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// Copyright 2015 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// +build linux
package fsnotify
import (
"testing"
"time"
"golang.org/x/sys/unix"
)
type testFd [2]int
func makeTestFd(t *testing.T) testFd {
var tfd testFd
errno := unix.Pipe(tfd[:])
if errno != nil {
t.Fatalf("Failed to create pipe: %v", errno)
}
return tfd
}
func (tfd testFd) fd() int {
return tfd[0]
}
func (tfd testFd) closeWrite(t *testing.T) {
errno := unix.Close(tfd[1])
if errno != nil {
t.Fatalf("Failed to close write end of pipe: %v", errno)
}
}
func (tfd testFd) put(t *testing.T) {
buf := make([]byte, 10)
_, errno := unix.Write(tfd[1], buf)
if errno != nil {
t.Fatalf("Failed to write to pipe: %v", errno)
}
}
func (tfd testFd) get(t *testing.T) {
buf := make([]byte, 10)
_, errno := unix.Read(tfd[0], buf)
if errno != nil {
t.Fatalf("Failed to read from pipe: %v", errno)
}
}
func (tfd testFd) close() {
unix.Close(tfd[1])
unix.Close(tfd[0])
}
func makePoller(t *testing.T) (testFd, *fdPoller) {
tfd := makeTestFd(t)
poller, err := newFdPoller(tfd.fd())
if err != nil {
t.Fatalf("Failed to create poller: %v", err)
}
return tfd, poller
}
func TestPollerWithBadFd(t *testing.T) {
_, err := newFdPoller(-1)
if err != unix.EBADF {
t.Fatalf("Expected EBADF, got: %v", err)
}
}
func TestPollerWithData(t *testing.T) {
tfd, poller := makePoller(t)
defer tfd.close()
defer poller.close()
tfd.put(t)
ok, err := poller.wait()
if err != nil {
t.Fatalf("poller failed: %v", err)
}
if !ok {
t.Fatalf("expected poller to return true")
}
tfd.get(t)
}
func TestPollerWithWakeup(t *testing.T) {
tfd, poller := makePoller(t)
defer tfd.close()
defer poller.close()
err := poller.wake()
if err != nil {
t.Fatalf("wake failed: %v", err)
}
ok, err := poller.wait()
if err != nil {
t.Fatalf("poller failed: %v", err)
}
if ok {
t.Fatalf("expected poller to return false")
}
}
func TestPollerWithClose(t *testing.T) {
tfd, poller := makePoller(t)
defer tfd.close()
defer poller.close()
tfd.closeWrite(t)
ok, err := poller.wait()
if err != nil {
t.Fatalf("poller failed: %v", err)
}
if !ok {
t.Fatalf("expected poller to return true")
}
}
func TestPollerWithWakeupAndData(t *testing.T) {
tfd, poller := makePoller(t)
defer tfd.close()
defer poller.close()
tfd.put(t)
err := poller.wake()
if err != nil {
t.Fatalf("wake failed: %v", err)
}
// both data and wakeup
ok, err := poller.wait()
if err != nil {
t.Fatalf("poller failed: %v", err)
}
if !ok {
t.Fatalf("expected poller to return true")
}
// data is still in the buffer, wakeup is cleared
ok, err = poller.wait()
if err != nil {
t.Fatalf("poller failed: %v", err)
}
if !ok {
t.Fatalf("expected poller to return true")
}
tfd.get(t)
// data is gone, only wakeup now
err = poller.wake()
if err != nil {
t.Fatalf("wake failed: %v", err)
}
ok, err = poller.wait()
if err != nil {
t.Fatalf("poller failed: %v", err)
}
if ok {
t.Fatalf("expected poller to return false")
}
}
func TestPollerConcurrent(t *testing.T) {
tfd, poller := makePoller(t)
defer tfd.close()
defer poller.close()
oks := make(chan bool)
live := make(chan bool)
defer close(live)
go func() {
defer close(oks)
for {
ok, err := poller.wait()
if err != nil {
t.Fatalf("poller failed: %v", err)
}
oks <- ok
if !<-live {
return
}
}
}()
// Try a write
select {
case <-time.After(50 * time.Millisecond):
case <-oks:
t.Fatalf("poller did not wait")
}
tfd.put(t)
if !<-oks {
t.Fatalf("expected true")
}
tfd.get(t)
live <- true
// Try a wakeup
select {
case <-time.After(50 * time.Millisecond):
case <-oks:
t.Fatalf("poller did not wait")
}
err := poller.wake()
if err != nil {
t.Fatalf("wake failed: %v", err)
}
if <-oks {
t.Fatalf("expected false")
}
live <- true
// Try a close
select {
case <-time.After(50 * time.Millisecond):
case <-oks:
t.Fatalf("poller did not wait")
}
tfd.closeWrite(t)
if !<-oks {
t.Fatalf("expected true")
}
tfd.get(t)
}
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