fd_windows_test.go

Documentation: internal/poll

     1  // Copyright 2017 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package poll_test
     6  
     7  import (
     8  	"fmt"
     9  	"internal/poll"
    10  	"os"
    11  	"sync"
    12  	"syscall"
    13  	"testing"
    14  )
    15  
    16  type loggedFD struct {
    17  	Net string
    18  	FD  *poll.FD
    19  	Err error
    20  }
    21  
    22  var (
    23  	logMu     sync.Mutex
    24  	loggedFDs map[syscall.Handle]*loggedFD
    25  )
    26  
    27  func logFD(net string, fd *poll.FD, err error) {
    28  	logMu.Lock()
    29  	defer logMu.Unlock()
    30  
    31  	loggedFDs[fd.Sysfd] = &loggedFD{
    32  		Net: net,
    33  		FD:  fd,
    34  		Err: err,
    35  	}
    36  }
    37  
    38  func init() {
    39  	loggedFDs = make(map[syscall.Handle]*loggedFD)
    40  	*poll.LogInitFD = logFD
    41  }
    42  
    43  func findLoggedFD(h syscall.Handle) (lfd *loggedFD, found bool) {
    44  	logMu.Lock()
    45  	defer logMu.Unlock()
    46  
    47  	lfd, found = loggedFDs[h]
    48  	return lfd, found
    49  }
    50  
    51  // checkFileIsNotPartOfNetpoll verifies that f is not managed by netpoll.
    52  // It returns error, if check fails.
    53  func checkFileIsNotPartOfNetpoll(f *os.File) error {
    54  	lfd, found := findLoggedFD(syscall.Handle(f.Fd()))
    55  	if !found {
    56  		return fmt.Errorf("%v fd=%v: is not found in the log", f.Name(), f.Fd())
    57  	}
    58  	if lfd.FD.IsPartOfNetpoll() {
    59  		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)
    60  	}
    61  	return nil
    62  }
    63  
    64  func TestFileFdsAreInitialised(t *testing.T) {
    65  	exe, err := os.Executable()
    66  	if err != nil {
    67  		t.Fatal(err)
    68  	}
    69  	f, err := os.Open(exe)
    70  	if err != nil {
    71  		t.Fatal(err)
    72  	}
    73  	defer f.Close()
    74  
    75  	err = checkFileIsNotPartOfNetpoll(f)
    76  	if err != nil {
    77  		t.Fatal(err)
    78  	}
    79  }
    80  
    81  func TestSerialFdsAreInitialised(t *testing.T) {
    82  	for _, name := range []string{"COM1", "COM2", "COM3", "COM4"} {
    83  		t.Run(name, func(t *testing.T) {
    84  			h, err := syscall.CreateFile(syscall.StringToUTF16Ptr(name),
    85  				syscall.GENERIC_READ|syscall.GENERIC_WRITE,
    86  				0,
    87  				nil,
    88  				syscall.OPEN_EXISTING,
    89  				syscall.FILE_ATTRIBUTE_NORMAL|syscall.FILE_FLAG_OVERLAPPED,
    90  				0)
    91  			if err != nil {
    92  				if errno, ok := err.(syscall.Errno); ok {
    93  					switch errno {
    94  					case syscall.ERROR_FILE_NOT_FOUND,
    95  						syscall.ERROR_ACCESS_DENIED:
    96  						t.Log("Skipping: ", err)
    97  						return
    98  					}
    99  				}
   100  				t.Fatal(err)
   101  			}
   102  			f := os.NewFile(uintptr(h), name)
   103  			defer f.Close()
   104  
   105  			err = checkFileIsNotPartOfNetpoll(f)
   106  			if err != nil {
   107  				t.Fatal(err)
   108  			}
   109  		})
   110  	}
   111  }
   112
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