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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 devpts
import (
"testing"
"gvisor.dev/gvisor/pkg/abi/linux"
"gvisor.dev/gvisor/pkg/sentry/contexttest"
"gvisor.dev/gvisor/pkg/usermem"
"gvisor.dev/gvisor/pkg/waiter"
)
func TestSimpleMasterToReplica(t *testing.T) {
ld := newLineDiscipline(linux.DefaultReplicaTermios)
ctx := contexttest.Context(t)
inBytes := []byte("hello, tty\n")
src := usermem.BytesIOSequence(inBytes)
outBytes := make([]byte, 32)
dst := usermem.BytesIOSequence(outBytes)
// Write to the input queue.
nw, err := ld.inputQueueWrite(ctx, src)
if err != nil {
t.Fatalf("error writing to input queue: %v", err)
}
if nw != int64(len(inBytes)) {
t.Fatalf("wrote wrong length: got %d, want %d", nw, len(inBytes))
}
// Read from the input queue.
nr, err := ld.inputQueueRead(ctx, dst)
if err != nil {
t.Fatalf("error reading from input queue: %v", err)
}
if nr != int64(len(inBytes)) {
t.Fatalf("read wrong length: got %d, want %d", nr, len(inBytes))
}
outStr := string(outBytes[:nr])
inStr := string(inBytes)
if outStr != inStr {
t.Fatalf("written and read strings do not match: got %q, want %q", outStr, inStr)
}
}
type callback func(*waiter.Entry, waiter.EventMask)
func (cb callback) Callback(entry *waiter.Entry, mask waiter.EventMask) {
cb(entry, mask)
}
func TestEchoDeadlock(t *testing.T) {
ctx := contexttest.Context(t)
termios := linux.DefaultReplicaTermios
termios.LocalFlags |= linux.ECHO
ld := newLineDiscipline(termios)
outBytes := make([]byte, 32)
dst := usermem.BytesIOSequence(outBytes)
entry := &waiter.Entry{Callback: callback(func(*waiter.Entry, waiter.EventMask) {
ld.inputQueueRead(ctx, dst)
})}
ld.masterWaiter.EventRegister(entry, waiter.ReadableEvents)
defer ld.masterWaiter.EventUnregister(entry)
inBytes := []byte("hello, tty\n")
n, err := ld.inputQueueWrite(ctx, usermem.BytesIOSequence(inBytes))
if err != nil {
t.Fatalf("inputQueueWrite: %v", err)
}
if int(n) != len(inBytes) {
t.Fatalf("read wrong length: got %d, want %d", n, len(inBytes))
}
outStr := string(outBytes[:n])
inStr := string(inBytes)
if outStr != inStr {
t.Fatalf("written and read strings do not match: got %q, want %q", outStr, inStr)
}
}
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