djoreilly · August 26, 2021 16:01 · Aug 26, 2021 · Aug 26, 2021
diff --git a/interrupted.go b/interrupted.go
@@ -0,0 +1,43 @@
+package main
+
+import (
+	"fmt"
+	"os"
+	"os/exec"
+	"os/signal"
+	"syscall"
+	"time"
+)
+
+func interrupted(sigCh <-chan os.Signal) bool {
+	// non-blocking read on channel
+	select {
+	case <-sigCh:
+	default:
+		return false // channel is empty
+	}
+	return true
+}
+
+func main() {
+	sigCh := make(chan os.Signal, 1)
+	signal.Notify(sigCh, syscall.SIGINT, syscall.SIGTERM)
+
+	fmt.Println("about to sleep")
+	startTime := time.Now()
+
+	cmd := exec.Command("sleep", "5")
+	// prevent the shell from signalling children https://stackoverflow.com/a/33171307
+	cmd.SysProcAttr = &syscall.SysProcAttr{
+		Setpgid: true,
+	}
+	cmd.Run()
+
+	fmt.Printf("slept for %0.0f sec\n", time.Now().Sub(startTime).Seconds())
+
+	if interrupted(sigCh) {
+		fmt.Println("interrupted")
+	} else {
+		fmt.Println("not interrupted")
+	}
+}
diff --git a/run b/run
@@ -0,0 +1,10 @@
+$ go run interrupted.go 
+about to sleep
+^C^C^C
+slept for 5 sec
+interrupted
+
+$ go run interrupted.go 
+about to sleep
+slept for 5 sec
+not interrupted