better handling of os signals

go/weed/signal_handling.go

@@ -0,0 +1,27 @@
+// +build !plan9
+
+package main
+
+import (
+	"os"
+	"os/signal"
+	"syscall"
+)
+
+func OnInterrupt(fn func()) {
+	// deal with control+c,etc
+	signalChan := make(chan os.Signal, 1)
+	signal.Notify(signalChan,
+		os.Interrupt,
+		os.Kill,
+		syscall.SIGHUP,
+		syscall.SIGINT,
+		syscall.SIGTERM,
+		syscall.SIGQUIT)
+	go func() {
+		for _ = range signalChan {
+			fn()
+			os.Exit(0)
+		}
+	}()
+}