Golang syscall.CloseHandle函數代碼示例

func GetProcessNameMap() map[uint32]string {
	defer metrics("GetProcessNameMap")(time.Now())
	snapshot, err := syscall.CreateToolhelp32Snapshot(syscall.TH32CS_SNAPPROCESS, 0)
	if err != nil {
		common.Error("Fail to syscall CreateToolhelp32Snapshot: %v", err)
		return nil
	}
	defer syscall.CloseHandle(snapshot)
	var procEntry syscall.ProcessEntry32
	procEntry.Size = uint32(unsafe.Sizeof(procEntry))
	if err = syscall.Process32First(snapshot, &procEntry); err != nil {
		common.Error("Fail to syscall Process32First: %v", err)
		return nil
	}
	processNameMap := make(map[uint32]string)
	for {
		processNameMap[procEntry.ProcessID] = parseProcessName(procEntry.ExeFile)
		if err = syscall.Process32Next(snapshot, &procEntry); err != nil {
			if err == syscall.ERROR_NO_MORE_FILES {
				return processNameMap
			}
			common.Error("Fail to syscall Process32Next: %v", err)
			return nil
		}
	}
}

func (sub *Subprocess) BottomHalf(d *SubprocessData, sig chan *SubprocessResult) {
	hProcess := d.platformData.hProcess
	hJob := d.platformData.hJob
	result := &SubprocessResult{}
	var waitResult uint32
	waitResult = syscall.WAIT_TIMEOUT

	var runState runningState

	for result.SuccessCode == 0 && waitResult == syscall.WAIT_TIMEOUT {
		waitResult, _ = syscall.WaitForSingleObject(hProcess, uint32(sub.TimeQuantum.Nanoseconds()/1000000))
		if waitResult != syscall.WAIT_TIMEOUT {
			break
		}

		_ = UpdateProcessTimes(&d.platformData, result, false)
		if sub.MemoryLimit > 0 {
			UpdateProcessMemory(&d.platformData, result)
		}

		runState.Update(sub, result)
	}

	switch waitResult {
	case syscall.WAIT_OBJECT_0:
		_ = syscall.GetExitCodeProcess(hProcess, &result.ExitCode)

	case syscall.WAIT_TIMEOUT:
		for waitResult == syscall.WAIT_TIMEOUT {
			syscall.TerminateProcess(hProcess, 0)
			waitResult, _ = syscall.WaitForSingleObject(hProcess, 100)
		}
	}

	_ = UpdateProcessTimes(&d.platformData, result, true)
	UpdateProcessMemory(&d.platformData, result)

	syscall.CloseHandle(hProcess)
	if hJob != syscall.InvalidHandle {
		syscall.CloseHandle(hJob)
	}

	sub.SetPostLimits(result)
	for _ = range d.startAfterStart {
		err := <-d.bufferChan
		if err != nil {
			log.Error(err)
		}
	}

	if d.stdOut.Len() > 0 {
		result.Output = d.stdOut.Bytes()
	}
	if d.stdErr.Len() > 0 {
		result.Error = d.stdErr.Bytes()
	}

	sig <- result
}

func (d *PlatformData) terminateAndClose() (err error) {
	if err = terminateProcessLoop(d.hProcess); err != nil {
		return
	}
	syscall.CloseHandle(d.hThread)
	syscall.CloseHandle(d.hProcess)
	return
}

func RunAndCollectSysStats(cmd *exec.Cmd, res *Result, N uint64, prefix string) (string, error) {
	initJobOnce.Do(initJob)

	childMu.Lock()
	children := childProcesses
	childProcesses = []syscall.Handle{}
	childMu.Unlock()
	for _, proc := range children {
		syscall.CloseHandle(proc)
	}

	var out bytes.Buffer
	cmd.Stdout = &out
	cmd.Stderr = &out
	t0 := time.Now()
	if err := cmd.Run(); err != nil {
		return out.String(), err
	}
	t1 := time.Now()

	res.RunTime = uint64(t1.Sub(t0)) / N
	res.Metrics[prefix+"time"] = res.RunTime

	childMu.Lock()
	children = childProcesses
	childProcesses = []syscall.Handle{}
	childMu.Unlock()
	if len(children) == 0 {
		log.Printf("sysStats.Collect: no child processes?")
		return out.String(), nil
	}
	defer func() {
		for _, proc := range children {
			syscall.CloseHandle(proc)
		}
	}()
	cputime := uint64(0)
	rss := uint64(0)
	for _, proc := range children {
		var Mem PROCESS_MEMORY_COUNTERS
		if err := getProcessMemoryInfo(proc, &Mem); err != nil {
			log.Printf("GetProcessMemoryInfo failed: %v", err)
			return out.String(), nil
		}
		var CPU syscall.Rusage
		if err := syscall.GetProcessTimes(proc, &CPU.CreationTime, &CPU.ExitTime, &CPU.KernelTime, &CPU.UserTime); err != nil {
			log.Printf("GetProcessTimes failed: %v", err)
			return out.String(), nil
		}
		cputime += getCPUTime(CPU) / N
		rss += uint64(Mem.PeakWorkingSetSize)
	}

	res.Metrics[prefix+"cputime"] = cputime
	res.Metrics[prefix+"rss"] = rss
	return out.String(), nil
}

func (d *dev) Close() (err error) {
	d.Drain()
	syscall.CloseHandle(d.ev.r)
	syscall.CloseHandle(d.ev.w)
	if e := syscall.CloseHandle(d.fd); e != nil {
		err = d.error("close", e)
	}
	return nil
}

// Login and load user profile. Also, set finalizer on s to logout() above.
func (s *LoginInfo) Prepare() error {
	var err error
	if s.Username == "" {
		return nil
	}

	ec := tools.ErrorContext("LoginInfo.Prepare")

	s.HUser, err = win32.LogonUser(
		syscall.StringToUTF16Ptr(s.Username),
		syscall.StringToUTF16Ptr("."),
		syscall.StringToUTF16Ptr(s.Password),
		win32.LOGON32_LOGON_INTERACTIVE,
		win32.LOGON32_PROVIDER_DEFAULT)

	if err != nil {
		return ec.NewError(err)
	}

	s.HProfile, err = loadProfile(s.HUser, s.Username)

	if err != nil {
		syscall.CloseHandle(s.HUser)
		s.HUser = syscall.InvalidHandle
		return ec.NewError(err)
	}

	runtime.SetFinalizer(s, logout)
	return nil
}

// TODO(pknap) : doc
func (r *readdcw) loop() {
	var n, key uint32
	var overlapped *syscall.Overlapped
	for {
		err := syscall.GetQueuedCompletionStatus(r.cph, &n, &key, &overlapped, syscall.INFINITE)
		if key == stateCPClose {
			r.Lock()
			handle := r.cph
			r.cph = syscall.InvalidHandle
			r.Unlock()
			syscall.CloseHandle(handle)
			r.wg.Done()
			return
		}
		if overlapped == nil {
			// TODO: check key == rewatch delete or 0(panic)
			continue
		}
		overEx := (*overlappedEx)(unsafe.Pointer(overlapped))
		if n == 0 {
			r.loopstate(overEx)
		} else {
			r.loopevent(n, overEx)
			if err = overEx.parent.readDirChanges(); err != nil {
				// TODO: error handling
			}
		}
	}
}

func TestCreateToolhelp32Snapshot(t *testing.T) {
	handle, err := CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0)
	if err != nil {
		t.Fatal(err)
	}
	defer syscall.CloseHandle(syscall.Handle(handle))

	// Iterate over the snapshots until our PID is found.
	pid := uint32(syscall.Getpid())
	for {
		process, err := Process32Next(handle)
		if errors.Cause(err) == syscall.ERROR_NO_MORE_FILES {
			break
		}
		if err != nil {
			t.Fatal(err)
		}

		t.Logf("CreateToolhelp32Snapshot: ProcessEntry32=%v", process)

		if process.ProcessID == pid {
			assert.EqualValues(t, syscall.Getppid(), process.ParentProcessID)
			return
		}
	}

	assert.Fail(t, "Snapshot not found for PID=%v", pid)
}

// mmap memory maps a DB's data file.
// Based on: https://github.com/edsrzf/mmap-go
func mmap(db *DB, sz int) error {
	if !db.readOnly {
		// Truncate the database to the size of the mmap.
		if err := db.file.Truncate(int64(sz)); err != nil {
			return fmt.Errorf("truncate: %s", err)
		}
	}

	// Open a file mapping handle.
	sizelo := uint32(sz >> 32)
	sizehi := uint32(sz) & 0xffffffff
	h, errno := syscall.CreateFileMapping(syscall.Handle(db.file.Fd()), nil, syscall.PAGE_READONLY, sizelo, sizehi, nil)
	if h == 0 {
		return os.NewSyscallError("CreateFileMapping", errno)
	}

	// Create the memory map.
	addr, errno := syscall.MapViewOfFile(h, syscall.FILE_MAP_READ, 0, 0, uintptr(sz))
	if addr == 0 {
		return os.NewSyscallError("MapViewOfFile", errno)
	}

	// Close mapping handle.
	if err := syscall.CloseHandle(syscall.Handle(h)); err != nil {
		return os.NewSyscallError("CloseHandle", err)
	}

	// Convert to a byte array.
	db.data = ((*[maxMapSize]byte)(unsafe.Pointer(addr)))
	db.datasz = sz

	return nil
}

func (s *winSys) loadFileId() error {
	if s.path == "" {
		// already done
		return nil
	}
	s.Lock()
	defer s.Unlock()
	pathp, e := syscall.UTF16PtrFromString(s.path)
	if e != nil {
		return e
	}
	h, e := syscall.CreateFile(pathp, 0, 0, nil, syscall.OPEN_EXISTING, syscall.FILE_FLAG_BACKUP_SEMANTICS, 0)
	if e != nil {
		return e
	}
	defer syscall.CloseHandle(h)
	var i syscall.ByHandleFileInformation
	e = syscall.GetFileInformationByHandle(syscall.Handle(h), &i)
	if e != nil {
		return e
	}
	s.path = ""
	s.vol = i.VolumeSerialNumber
	s.idxhi = i.FileIndexHigh
	s.idxlo = i.FileIndexLow
	return nil
}

func Open(filename string) (mf *memfile, err error) {
	f, err := os.Open(filename)
	if err != nil {
		return nil, err
	}
	defer f.Close()
	fs, err := f.Stat()
	if err != nil {
		return nil, err
	}
	fsize := fs.Size()
	fmap, err := syscall.CreateFileMapping(syscall.Handle(f.Fd()), nil, syscall.PAGE_READONLY, 0, uint32(fsize), nil)
	if err != nil {
		return nil, err
	}
	defer syscall.CloseHandle(fmap)
	ptr, err := syscall.MapViewOfFile(fmap, syscall.FILE_MAP_READ, 0, 0, uintptr(fsize))
	if err != nil {
		return nil, err
	}
	defer func() {
		if recover() != nil {
			mf = nil
			err = errors.New("Failed option a file")
		}
	}()
	return &memfile{ptr, fsize, (*[1 << 30]byte)(unsafe.Pointer(ptr))[:fsize]}, nil
}

// munmap Windows implementation
// Based on: https://github.com/edsrzf/mmap-go
// Based on: https://github.com/boltdb/bolt/bolt_windows.go
func munmap(b []byte) (err error) {
	handleLock.Lock()
	defer handleLock.Unlock()

	addr := (uintptr)(unsafe.Pointer(&b[0]))
	if err := syscall.UnmapViewOfFile(addr); err != nil {
		return os.NewSyscallError("UnmapViewOfFile", err)
	}

	handle, ok := handleMap[addr]
	if !ok {
		// should be impossible; we would've seen the error above
		return errors.New("unknown base address")
	}
	delete(handleMap, addr)

	e := syscall.CloseHandle(syscall.Handle(handle))
	if e != nil {
		return os.NewSyscallError("CloseHandle", e)
	}

	file, ok := fileMap[addr]
	if !ok {
		// should be impossible; we would've seen the error above
		return errors.New("unknown base address")
	}
	delete(fileMap, addr)

	e = file.Close()
	if e != nil {
		return errors.New("close file" + e.Error())
	}
	return nil
}

func munmap(b []byte) (err error) {
	m := MMap(b)
	dh := m.header()

	addr := dh.Data
	length := uintptr(dh.Len)

	flush(addr, length)
	err = syscall.UnmapViewOfFile(addr)
	if err != nil {
		return err
	}

	handleLock.Lock()
	defer handleLock.Unlock()
	handle, ok := handleMap[addr]
	if !ok {
		// should be impossible; we would've errored above
		return errors.New("unknown base address")
	}
	delete(handleMap, addr)

	e := syscall.CloseHandle(syscall.Handle(handle))
	return os.NewSyscallError("CloseHandle", e)
}

func openDevice(ifPattern string) (*Interface, error) {
	createNewTAPDevice()
	handle, err := queryNetworkKey()
	if err != nil {
		Log(Error, "Failed to query Windows registry: %v", err)
		return nil, err
	}
	dev, err := queryAdapters(handle)
	if err != nil {
		Log(Error, "Failed to query network adapters: %v", err)
		return nil, err
	}
	if dev == nil {
		Log(Error, "All devices are in use")
		return nil, errors.New("No free TAP devices")
	}
	if dev.Name == "" {
		Log(Error, "Failed to query network adapters: %v", err)
		return nil, errors.New("Empty network adapter")
	}
	err = syscall.CloseHandle(handle)
	if err != nil {
		Log(Error, "Failed to close retrieved handle: %v", err)
	}

	return dev, nil
}

func mmapFile(f *os.File) mmapData {
	st, err := f.Stat()
	if err != nil {
		log.Fatal(err)
	}
	size := st.Size()
	if int64(int(size+4095)) != size+4095 {
		log.Fatalf("%s: too large for mmap", f.Name())
	}
	if size == 0 {
		return mmapData{f, nil, nil}
	}
	h, err := syscall.CreateFileMapping(syscall.Handle(f.Fd()), nil, syscall.PAGE_READONLY, uint32(size>>32), uint32(size), nil)
	if err != nil {
		log.Fatalf("CreateFileMapping %s: %v", f.Name(), err)
	}
	defer syscall.CloseHandle(syscall.Handle(h))

	addr, err := syscall.MapViewOfFile(h, syscall.FILE_MAP_READ, 0, 0, 0)
	if err != nil {
		log.Fatalf("MapViewOfFile %s: %v", f.Name(), err)
	}

	data := (*[1 << 30]byte)(unsafe.Pointer(addr))
	return mmapData{f, data[:size], data[:]}
}