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//go:build windows
package rawfilelock
import (
"golang.org/x/sys/windows"
)
const (
reserved = 0
allBytes = ^uint32(0)
)
type fileHandle windows.Handle
func openHandle(path string, mode int) (fileHandle, error) {
mode |= windows.O_CLOEXEC
fd, err := windows.Open(path, mode, windows.S_IWRITE)
return fileHandle(fd), err
}
func lockHandle(fd fileHandle, lType LockType, nonblocking bool) error {
flags := 0
if lType != ReadLock {
flags = windows.LOCKFILE_EXCLUSIVE_LOCK
}
if nonblocking {
flags |= windows.LOCKFILE_FAIL_IMMEDIATELY
}
ol := new(windows.Overlapped)
if err := windows.LockFileEx(windows.Handle(fd), uint32(flags), reserved, allBytes, allBytes, ol); err != nil {
if nonblocking {
return err
}
panic(err)
}
return nil
}
func unlockAndCloseHandle(fd fileHandle) {
ol := new(windows.Overlapped)
windows.UnlockFileEx(windows.Handle(fd), reserved, allBytes, allBytes, ol)
closeHandle(fd)
}
func closeHandle(fd fileHandle) {
windows.Close(windows.Handle(fd))
}
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