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://bogomips.org/kgio.git

Changes:

recv() with MSG_PEEK for sockets is added with the try*
interface. SocketMethods#kgio_trypeek and
SocketMethods#kgio_peek or Kgio.trypeek for non-Kgio-enabled
sockets.

For Ruby 1.9 only: poll(2) is exposed via the Kgio.poll
singleton method and should provide an alternative for IO.select
users.

Both of these new features should work well on modern Unix-like
operating systems.