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Date: Sat, 20 Jul 2013 14:34:45 +0300
From: Eli Zaretskii <eliz AT gnu DOT org>
Subject: Re: Set _IOERR if the file stream has been opened in wrong mode.
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> From: "Stephen J. Turnbull" <turnbull AT sk DOT tsukuba DOT ac DOT jp>
> Date: Sat, 20 Jul 2013 19:54:47 +0900
> 
> Eli Zaretskii writes:
>  > > From: "Stephen J. Turnbull" <turnbull AT sk DOT tsukuba DOT ac DOT jp>
>  > > Date: Sat, 20 Jul 2013 17:20:25 +0900
>  > > 
>  > > I would assume that
>  > > 
>  > >     ifp = fopen(infile, "r"); ofp = fopen(outfile, "w");
>  > > 
>  > > produces an unwritable and an unreadable file respectively
>  > 
>  > There's no such thing as "unreadable file" on DOS.
> 
> Sorry, I didn't mean "file" (too much Python programming, obviously),
> I meant "FILE*".  Can you read from ofp on DOS?

That last question is no longer in DOS-land, it is in the libc-land.
Because DOS knows nothing of 'FILE *'.

So we are back at square one: is there any good reason, apart of
"other libraries do that", which mandates that a FILE stream open with
"w" be unreadable?