Re: Callout Ports

H. Peter Anvin (hpa@transmeta.com)
24 Jun 1998 01:10:41 GMT

Followup to: <199806231917.PAA18687@dcl.MIT.EDU>
By author: "Theodore Y. Ts'o" <tytso@MIT.EDU>
In newsgroup: linux.dev.kernel
>
> Date: Tue, 23 Jun 1998 12:26:26 +0200
> From: Simon Richter <geier@psi5.com>
>
> Well, if I recall correctly, ttySx and cuax behave differently in
> some ways, at least ifcico won't work on ttyS1 here (I believe it is
> the SIGHUP sent by the tty driver after the connection is made that
> makes ifcico believe the connection dropped and hang up).
>
> The only difference between ttySx and cuax is their behaviour when the
> serial device is initially opened when CLOCAL is off and carrier detect
> is low. Opeining ttyS will block under these conditions, unless you set
> O_NONBLOCK while opening the device.
>
> - Ted
>

No, there is also the locking behaviour of /dev/cu*.

-hpa

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