tokio: expose signal feature (#1491)

Expose tokio_net::signal::ctrl_c via tokio::net::signal::ctrl_c as feature signal.

tokio/Cargo.toml

@@ -48,6 +48,7 @@ rt-full = [
   "tokio-macros",
   "tracing-core",
 ]
+signal = ["tokio-net/signal"]
 sync = ["tokio-sync"]
 tcp = ["io", "tokio-net/tcp"]
 timer = ["tokio-timer"]

tokio/src/net.rs

@@ -57,6 +57,14 @@ pub mod udp {
 #[cfg(feature = "udp")]
 pub use self::udp::{UdpFramed, UdpSocket};
 
+#[cfg(feature = "signal")]
+pub mod signal {
+    //! Asynchronous signal handling for `tokio`. ctrl-C notifications are
+    //! supported on both unix and windows systems. For finer grained signal
+    //! handling support on unix systems, see `tokio_net::signal::unix::Signal`.
+    pub use tokio_net::signal::ctrl_c;
+}
+
 #[cfg(all(unix, feature = "uds"))]
 pub mod unix {
     //! Unix domain socket bindings for `tokio` (only available on unix systems).