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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>
Cc:        Ganbold <ganbold@micom.mng.net>, FreeBSD Stable Mailing List <freebsd-stable@freebsd.org>
Subject:   Re: /dev/cuad0: Device busy
Message-ID:  <20080204070832.GA97372@svzserv.kemerovo.su>
In-Reply-To: <20080204065122.GA92674@eos.sc1.parodius.com>
References:  <47A69A66.2080109@micom.mng.net> <20080204063023.GA91789@eos.sc1.parodius.com> <47A6B2AB.2060308@micom.mng.net> <20080204065122.GA92674@eos.sc1.parodius.com>

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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



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