fflush() on readonly files

[Andrey Chernov]

On Sat, Jun 19, 2004 at 10:01:49PM +1000, Tim Robbins wrote:
> This has already been discussed:
> - Microsoft libraries and other libraries imitating them discard buffered
>   input data (like fpurge().)

Damn them.

> - UNIX libc (at least 7th ed.), Solaris libc, GNU libc and products derived
>   from P.J. Plauger's C library (e.g. QNX) do nothing and indicate success.

We need to do the same again (at least until some standard says 
otherwise).

> - BSD since Torek's stdio rewrite (inc. FreeBSD and Mac OS X) indicate
>   an error.

We need to fix just fflush() case only, left other rewrite parts 
untouched.

if ((fp->_flags & (__SWR | __SRW)) == 0) 
	retval = 0;

> There is no reason to change from the perfectly correct & well-documented
> behaviour BSD has had for 10-15 years. The original poster's example provides
> a good argument for this: it detects application bugs.

I agree.

-- 
Andrey Chernov | http://ache.pp.ru/