the tty had when
> pppd first opened it. But the way the Linux tty stuff works is that
> once the modem has signalled a hangup (by dropping CD), you can't do a
> single thing with the open file descriptor you have to the tty except
> close it. So pppd can't restore the terminal parameters (it would
> have to close and reopen the tty, which it doesn't do).
>
> The BSD stty program takes a -f flag as in:
> stty -a -f /dev/ttyxx
> which opens the tty with the O_NDELAY flag, which is the Right Thing
> for stty since you would never want stty to wait for CD.
>
> Paul.
>
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