use rb_update_max_fd() under MRI 1.9.3+
commitb42164253fa0f4c7c5749eab651c64ddd6cc906a
authorEric Wong <normalperson@yhbt.net>
Thu, 21 Jul 2011 22:57:10 +0000 (21 15:57 -0700)
committerEric Wong <normalperson@yhbt.net>
Thu, 21 Jul 2011 22:57:10 +0000 (21 15:57 -0700)
tree6d967506e8fad80ece45acb50c7b1ee0ed1d455c
parentd064ac9334be079d0e830bc2361c065cbaa52a64
use rb_update_max_fd() under MRI 1.9.3+

This helps exec() and similar methods close descriptors on
shutdown.
ext/kgio/extconf.rb
ext/kgio/kgio.h
ext/kgio/sock_for_fd.h