Fix TCP poll_hup test (#1106)

This updates tests to track a fix applied in Mio. Previously, Mio
incorrectly fired HUP events. This was due to Mio mapping `RDHUP` to
HUP. The test is updated to correctly generate a HUP event.

Additionally, HUP events will be removed from all platforms except for
Linux. This is caused by the inability to reliably map kqueue events to
the epoll HUP behavior.

ci/azure-cross-compile.yml

@@ -8,6 +8,9 @@ jobs:
     parameters:
       rust_version: stable
 
+  - script: sudo apt-get update
+    displayName: "apt-get update"
+
   - script: sudo apt-get install gcc-multilib
     displayName: "Install gcc-multilib"
 

tokio-tcp/Cargo.toml

@@ -31,4 +31,5 @@ futures = "0.1.19"
 
 [dev-dependencies]
 env_logger = { version = "0.5", default-features = false }
+net2 = "*"
 tokio = { version = "0.2.0", path = "../tokio" }

tokio-tcp/tests/tcp.rs

@@ -80,13 +80,14 @@ fn accept2() {
     t.join().unwrap();
 }
 
-#[cfg(unix)]
-mod unix {
+#[cfg(target_os = "linux")]
+mod linux {
     use tokio_tcp::TcpStream;
 
     use env_logger;
     use futures::{future, Future};
     use mio::unix::UnixReady;
+    use net2::TcpStreamExt;
     use tokio_io::AsyncRead;
 
     use std::io::Write;
@@ -101,6 +102,7 @@ mod unix {
         let addr = t!(srv.local_addr());
         let t = thread::spawn(move || {
             let mut client = t!(srv.accept()).0;
+            client.set_linger(Some(Duration::from_millis(0))).unwrap();
             client.write(b"hello world").unwrap();
             thread::sleep(Duration::from_millis(200));
         });