Message-ID: <19971010094530.18209.qmail@hotmail.com>
From: "Alex Holden" <bigal2000 AT hotmail DOT com>
To: eliz AT is DOT elta DOT co DOT il
Cc: djgpp AT delorie DOT com
Subject: Re: Writing code for both DJGPP and Linux.
Content-Type: text/plain
Date: Fri, 10 Oct 1997 02:45:29 PDT
Precedence: bulk

Eli Zaretskii <eliz AT is DOT elta DOT co DOT il> wrote:
>On Tue, 7 Oct 1997, Hartmut Schirmer wrote:
>
>> Isolate your serial routines in one source for for DJGPP and one
>> for Linux. For Unix (incl. Linux) serial port programming see
>> 
>>   http://www.easysw.com/~mike/serial/
>
>I'd like to suggest another approach here?  Since on Linux, the 
>``correct''
>way of accessing devices is through `ioctl' and "/dev/ttyX", why not
>add this to DJGPP?  It shouldn't be too hard: all Alex has to do is >to
>use the DJGPP Filesystem Extension feature.  Using it, Alex will need
>to install a handler for several functions, like `open', `close',
>`ioctl', `lseek', `read' and `write', and when they reference
>"/dev/ttyX" file, redirect them to some serial code (e.g., Bills
>`bcserio' package which is available from the DJGPP archives).  On
>Linux, these calls will just work as usual.
>
>That way, Alex gets a portable program, while DJGPP gets
>POSIX-compliant serial port support.  And they all live happily ever
>after...

Hmm, sounds an interesting idea. I'll have a play with it over the 
weekend and let you know if I think I'll be able to do it on Monday (I 
don't have Internet access at home). If anyone else has any comments on 
whether this is feasible, a good idea, a Bad Idea(tm), or whatever, I'd 
like to hear from them.

Thanks, Alex.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|    Alex Holden- Electronics student, computer    |
|     programmer, caver, and Land Rover nut.       |
| http://www.geocities.com/CapeCanaveral/Lab/1532/ |
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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