signal: Add SignalKind for registering signals more easily (#1430)

This avoids having consumers import libc for common signals, and it
improves discoverability since users need not be aware that libc
contains all supported constants.

1 files changed, 7 insertions, 10 deletions

diff --git a/tokio-signal/examples/multiple.rs b/tokio-signal/examples/multiple.rs
index 5157fb1b..7732d221 100644
--- a/tokio-signal/examples/multiple.rs
+++ b/tokio-signal/examples/multiple.rs
@@ -7,12 +7,14 @@
 #[cfg(unix)]
 mod platform {
     use futures_util::stream::{self, StreamExt};
-    use tokio_signal::unix::{Signal, SIGINT, SIGTERM};
+    use tokio_signal::unix::{Signal, SignalKind};
 
     pub async fn main() {
         // Create a stream for each of the signals we'd like to handle.
-        let sigint = Signal::new(SIGINT).unwrap().map(|_| SIGINT);
-        let sigterm = Signal::new(SIGTERM).unwrap().map(|_| SIGTERM);
+        let sigint = Signal::new(SignalKind::sigint()).unwrap().map(|_| "SIGINT");
+        let sigterm = Signal::new(SignalKind::sigterm())
+            .unwrap()
+            .map(|_| "SIGTERM");
 
         // Use the `select` combinator to merge these two streams into one
         let stream = stream::select(sigint, sigterm);
@@ -27,13 +29,8 @@ mod platform {
         let (item, _rest) = stream.into_future().await;
 
         // Figure out which signal we received
-        let item = item.ok_or("received no signal").unwrap();
-        if item == SIGINT {
-            println!("received SIGINT");
-        } else {
-            assert_eq!(item, SIGTERM);
-            println!("received SIGTERM");
-        }
+        let msg = item.ok_or("received no signal").unwrap();
+        println!("received {}", msg);
     }
 }