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From: Stephen Leake <stephen.a.leake.1@gsfc.nasa.gov>
Newsgroups: comp.lang.ada,comp.os.vxworks
Subject: Re: redirecting the standard output
Date: 10 Apr 2001 12:08:25 -0400
Organization: NASA Goddard Space Flight Center
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Date: 2001-04-10T16:23:32+00:00
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"Martin Dowie" <martin.dowie@gecm.com> writes:

> This time with a subject... :-)
> 
> Target System: PowerPC, AdaMULTI v1.8.9b, VxWorks 5.4
> 
> How do I redirect the standard output? I'd like to redirect it to device
> "/null"

Normally this is done from the command line, when you launch your
executable. What OS are you on?


> Attempts: Open (DevNull, Append_File, "/null"); Open (DevNull,
> "/null", "/null");
> 
> just cause Status_Error, i.e. the device is already "open". So how can
> I then "Set_Output (DevNull);" without having the device object in
> File_Type form?..

You can use Ada.Text_IO.Set_Output to set the _current_ output to some
file. But it has to be an open file, and you haven't gotten there yet.

Backing up a bit, why do you want to do this? I can guess that you
want to turn off some debugging output. It is _far_ better to define a
Debug_IO package, with a Boolean or Integer debug enabled variable.
Then have a style guide that says "Ada.Text_IO is _forbidden_ in
delivered code; use Debug_IO if you need debug output".

-- 
-- Stephe