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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 host
import (
"testing"
"time"
"golang.org/x/sys/unix"
"gvisor.dev/gvisor/pkg/sentry/contexttest"
"gvisor.dev/gvisor/pkg/waiter"
)
func TestWait(t *testing.T) {
var fds [2]int
err := unix.Pipe(fds[:])
if err != nil {
t.Fatalf("Unable to create pipe: %v", err)
}
defer unix.Close(fds[1])
ctx := contexttest.Context(t)
file, err := NewFile(ctx, fds[0])
if err != nil {
unix.Close(fds[0])
t.Fatalf("NewFile failed: %v", err)
}
defer file.DecRef(ctx)
r := file.Readiness(waiter.EventIn)
if r != 0 {
t.Fatalf("File is ready for read when it shouldn't be.")
}
e, ch := waiter.NewChannelEntry(nil)
file.EventRegister(&e, waiter.EventIn)
defer file.EventUnregister(&e)
// Check that there are no notifications yet.
if len(ch) != 0 {
t.Fatalf("Channel is non-empty")
}
// Write to the pipe, so it should be writable now.
unix.Write(fds[1], []byte{1})
// Check that we get a notification. We need to yield the current thread
// so that the fdnotifier can deliver notifications, so we use a
// 1-second timeout instead of just checking the length of the channel.
select {
case <-ch:
case <-time.After(1 * time.Second):
t.Fatalf("Channel not notified")
}
}
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