[PATCH] Use mode_t in open and friends

[Rich Felker]

On Thu, Apr 24, 2014 at 07:06:58AM -0700, Paul Eggert wrote:
> gnulib attacks this problem by defining a macro PROMOTED_MODE_T that
> expands to 'int' on platforms where mode_t is narrower than int, and
> to 'mode_t' otherwise.  This supports 'mode = va_arg (ap,
> PROMOTED_MODE_T);'.  glibc could do something similar.

I thought glibc always had mode_t with rank >= int, but if not,
something like __typeof__(+(mode_t)0) would work just fine, since
glibc depends on GNU C extensions like __typeof__ anyway.

Rich