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staros/files_windows.go

124 lines
2.6 KiB
Go

// +build windows
package staros
import (
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"b612.me/win32api"
"os"
"syscall"
"time"
)
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type FileLock struct {
filepath string
handle win32api.HANDLE
}
func GetFileCreationTime(fileinfo os.FileInfo) time.Time {
d := fileinfo.Sys().(*syscall.Win32FileAttributeData)
return time.Unix(0, d.CreationTime.Nanoseconds())
}
func GetFileAccessTime(fileinfo os.FileInfo) time.Time {
d := fileinfo.Sys().(*syscall.Win32FileAttributeData)
return time.Unix(0, d.LastAccessTime.Nanoseconds())
}
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func SetFileTimes(file *os.File, info os.FileInfo) {
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}
func SetFileTimesbyTime(file *os.File) {
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}
func (f *FileLock) openFileForLock() error {
name, err := syscall.UTF16PtrFromString(f.filepath)
if err != nil {
return err
}
handle, err := syscall.CreateFile(
name,
syscall.GENERIC_READ,
syscall.FILE_SHARE_READ,
nil,
syscall.OPEN_ALWAYS,
syscall.FILE_FLAG_OVERLAPPED|0x00000080,
0)
if err != nil {
return err
}
f.handle = win32api.HANDLE(handle)
return nil
}
func (f *FileLock) lockForTimeout(timeout time.Duration, lockType win32api.DWORD) error {
var err error
if err = f.openFileForLock(); err != nil {
return err
}
event, err := win32api.CreateEventW(nil, true, false, nil)
if err != nil {
return err
}
myEvent := &syscall.Overlapped{HEvent: syscall.Handle(event)}
defer syscall.CloseHandle(myEvent.HEvent)
_, err = win32api.LockFileEx(f.handle, lockType, 0, 1, 0, myEvent)
if err == nil {
return nil
}
if err != syscall.ERROR_IO_PENDING {
return err
}
millis := uint32(syscall.INFINITE)
if timeout >= 0 {
millis = uint32(timeout.Nanoseconds() / 1000000)
}
s, err := syscall.WaitForSingleObject(myEvent.HEvent, millis)
switch s {
case syscall.WAIT_OBJECT_0:
// success!
return nil
case syscall.WAIT_TIMEOUT:
f.Unlock()
return ERR_TIMEOUT
default:
f.Unlock()
return err
}
}
func (f *FileLock) Lock(Exclusive bool) error {
var lockType win32api.DWORD
if Exclusive {
lockType = win32api.LOCKFILE_EXCLUSIVE_LOCK
} else {
lockType = 0
}
return f.lockForTimeout(0, lockType)
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}
func (f *FileLock) LockWithTimeout(tm time.Duration, Exclusive bool) error {
var lockType win32api.DWORD
if Exclusive {
lockType = win32api.LOCKFILE_EXCLUSIVE_LOCK
} else {
lockType = 0
}
return f.lockForTimeout(tm, lockType)
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}
func (f *FileLock) LockNoBlocking(Exclusive bool) error {
var lockType win32api.DWORD
if Exclusive {
lockType = win32api.LOCKFILE_EXCLUSIVE_LOCK
} else {
lockType = 0
}
return f.lockForTimeout(0, lockType|win32api.LOCKFILE_FAIL_IMMEDIATELY)
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}
func (f *FileLock) Unlock() error {
return syscall.Close(syscall.Handle(f.handle))
}