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From: Kim Rostgaard Christensen <krc@retrospekt.dk>
Newsgroups: comp.lang.ada
Subject: Re: Asynchronous I/O on a serial device
Date: Sun, 12 Jun 2011 09:33:24 +0200
Organization: Jacob Sparre Andersen Research & Innovation
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Date: 2011-06-12T09:33:24+02:00
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On 2011-06-12 07:23, Randy Brukardt wrote:
> "Kim Rostgaard Christensen"<krc@retrospekt.dk>  wrote in message
> news:it0noa$ce3$1@munin.nbi.dk...
>> Hi there
>>
>> I am desperately trying to implement a protocol on top of a serial
>> transport.
>>
>> I am running Debian, and for the moment using /dev/ttyACM0 for reading.
>> This works fine using standard the Text_IO package and In_File.
>> Only, when I need to write to the device It fails because It is in In_File
>> mode - Obviously.
>> Reset on the file handle gives me a USE_ERROR exception, probably due to
>> it being a special file - please correct me if I am wrong.
>
> Stream_IO allows changing the mode of an open stream (specifically to handle
> this sort of problem). But whether that is allowed in your specific compiler
> I can't say -- you'll have to experiment.
>
>                          Randy.
>
>
I'm pretty sure I tried Stream_IO and it gave me the same result - 
USE_ERROR, or something similar. The problem is that it is a special 
file. Reset works like a charm on regular files, both in Text and Stream_IO

/Kim