std: Stabilize parts of std::os::platform::io

This commit stabilizes the platform-specific `io` modules, specifically around
the traits having to do with the raw representation of each object on each
platform.

Specifically, the following material was stabilized:

* `AsRaw{Fd,Socket,Handle}`
* `RawFd` (renamed from `Fd`)
* `RawHandle` (renamed from `Handle`)
* `RawSocket` (renamed from `Socket`)
* `AsRaw{Fd,Socket,Handle}` implementations
* `std::os::{unix, windows}::io`

The following material was added as `#[unstable]`:

* `FromRaw{Fd,Socket,Handle}`
* Implementations for various primitives

There are a number of future improvements that are possible to make to this
module, but this should cover a good bit of functionality desired from these
modules for now. Some specific future additions may include:

* `IntoRawXXX` traits to consume the raw representation and cancel the
  auto-destructor.
* `Fd`, `Socket`, and `Handle` abstractions that behave like Rust objects and
  have nice methods for various syscalls.

At this time though, these are considered backwards-compatible extensions and
will not be stabilized at this time.

This commit is a breaking change due to the addition of `Raw` in from of the
type aliases in each of the platform-specific modules.

[breaking-change]

1 files changed, 18 insertions, 0 deletions

diff --git a/src/libstd/sys/common/net2.rs b/src/libstd/sys/common/net2.rs
index e213a86644f..8b54b7e6fb4 100644
--- a/src/libstd/sys/common/net2.rs
+++ b/src/libstd/sys/common/net2.rs
@@ -222,6 +222,12 @@ impl TcpStream {
     }
 }
 
+impl FromInner<Socket> for TcpStream {
+    fn from_inner(socket: Socket) -> TcpStream {
+        TcpStream { inner: socket }
+    }
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 // TCP listeners
 ////////////////////////////////////////////////////////////////////////////////
@@ -275,6 +281,12 @@ impl TcpListener {
     }
 }
 
+impl FromInner<Socket> for TcpListener {
+    fn from_inner(socket: Socket) -> TcpListener {
+        TcpListener { inner: socket }
+    }
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 // UDP
 ////////////////////////////////////////////////////////////////////////////////
@@ -387,3 +399,9 @@ impl UdpSocket {
         self.inner.duplicate().map(|s| UdpSocket { inner: s })
     }
 }
+
+impl FromInner<Socket> for UdpSocket {
+    fn from_inner(socket: Socket) -> UdpSocket {
+        UdpSocket { inner: socket }
+    }
+}