add exec expand module

exec/exec.go

@@ -0,0 +1,36 @@
+package exec
+
+import (
+	"os/exec"
+	"time"
+)
+
+//exec another process
+//if wait d Duration, it will kill the process
+//d is <= 0, wait forever
+func ExecTimeout(d time.Duration, name string, args ...string) error {
+	cmd := exec.Command(name, args...)
+
+	if err := cmd.Start(); err != nil {
+		return err
+	}
+
+	if d <= 0 {
+		return cmd.Wait()
+	}
+
+	done := make(chan error)
+	go func() {
+		done <- cmd.Wait()
+	}()
+
+	select {
+	case <-time.After(d):
+		cmd.Process.Kill()
+
+		//wait goroutine return
+		return <-done
+	case err := <-done:
+		return err
+	}
+}

exec/exec_test.go

@@ -0,0 +1,14 @@
+package exec
+
+import (
+	"strings"
+	"testing"
+	"time"
+)
+
+func TestExec(t *testing.T) {
+	err := ExecTimeout(1*time.Second, "sleep", "10")
+	if err != nil && !strings.Contains(err.Error(), "signal: killed") {
+		t.Fatal(err)
+	}
+}