Re: Simple serial question...

From: Alain Mosnier (alain.mosnier_at_chello.se)
Date: 11/09/05

  • Next message: Grant Edwards: "Re: Simple serial question..." 
    Date: Wed, 09 Nov 2005 15:43:05 +0100

    Grant Edwards wrote:
    > 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.
    All right, I guess I was just talking about x86 then.

    Anyway, I guess my point about byte ordering was even more relevant that
    I thought. ;-)
    >
    >
    >>>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).
    >
    Good to know. Thanks for the info.
    >
    >>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.
    >
    Do you mean that people don't know that document? I found it immediately
    at my first Google search about Linux serial programming (actually, the
    HOWTO points to it). I think that document fills a surprising hole in
    books like "Advanced programming in the UNIX environment", "Advanced
    UNIX programming" and "UNIX network programming", which are very good
    books otherwise.

    Regards,

    Alain

  • Next message: Grant Edwards: "Re: Simple serial question..."

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