From: "Ben Peddell" <lightspeed85 AT hotmail DOT com>
Newsgroups: comp.os.msdos.djgpp
References: <b2v0tc02dt0 AT enews4 DOT newsguy DOT com>
Subject: Re: call to 'open' causes all sleeping drives to awaken!
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Date: Wed, 19 Feb 2003 22:17:54 +1000
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To: djgpp AT delorie DOT com
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Reply-To: djgpp AT delorie DOT com

Sander Pool <sander DOT biteme AT biteme DOT sanders-stuff DOT com> wrote in message
news:b2v0tc02dt0 AT enews4 DOT newsguy DOT com...
> Hello,
>
> I noticed when I used a program compiled with DJGPP that all sleeping
drives
> in my system spin up. I examined the code and it only uses the 'open' call
> to create file descriptors. So I wrote a tiny test program:
>
> #include <fcntl.h>
>
> main()
> {
>     int f;
>     f = open("c:\\temp\\t.txt", O_RDONLY);
>     return 0;
> }
>
> This compiles fine with gcc test.c. I wait for my drives to spin down and
> then I run this program. I can hear each drive in turn spin up while the
> program waits for this to happen.

Why not find out whether the drives are spinning-up before or after the
open() is issued, by printing something before the open(), and waiting for
user input.
If it is occurring before the open(), then it is probably the stub loader
searching for CWSDPMI.EXE on the path. If you don't want this to happen,
then ensure that DPMI is active before running the program.


>
> I compiled the same using MinGW and it does not behave this way.
>
> Has anyone else noticed this? It's reason enough for me to forgo DJGPP and
> use MinGW instead.
>
>     Sander
>
> PS djgpp gcc behaves the same way, it spins up all drives before starting
> the compile. Of course if the drives are already spinning you won't notice
> this.
>
> PPS Win2K
>
>