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Re: CVS commit: src/lib/libc/stdio
In article <20100506150045.GA749%marx.bitnet@localhost>,
Jukka Ruohonen <jruohonen%iki.fi@localhost> wrote:
>On Thu, May 06, 2010 at 02:48:32PM +0200, Joerg Sonnenberger wrote:
>> On Thu, May 06, 2010 at 08:51:29AM +0000, David Holland wrote:
>> > On Thu, May 06, 2010 at 08:14:08AM +0000, Jukka Ruohonen wrote:
>> > > Correct the discussion about return values: fileno() may fail and
>> > > Note that in such cases the NetBSD implementation does not set errno to
>> > > EBADF, hence diverging from the standard in this small detail.
>> > How is that not just a bug?
>> -1 is a valid answer for not file-backed FILEs. I don't think it is an
> Upon successful completion, fileno() shall return the integer value of
>the file descriptor associated with stream. Otherwise, the value -1 shall be
>returned and errno set to indicate the error.
> The fileno() function may fail if:
> The stream argument is not a valid stream, or the stream is not
> associated with a file.
>Isn't the above EBADF exactly what you are after?
Our stdio supports funopen() which has FILE *'s where fileno() == -1, but
they work just fine... This should be documented. Perhaps set errno if
it is indeed a bad file descriptor, and don't set it if it is a side-effect
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