1 files changed, 75 insertions, 0 deletions
diff --git a/pkg/eventfd/eventfd_test.go b/pkg/eventfd/eventfd_test.go
new file mode 100644
index 000000000..96998d530
--- /dev/null
+++ b/pkg/eventfd/eventfd_test.go
@@ -0,0 +1,75 @@
+// Copyright 2021 The gVisor Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package eventfd
+
+import (
+	"testing"
+	"time"
+)
+
+func TestReadWrite(t *testing.T) {
+	efd, err := Create()
+	if err != nil {
+		t.Fatalf("failed to Create(): %v", err)
+	}
+	defer efd.Close()
+
+	// Make sure we can read actual values
+	const want = 343
+	if err := efd.Write(want); err != nil {
+		t.Fatalf("failed to write value: %d", want)
+	}
+
+	got, err := efd.Read()
+	if err != nil {
+		t.Fatalf("failed to read value: %v", err)
+	}
+	if got != want {
+		t.Fatalf("Read(): got %d, but wanted %d", got, want)
+	}
+}
+
+func TestWait(t *testing.T) {
+	efd, err := Create()
+	if err != nil {
+		t.Fatalf("failed to Create(): %v", err)
+	}
+	defer efd.Close()
+
+	// There's no way to test with certainty that Wait() blocks indefinitely, but
+	// as a best-effort we can wait a bit on it.
+	errCh := make(chan error)
+	go func() {
+		errCh <- efd.Wait()
+	}()
+	select {
+	case err := <-errCh:
+		t.Fatalf("Wait() returned without a call to Notify(): %v", err)
+	case <-time.After(500 * time.Millisecond):
+	}
+
+	// Notify and check that Wait() returned.
+	if err := efd.Notify(); err != nil {
+		t.Fatalf("Notify() failed: %v", err)
+	}
+	select {
+	case err := <-errCh:
+		if err != nil {
+			t.Fatalf("Read() failed: %v", err)
+		}
+	case <-time.After(5 * time.Second):
+		t.Fatalf("Read() did not return after Notify()")
+	}
+}