Date: Thu, 21 Sep 2006 11:09:04 -0500 From: Dan Nelson <dnelson@allantgroup.com> To: Anton Shterenlikht <mexas@bristol.ac.uk> Cc: freebsd-questions@freebsd.org Subject: Re: what happened to /dev/cuaa0 Message-ID: <20060921160904.GB73717@dan.emsphone.com> In-Reply-To: <20060921153727.GA20997@mech-aslap33.men.bris.ac.uk> References: <6.2.5.6.1.20060921193135.0308c080@singnet.com.sg> <20060921150005.GA73717@dan.emsphone.com> <20060921153727.GA20997@mech-aslap33.men.bris.ac.uk>
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In the last episode (Sep 21), Anton Shterenlikht said: > After reading Section 22.2.2.2.2 of the Handbook my understaning is > that the same serial port can be addressed as either /dev/ttydN or > /dev/cuadN. Is that correct? Yes. > I'm confused by the "Call-in" - "Call-out" terminology. I have an > external modem connected to 1st serial port, and I use it as > /dev/ttyd0. Does it mean it becomes a call-in device? The only real difference between the devices is that call-in devices block when you try to open them, and unblock when carrier is detected (i.e. if someone calls into the modem and it's set to auto-answer). When a process is blocked, another process can "steal" the port by opening the callout device, which doesn't block. It's described in the sio manpage, too. -- Dan Nelson dnelson@allantgroup.com
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