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SubjectRe: Linux-2.4.20 modem control
Richard B. Johnson wrote:
> Now, the hang-up sequence appears to be queued. It can (and does)
> happen after the previous terminal owner has expired and another
> owner has opened the device. This makes /dev/ttyS0 useless for remote
> log-ins.
>
> It needs to be, that a 'close()' of a terminal, configured as a modem,
> cannot return to the caller until after the DTR has been lowered, and
> preferably, after waiting a few hundred milliseconds. Without this,
> once logged in, the modem will never disconnect so a new caller
> can't log in.

Better would be if the hang-up sequence is still queued, but a new
open() is delayed until the hangup has completed.

-- Jamie
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