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Date: Wed, 17 Jul 2013 13:51:06 -0500
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Subject: Re: Set _IOERR if the file stream has been opened in wrong mode.
From: Rugxulo <rugxulo AT gmail DOT com>
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Hi,

On Wed, Jul 17, 2013 at 10:24 AM, Eli Zaretskii <eliz AT gnu DOT org> wrote:
>> Date: Wed, 17 Jul 2013 01:01:26 +0200
>> From: Juan Manuel Guerrero <juan DOT guerrero AT gmx DOT de>
>>
>> The issue concerns the fread, fwrite, __putc and __getc functions only.
>> These functions manipulate the file stream FILE *.  Functions like read,
>> _read and dos_read are not involved because they work with the file descriptor.
>> If these functions fail due to accessing the file with wrong file mode,
>> they set the appropriate dos error number.
>> Of course, ferror can only fail for those functions that use the file stream.
>
> What standard mandates that reading from a file stream open in "w"
> mode shall set the error flag for the stream?
>
> DJGPP currently sets the EOF flag, not the error flag.  Why is that
> wrong?

Dunno, but OpenWatcom matches Linux here, surprisingly. But I'd still
assume such (mis)use of "w" is undefined behavior.