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From: Niklas Holsti <niklas.holsti@tidorum.invalid>
Newsgroups: comp.lang.ada
Subject: Re: Characters stream through Network Sockets (C <=> Ada)
Date: Wed, 28 Dec 2011 17:52:13 +0200
Organization: Tidorum Ltd
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Date: 2011-12-28T17:52:13+02:00
List-Id: <comp.lang.ada>

On 11-12-28 15:32 , Ada BRL wrote:
> Hello everyone!
>
> This is my problem:
> I have a C program that sends/receives data to/from an Ada program
> through Network sockets (pkg GNAT.Sockets).
>
> I can send a string from the Ada program to the C program.
>
> BUT I can't send any string (or array of chars) from the C program to
> the Ada one: the only thing that works is sending only one character
> at a time.
>
> I've tried using 'Read and 'Input member functions of several types
> (Chars, String, Interfaces.C.char_array, ...) but nothing worked.

How does the C program tell the Ada program how long the string is?

(And vice versa for the Ada-to-C sending.)

>
> The funniest thing is that inside the C program the send function
> seems to be working, since it returns the correct number of characters
> sent.

A socket has a buffer, so this just means that the characters have been 
put in the buffer on the sending side. And perhaps sent to the buffer on 
the receiving side.

> Instead, the Ada program blocks itself on 'Read (or 'Input) function
> and freezes.

This suggests that the Ada program is looking for a longer string than 
the C program has sent. See my question above.

-- 
Niklas Holsti
Tidorum Ltd
niklas holsti tidorum fi
       .      @       .