Check in gVisor.

PiperOrigin-RevId: 194583126
Change-Id: Ica1d8821a90f74e7e745962d71801c598c652463

1 files changed, 78 insertions, 0 deletions

diff --git a/pkg/sentry/kernel/eventfd/eventfd_test.go b/pkg/sentry/kernel/eventfd/eventfd_test.go
new file mode 100644
index 000000000..71326b62f
--- /dev/null
+++ b/pkg/sentry/kernel/eventfd/eventfd_test.go
@@ -0,0 +1,78 @@
+// Copyright 2018 Google Inc.
+//
+// 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"
+
+	"gvisor.googlesource.com/gvisor/pkg/sentry/context/contexttest"
+	"gvisor.googlesource.com/gvisor/pkg/sentry/usermem"
+	"gvisor.googlesource.com/gvisor/pkg/waiter"
+)
+
+func TestEventfd(t *testing.T) {
+	initVals := []uint64{
+		0,
+		// Using a non-zero initial value verifies that writing to an
+		// eventfd signals when the eventfd's counter was already
+		// non-zero.
+		343,
+	}
+
+	for _, initVal := range initVals {
+		ctx := contexttest.Context(t)
+
+		// Make a new event that is writable.
+		event := New(ctx, initVal, false)
+
+		// Register a callback for a write event.
+		w, ch := waiter.NewChannelEntry(nil)
+		event.EventRegister(&w, waiter.EventIn)
+		defer event.EventUnregister(&w)
+
+		data := []byte("00000124")
+		// Create and submit a write request.
+		n, err := event.Writev(ctx, usermem.BytesIOSequence(data))
+		if err != nil {
+			t.Fatal(err)
+		}
+		if n != 8 {
+			t.Errorf("eventfd.write wrote %d bytes, not full int64", n)
+		}
+
+		// Check if the callback fired due to the write event.
+		select {
+		case <-ch:
+		default:
+			t.Errorf("Didn't get notified of EventIn after write")
+		}
+	}
+}
+
+func TestEventfdStat(t *testing.T) {
+	ctx := contexttest.Context(t)
+
+	// Make a new event that is writable.
+	event := New(ctx, 0, false)
+
+	// Create and submit an stat request.
+	uattr, err := event.Dirent.Inode.UnstableAttr(ctx)
+	if err != nil {
+		t.Fatalf("eventfd stat request failed: %v", err)
+	}
+	if uattr.Size != 0 {
+		t.Fatal("EventFD size should be 0")
+	}
+}