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// Copyright 2018 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"
"gvisor.dev/gvisor/pkg/sentry/contexttest"
"gvisor.dev/gvisor/pkg/usermem"
"gvisor.dev/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")
}
}
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