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Date: Mon, 4 Feb 2008 14:08:32 +0700
From: Eugene Grosbein <eugen@kuzbass.ru>
To: Jeremy Chadwick <koitsu@freebsd.org>
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Cc: Ganbold <ganbold@micom.mng.net>,
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Subject: Re: /dev/cuad0: Device busy
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> Personally, I never understood the concept of "dial-in" and "call-out"
> devices on FreeBSD.  I ran BBS software for years on both Apple II
> hardware and PC hardware; there was no distinction between such devices.
> A serial port is a serial port.  Chances are I'm not understanding why
> there's a distinction, but there doesn't appear to be any explanation of
> why there's a distinction within manpages or the handbook...

The distinction exists to allow an application to wait on the "dial-in"
port for incoming calls and another application to make outgoing call
mean time using the same port as "call-out" while the port is idle.

Eugene Grosbein