71 lines
1.8 KiB
Go
71 lines
1.8 KiB
Go
// Copyright 2018 The gVisor Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package host
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import (
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"syscall"
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"testing"
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"time"
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"gvisor.dev/gvisor/pkg/sentry/context/contexttest"
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"gvisor.dev/gvisor/pkg/sentry/fs"
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"gvisor.dev/gvisor/pkg/waiter"
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)
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func TestWait(t *testing.T) {
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var fds [2]int
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err := syscall.Pipe(fds[:])
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if err != nil {
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t.Fatalf("Unable to create pipe: %v", err)
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}
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defer syscall.Close(fds[1])
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ctx := contexttest.Context(t)
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file, err := NewFile(ctx, fds[0], fs.RootOwner)
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if err != nil {
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syscall.Close(fds[0])
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t.Fatalf("NewFile failed: %v", err)
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}
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defer file.DecRef()
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r := file.Readiness(waiter.EventIn)
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if r != 0 {
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t.Fatalf("File is ready for read when it shouldn't be.")
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}
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e, ch := waiter.NewChannelEntry(nil)
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file.EventRegister(&e, waiter.EventIn)
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defer file.EventUnregister(&e)
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// Check that there are no notifications yet.
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if len(ch) != 0 {
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t.Fatalf("Channel is non-empty")
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}
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// Write to the pipe, so it should be writable now.
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syscall.Write(fds[1], []byte{1})
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// Check that we get a notification. We need to yield the current thread
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// so that the fdnotifier can deliver notifications, so we use a
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// 1-second timeout instead of just checking the length of the channel.
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select {
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case <-ch:
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case <-time.After(1 * time.Second):
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t.Fatalf("Channel not notified")
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}
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}
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