std: Add IntoRaw{Fd,Handle,Socket} traits

This commit is an implementation of [RFC 1174][rfc] which adds three new traits
to the standard library:

* `IntoRawFd` - implemented on Unix for all I/O types (files, sockets, etc)
* `IntoRawHandle` - implemented on Windows for files, processes, etc
* `IntoRawSocket` - implemented on Windows for networking types

[rfc]: https://github.com/rust-lang/rfcs/blob/master/text/1174-into-raw-fd-socket-handle-traits.md

Closes #27062

1 files changed, 17 insertions, 1 deletions

diff --git a/src/libstd/process.rs b/src/libstd/process.rs
index a8127b3200f..3471805b2bc 100644
--- a/src/libstd/process.rs
+++ b/src/libstd/process.rs
@@ -23,7 +23,7 @@ use path;
 use sync::mpsc::{channel, Receiver};
 use sys::pipe::{self, AnonPipe};
 use sys::process as imp;
-use sys_common::{AsInner, AsInnerMut, FromInner};
+use sys_common::{AsInner, AsInnerMut, FromInner, IntoInner};
 use thread;
 
 /// Representation of a running or exited child process.
@@ -71,6 +71,10 @@ impl AsInner<imp::Process> for Child {
     fn as_inner(&self) -> &imp::Process { &self.handle }
 }
 
+impl IntoInner<imp::Process> for Child {
+    fn into_inner(self) -> imp::Process { self.handle }
+}
+
 /// A handle to a child procesess's stdin
 #[stable(feature = "process", since = "1.0.0")]
 pub struct ChildStdin {
@@ -92,6 +96,10 @@ impl AsInner<AnonPipe> for ChildStdin {
     fn as_inner(&self) -> &AnonPipe { &self.inner }
 }
 
+impl IntoInner<AnonPipe> for ChildStdin {
+    fn into_inner(self) -> AnonPipe { self.inner }
+}
+
 /// A handle to a child procesess's stdout
 #[stable(feature = "process", since = "1.0.0")]
 pub struct ChildStdout {
@@ -109,6 +117,10 @@ impl AsInner<AnonPipe> for ChildStdout {
     fn as_inner(&self) -> &AnonPipe { &self.inner }
 }
 
+impl IntoInner<AnonPipe> for ChildStdout {
+    fn into_inner(self) -> AnonPipe { self.inner }
+}
+
 /// A handle to a child procesess's stderr
 #[stable(feature = "process", since = "1.0.0")]
 pub struct ChildStderr {
@@ -126,6 +138,10 @@ impl AsInner<AnonPipe> for ChildStderr {
     fn as_inner(&self) -> &AnonPipe { &self.inner }
 }
 
+impl IntoInner<AnonPipe> for ChildStderr {
+    fn into_inner(self) -> AnonPipe { self.inner }
+}
+
 /// The `Command` type acts as a process builder, providing fine-grained control
 /// over how a new process should be spawned. A default configuration can be
 /// generated using `Command::new(program)`, where `program` gives a path to the