Re: fileno(tmpfile()) returns EBADF

[Marcus Brinkmann]

On Fri, Apr 19, 2002 at 07:36:33PM -0400, Roland McGrath wrote:
> > Sure, but there is *no* difference between doing so immediately and
> > doing so upon demand...
> 
> Sure there is.  The basic requirement here is that the the OPEN_MAX limit
> be enforced as specified,

I don't have my copy of POSIX around, but I also remember a vague
requirement (or expectation) that the file descriptor allocated
is always the smallest file descriptor available.  So a program
that does close(0); tmpfile(); might expect to have the file descriptor
allocated for tmpfile to be 0.  Keeping track of this in a delayed
allocation is hairy.

But as I said, I am a filesystem-size-limitation away from the standard
document, so I can't check right now.  Compiling emacs and glibc is more
important (so I can check your patch ;).

Thanks,
Marcus