Rewrite NIO Pipe to use socketpair(2).

Our Pipe originally used socket(2) to create AF_INET/AF_INET6
sockets. This was clearly a bad idea.

I rewrote it to use socketpair(2) and AF_UNIX, but this was
before the big "expose POSIX" rewrite, so it required a bunch
of hacks in the native code, so I went with pipe(2) instead.

The trouble with pipe(2) is that we end up using FileChannel
to implement the Pipe.SinkChannel and Pipe.SourceChannel, but
the kernel won't wake a read(2) on a pipe if another thread
calls close(2) on it, so we started failing interrupt tests.

This (final?) rewrite is hopefully the best of all worlds:
we don't have any INTERNET permission needs, the code is as
simple as the pipe(2) code, and interruption works.

Bug: 7084342
Bug: 2735373
Bug: http://code.google.com/p/android/issues/detail?id=9431

(cherry picked from commit 3218082325b6b8713a8ac15731482e3da86a7df9)

Change-Id: Ib92cdf8c818f6bba1f00e191f1b624ce9e693754

0 files changed, 0 insertions, 0 deletions