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