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From: =?utf-8?Q?Yannick_Duch=C3=AAne_=28Hibou57?=
 =?utf-8?Q?=29?=
 <yannick_duchene@yahoo.fr>
Newsgroups: comp.lang.ada
Subject: Re: Asynchronous I/O on a serial device
Date: Sun, 12 Jun 2011 07:42:44 +0200
Organization: Ada @ Home
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Date: 2011-06-12T07:42:44+02:00
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Le Sat, 11 Jun 2011 23:46:47 +0200, Kim Rostgaard Christensen  =

<krc@retrospekt.dk> a =C3=A9crit:

> Hi there
Hi you :)

> 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
Not good in my opinion (see later)

> 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.
I do not know about your device node, so I could not say if its writable=
  =

or not, but note you also have Inout_File in Ada (do not know what it  =

named Inout_File instead of In_Out_File, but that's another story) besid=
e  =

of In_File, so could perfectly have input and output on the file.

> Do I need to implement this more system-near/specific, or is there som=
e  =

> way I can do bi-directional communication like, for instance two file =
 =

> handles. (I tried Form =3D> "shared=3Dyes", and it also failed).
I would not say more system specific, but rather more close to some  =

implicit specifications here: I am not sure you have good reasons [*] to=
  =

use Text_IO, and you may better have a file of some basic type, like byt=
es  =

or characters (well, a file of the more atomic type your protocol define=
s).

[*] If something is missing we do not know, tell us.

-- =

=E2=80=9CSyntactic sugar causes cancer of the semi-colons.=E2=80=9D  [Ep=
igrams on  =

Programming =E2=80=94 Alan J. =E2=80=94 P. Yale University]
=E2=80=9CStructured Programming supports the law of the excluded muddle.=
=E2=80=9D [Idem]
=E2=80=9Cc++; /* this makes c bigger but returns the old value */=E2=80=9D=
 [Anonymous]