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From: RayeR <glaux AT centrum DOT cz>
Newsgroups: comp.os.msdos.djgpp
Subject: What DOS call is used by libc/fopen("w") and fprints() in djgpp 2.04 beta?
Date: Wed, 16 Mar 2011 02:07:00 -0700 (PDT)
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To: djgpp AT delorie DOT com
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Reply-To: djgpp AT delorie DOT com

Hi,
I'm trying to track another problem in freedos and need to trace what
dos calls are used in this operation. My original message:

Hi,
I tested my program (compiled in djgpp) on write-protected floppy and
found there's very different behavior what happen if run under msdos
and freedos 2038.
Under msdos I got null pointer as expected according to ansi c spec.
If I then tried to write to NULL by fwrite() program crashed.
Under freedos it opened something (NUL device?) and fopen returned a
valid pointer. fwrite() didn't crashed, fclose() didn't return error.
But of course file was not created. I think this is a bad idea because
application may confuse user with notification that file was
successfully created blabla and it isn't. I would suggest to return
null as ususal...