add support for unix signals

examples/signals/Cargo.toml

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+[package]
+name = "signals"
+version = "0.1.0"
+authors = ["Nikolay Kim <fafhrd91@gmail.com>"]
+
+[[bin]]
+name = "server"
+path = "src/main.rs"
+
+[dependencies]
+env_logger = "*"
+futures = "0.1"
+actix = "^0.3.5"
+
+#actix-web = { git = "https://github.com/actix/actix-web.git" }
+
+actix-web = { path="../../", features=["signal"] }

examples/signals/README.md

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+
+# Signals
+
+This example shows how to handle unix signals and properly stop http server

examples/signals/src/main.rs

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+extern crate actix;
+extern crate actix_web;
+extern crate futures;
+extern crate env_logger;
+
+use actix_web::*;
+use actix::Arbiter;
+use actix::actors::signal::{ProcessSignals, Subscribe};
+
+
+fn main() {
+    ::std::env::set_var("RUST_LOG", "actix_web=info");
+    let _ = env_logger::init();
+    let sys = actix::System::new("signals-example");
+
+    let addr = HttpServer::new(|| {
+        Application::new()
+            // enable logger
+            .middleware(middleware::Logger::default())
+            .resource("/", |r| r.h(httpcodes::HTTPOk))})
+        .bind("127.0.0.1:8080").unwrap()
+        .start();
+
+    // Subscribe to unix signals
+    let signals = Arbiter::system_registry().get::<ProcessSignals>();
+    signals.send(Subscribe(addr.subscriber()));
+
+    println!("Started http server: 127.0.0.1:8080");
+    let _ = sys.run();
+}