Date: Wed, 10 Nov 1999 01:11:57 -0800 (PST) From: Alfred Perlstein <bright@wintelcom.net> To: Mike Nowlin <mike@argos.org> Cc: freebsd-hackers@FreeBSD.ORG Subject: Re: serial (std & rocketport) ioctl? Message-ID: <Pine.BSF.4.05.9911100109290.12797-100000@fw.wintelcom.net> In-Reply-To: <Pine.LNX.4.05.9911100308210.5800-100000@jason.argos.org>
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On Wed, 10 Nov 1999, Mike Nowlin wrote:
>
> Hate to sound like a bum, but I haven't figured out enough of the kernel
> to answer this one for myself..... :)
>
> Topic: serial driver
>
> We have an application that sends (not receives) data to a serial port to
> a set of brain-dead analyzers (and other stuff). For several reasons I
> don't feel motivated enough to get into here, we can't send data to more
> than one at a time.
>
> Under Linux, there's an ioctl() you can call (don't remember which one) to
> ask the kernel if the port in question has actually completed sending the
> data that has been sent to it. Last time I checked, this only worked for
> the 8250 family of parts, and not the more "advanced" boards like Cyclades
> & RocketPort -- that ioctl didn't exist for these boards. So, I was stuck
> using standard serial boards, and using this ioctl to wait for one
> transmission to complete before starting another one to a different port.
>
> Is there anything like this under FreeBSD? The Linux machine is on its
> way out (kernel version 1.2.8(!), plus failing hardware), and we've added
> more equipment -- I'd love to use a Cyclades or RP board for this, instead
> of lots of modified serial cards, and I've been using more and more
> FreeBSD for the machines at work... (Don't get me wrong - I love Linux,
> but I trust FreeBSD more for what we do at work -- medical testing.)
We like FreeBSD as well. :)
I'm not a serial expert, but maybe the direction you need to take
is looking at /usr/include/sys/ttycom.h, several ioctl's seem to
be what you're looking for, noteably:
#define TIOCDRAIN _IO('t', 94) /* wait till output drained */
maybe that's incorrect, but i'm sure one or a combination of a few
ioctls from that header will help you out.
good luck,
-Alfred
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