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From: Simon Wright <simon@pushface.org>
Newsgroups: comp.lang.ada
Subject: Re: Gnat Sockets & Streams
Date: Sat, 15 Sep 2012 08:28:22 +0100
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Date: 2012-09-15T08:28:22+01:00
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Robert Love <rblove@airmail.net> writes:

> I've a problem with the Gnat.Sockets that is driving me crazy.  I have
> to use multicast to announce a service is available.

> When I insert this code into my actual program it works differently.
> The string comes over 1 character at at time.  I've looked over the
> code to see that I used the package exactly like the example.  I've
> had coworkers look it over.  We don't see any way the
>
>  String'Output(Channel, "Dummy Data");
>
> can output the data one character at a time.    The Output is in a
> loop and I would expect to see
>
> Dummy Data
> Dummy Data
> Dummy Data
>
> instead of
>
> D
> u
> m
> m
> y
>
> D
>
> by the receiving program.  I've also used tcpdump to see that the
> packet really contains just one character instead of there being a
> problem with the receiving progam.
>
> Is there  any way a stream can be corrupted?  Any settings parameters
> I could compile with that change the behavior?

That is, I believe, the behaviour specified by the ARM[1], paras 25..27
and 9.

This happened to me a long time ago, I thought AdaCore had implemented
an optimisation for strings.

You could try writing a new String and overriding 'Write (shouldn't need
to override 'Output, but maybe ...)

[1] http://www.ada-auth.org/standards/12rm/html/RM-13-13-2.html