joyent/libuv — pull request #1231 by bnoordhuis (2014-04-09 11:35:26+00:00)
Title: linux: reduce file descriptor count of async pipe

Reopen one of the pipe descriptors as read/write through the procfs.
Allows us to close the original pipe file descriptors, saving a file
descriptor on kernels that don't support eventfd(2).