On Thu, 2009-01-08 at 15:36 -0500, Casey Dahlin wrote:

> Roland McGrath wrote:
> >>> Since waitfd shouldn't consume the child termination notification
> >>> waitfd should be more widely usable than the wait*() interfaces.
> > 
> > waitid can be used that way with WNOWAIT.
> 
> Yes, but waitfd does not have this flag. The reason being waitfd just
> calls waitid internally, and there is no guarantee (afaik) that
> calling waitid with WNOWAIT multiple times in succession will yield
> different results each time. This breaks the streaming behavior of the
> descriptor.
> 
This would definitely be a Nice To Have though!

Being able to use waitid() on another process of the same uid, with
WNOHANG, in a streaming fashion would be a *very* cool thing.

Scott
-- 
Scott James Remnant
scott@canonical.com