139 lines
3.7 KiB
Go
139 lines
3.7 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 pipe
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import (
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"bytes"
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"testing"
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"gvisor.googlesource.com/gvisor/pkg/sentry/context/contexttest"
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"gvisor.googlesource.com/gvisor/pkg/sentry/usermem"
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"gvisor.googlesource.com/gvisor/pkg/syserror"
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"gvisor.googlesource.com/gvisor/pkg/waiter"
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)
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func TestPipeRW(t *testing.T) {
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ctx := contexttest.Context(t)
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r, w := NewConnectedPipe(ctx, 65536, 4096)
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defer r.DecRef()
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defer w.DecRef()
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msg := []byte("here's some bytes")
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wantN := int64(len(msg))
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n, err := w.Writev(ctx, usermem.BytesIOSequence(msg))
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if n != wantN || err != nil {
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t.Fatalf("Writev: got (%d, %v), wanted (%d, nil)", n, err, wantN)
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}
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buf := make([]byte, len(msg))
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n, err = r.Readv(ctx, usermem.BytesIOSequence(buf))
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if n != wantN || err != nil || !bytes.Equal(buf, msg) {
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t.Fatalf("Readv: got (%d, %v) %q, wanted (%d, nil) %q", n, err, buf, wantN, msg)
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}
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}
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func TestPipeReadBlock(t *testing.T) {
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ctx := contexttest.Context(t)
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r, w := NewConnectedPipe(ctx, 65536, 4096)
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defer r.DecRef()
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defer w.DecRef()
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n, err := r.Readv(ctx, usermem.BytesIOSequence(make([]byte, 1)))
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if n != 0 || err != syserror.ErrWouldBlock {
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t.Fatalf("Readv: got (%d, %v), wanted (0, %v)", n, err, syserror.ErrWouldBlock)
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}
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}
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func TestPipeWriteBlock(t *testing.T) {
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const atomicIOBytes = 2
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ctx := contexttest.Context(t)
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r, w := NewConnectedPipe(ctx, 10, atomicIOBytes)
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defer r.DecRef()
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defer w.DecRef()
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msg := []byte("here's some bytes")
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n, err := w.Writev(ctx, usermem.BytesIOSequence(msg))
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if wantN, wantErr := int64(atomicIOBytes), syserror.ErrWouldBlock; n != wantN || err != wantErr {
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t.Fatalf("Writev: got (%d, %v), wanted (%d, %v)", n, err, wantN, wantErr)
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}
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}
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func TestPipeWriteUntilEnd(t *testing.T) {
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const atomicIOBytes = 2
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ctx := contexttest.Context(t)
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r, w := NewConnectedPipe(ctx, atomicIOBytes, atomicIOBytes)
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defer r.DecRef()
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defer w.DecRef()
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msg := []byte("here's some bytes")
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wDone := make(chan struct{}, 0)
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rDone := make(chan struct{}, 0)
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defer func() {
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// Signal the reader to stop and wait until it does so.
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close(wDone)
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<-rDone
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}()
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go func() {
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defer close(rDone)
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// Read from r until done is closed.
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ctx := contexttest.Context(t)
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buf := make([]byte, len(msg)+1)
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dst := usermem.BytesIOSequence(buf)
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e, ch := waiter.NewChannelEntry(nil)
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r.EventRegister(&e, waiter.EventIn)
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defer r.EventUnregister(&e)
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for {
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n, err := r.Readv(ctx, dst)
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dst = dst.DropFirst64(n)
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if err == syserror.ErrWouldBlock {
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select {
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case <-ch:
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continue
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case <-wDone:
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// We expect to have 1 byte left in dst since len(buf) ==
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// len(msg)+1.
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if dst.NumBytes() != 1 || !bytes.Equal(buf[:len(msg)], msg) {
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t.Errorf("Reader: got %q (%d bytes remaining), wanted %q", buf, dst.NumBytes(), msg)
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}
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return
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}
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}
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if err != nil {
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t.Fatalf("Readv: got unexpected error %v", err)
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}
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}
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}()
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src := usermem.BytesIOSequence(msg)
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e, ch := waiter.NewChannelEntry(nil)
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w.EventRegister(&e, waiter.EventOut)
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defer w.EventUnregister(&e)
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for src.NumBytes() != 0 {
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n, err := w.Writev(ctx, src)
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src = src.DropFirst64(n)
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if err == syserror.ErrWouldBlock {
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<-ch
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continue
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}
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if err != nil {
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t.Fatalf("Writev: got (%d, %v)", n, err)
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}
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}
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}
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