Re: Simple serial question...

From: Grant Edwards (grante_at_visi.com)
Date: 11/08/05 

Date: Tue, 08 Nov 2005 19:41:48 -0000

On 2005-11-08, Alain Mosnier <alain.mosnier@chello.se> wrote:

> Be aware of the byte ordering issue though: your source and
> destination might order the bytes differently. This is not a
> problem if both source and destination are Linux, which is
> always little-endian, as far as I know

Wha?

There are plenty of big-endian architectures running Linux:

  SPARC
  PPC
  68000
  IBM-370 (and I presume z-series),
  H8/300
  ARM
  etc.

I suspect that the majority of Linux-supporting architectures
are big-endian, even though most Linux machines are
little-endian.

>> NB: Don't use the Linux serial programming HOWTO.
>
> Just out of curiosity, why is that? Anything specific that
> would be wrong in that HOWTO?

Yes. Mainly the code used to open devices. I have vague
recollections of problems with the way some of the termios
stuff is done too, but I can't remember the details. There are
also large amounts of stuff that's just not there (e.g.
accessing modem control/status lines).

> I'm rather using the "Serial Programming Guide for POSIX
> Operating Systems" which is more recent myself, but I would
> still be interested to hear what's wrong in that HOWTO.

You're the only one, then. Corrections and entirely new
chapters have been submitted but have been ignored. 

-- 
Grant Edwards                   grante             Yow!  The PINK SOCKS were
                                  at               ORIGINALLY from 1952!! But
                               visi.com            they went to MARS around
                                                   1953!!

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