From: Simon Wright <simon.j.wright@mac.com>
Subject: Re: pragma Pack does not work on GNAT 5.01a for Redhat Linux.
Date: Sun, 01 Jul 2007 11:57:10 +0100
Date: 2007-07-01T11:57:10+01:00 [thread overview]
Message-ID: <m24pkobddl.fsf@mac.com> (raw)
In-Reply-To: wvbr6457t611.fsf@sun.com
Ole-Hjalmar Kristensen <ole-hjalmar.kristensen@substitute_employer_here.com> writes:
>>>>>> "SW" == Simon Wright <simon.j.wright@mac.com> writes:
You seem to have snipped the last bit that I actually did say ..
> SW> "Bob Spooner" <rls19@psu.edu> writes:
> >> "Simon Wright" <simon.j.wright@mac.com> wrote in message
> >> news:m2hcp2e4fv.fsf@mac.com...
> >>>
> >>> There's always a price to pay, of course; the packing isn't
> >>> dense, and it can be quite a challenge to work out what
> >>> bytes are actually being sent (eg, if you find yourself
> >>> having to talk to C after all).
> >>
> >> Yes, XDR takes care of things like endianness, etc. that
> >> otherwise get in the way, but as you point out, there's
> >> always a price to be paid for generality. In some cases it
> >> looks like it even will take care of differing floating point
> >> representations, although I wonder about out of range
> >> problems when converting. Isn't there an XDR library for C? I
> >> know that there is one for Fortran. I would think that as
> >> long as you have an XDR library for the language with which
> >> you need to communicate, you wouldn't have to decode the
> >> bytes yourself; or have I misunderstood what you are saying?
>
> C has had XDR and RPC at least since 1987. Try man xdr or man rpcgen
> on any unix box.
True but not helpful if one side of the interface is implemented in
Ada and the other side uses just C and sockets (and you are on the Ada
side with no influence on the protocol). VxWorks both sides would
probably add to the fun.
I realise I didn't note these extra influences in my original remarks ..
next prev parent reply other threads:[~2007-07-01 10:57 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-06-19 13:16 pragma Pack does not work on GNAT 5.01a for Redhat Linux petter_fryklund
2007-06-19 14:02 ` Georg Bauhaus
2007-06-19 14:15 ` petter_fryklund
2007-06-19 16:16 ` Jeffrey R. Carter
2007-06-19 16:23 ` Adam Beneschan
2007-06-20 15:51 ` Bob Spooner
2007-06-20 16:35 ` Adam Beneschan
2007-06-20 20:50 ` Simon Wright
2007-06-21 14:50 ` Bob Spooner
2007-06-22 5:20 ` Simon Wright
2007-06-29 10:21 ` Ole-Hjalmar Kristensen
2007-07-01 10:57 ` Simon Wright [this message]
2007-08-07 10:51 ` Ole-Hjalmar Kristensen
2007-08-10 20:36 ` Simon Wright
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