1 files changed, 111 insertions, 0 deletions
diff --git a/src/internal/poll/fd_windows_test.go b/src/internal/poll/fd_windows_test.go
new file mode 100644
index 0000000..e3ca0e2
--- /dev/null
+++ b/src/internal/poll/fd_windows_test.go
@@ -0,0 +1,111 @@
+// Copyright 2017 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.
+
+package poll_test
+
+import (
+	"fmt"
+	"internal/poll"
+	"os"
+	"sync"
+	"syscall"
+	"testing"
+)
+
+type loggedFD struct {
+	Net string
+	FD  *poll.FD
+	Err error
+}
+
+var (
+	logMu     sync.Mutex
+	loggedFDs map[syscall.Handle]*loggedFD
+)
+
+func logFD(net string, fd *poll.FD, err error) {
+	logMu.Lock()
+	defer logMu.Unlock()
+
+	loggedFDs[fd.Sysfd] = &loggedFD{
+		Net: net,
+		FD:  fd,
+		Err: err,
+	}
+}
+
+func init() {
+	loggedFDs = make(map[syscall.Handle]*loggedFD)
+	*poll.LogInitFD = logFD
+}
+
+func findLoggedFD(h syscall.Handle) (lfd *loggedFD, found bool) {
+	logMu.Lock()
+	defer logMu.Unlock()
+
+	lfd, found = loggedFDs[h]
+	return lfd, found
+}
+
+// checkFileIsNotPartOfNetpoll verifies that f is not managed by netpoll.
+// It returns error, if check fails.
+func checkFileIsNotPartOfNetpoll(f *os.File) error {
+	lfd, found := findLoggedFD(syscall.Handle(f.Fd()))
+	if !found {
+		return fmt.Errorf("%v fd=%v: is not found in the log", f.Name(), f.Fd())
+	}
+	if lfd.FD.IsPartOfNetpoll() {
+		return fmt.Errorf("%v fd=%v: is part of netpoll, but should not be (logged: net=%v err=%v)", f.Name(), f.Fd(), lfd.Net, lfd.Err)
+	}
+	return nil
+}
+
+func TestFileFdsAreInitialised(t *testing.T) {
+	exe, err := os.Executable()
+	if err != nil {
+		t.Fatal(err)
+	}
+	f, err := os.Open(exe)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer f.Close()
+
+	err = checkFileIsNotPartOfNetpoll(f)
+	if err != nil {
+		t.Fatal(err)
+	}
+}
+
+func TestSerialFdsAreInitialised(t *testing.T) {
+	for _, name := range []string{"COM1", "COM2", "COM3", "COM4"} {
+		t.Run(name, func(t *testing.T) {
+			h, err := syscall.CreateFile(syscall.StringToUTF16Ptr(name),
+				syscall.GENERIC_READ|syscall.GENERIC_WRITE,
+				0,
+				nil,
+				syscall.OPEN_EXISTING,
+				syscall.FILE_ATTRIBUTE_NORMAL|syscall.FILE_FLAG_OVERLAPPED,
+				0)
+			if err != nil {
+				if errno, ok := err.(syscall.Errno); ok {
+					switch errno {
+					case syscall.ERROR_FILE_NOT_FOUND,
+						syscall.ERROR_ACCESS_DENIED:
+						t.Log("Skipping: ", err)
+						return
+					}
+				}
+				t.Fatal(err)
+			}
+			f := os.NewFile(uintptr(h), name)
+			defer f.Close()
+
+			err = checkFileIsNotPartOfNetpoll(f)
+			if err != nil {
+				t.Fatal(err)
+			}
+		})
+	}
+}