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From: Michael Bode <m.g.bode@web.de>
Newsgroups: comp.lang.ada
Subject: Beginners question: serial IO
Date: 05 Nov 2001 23:43:25 +0100
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Date: 2001-11-05T23:43:25+01:00
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Hi, I'm just starting with Ada and have the following problem: I tried
some file IO to/from the serial port aka /dev/ttyS? aka COMx:. I
figured that the following code works with GNAT/Linux (and
GNAT/Windows with the obvious change), but there must be a better way
of doing it:

with Text_IO; use Text_IO;

procedure IO_Test is
   Com_Port : Text_IO.File_Type;
   Answer : Character;

begin
   Create(Com_Port, Mode=>Text_IO.Out_File, Name=>"/dev/ttyS0");
   Put(Com_Port,"Hello World!");
   Close(Com_Port);

   Create(Com_Port, Mode=>Text_IO.In_File, Name=>"/dev/ttyS0");
   Get(Com_Port,Answer);
   Close(Com_Port);
end IO_Test;

Imagine some kind of program that talks to a device on the com port
constantly opening, closing and reopening /dev/ttyS0. It seems to be
impossible to assign two files of type In_File and Out_File to the same
device file. So, how do I do it then?