kgio provides non-blocking I/O methods for Ruby without raising
exceptions on EAGAIN and EINPROGRESS. It is intended for use with the
Unicorn and Rainbows! Rack servers, but may be used by other
applications.

* http://bogomips.org/kgio/
* kgio@librelist.org />* git://git.bogomips.org/kgio.git

Changes:

We now avoid errno side-effects in kgio_wait_*able methods.
This affects Rubinius, but may affect other Ruby platforms
(particularly those that use stdio) as well.