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49 lines
1008 B
Go
49 lines
1008 B
Go
//go:build windows
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package rawfilelock
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import (
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"golang.org/x/sys/windows"
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)
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const (
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reserved = 0
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allBytes = ^uint32(0)
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)
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type fileHandle windows.Handle
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func openHandle(path string, mode int) (fileHandle, error) {
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mode |= windows.O_CLOEXEC
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fd, err := windows.Open(path, mode, windows.S_IWRITE)
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return fileHandle(fd), err
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}
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func lockHandle(fd fileHandle, lType LockType, nonblocking bool) error {
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flags := 0
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if lType != ReadLock {
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flags = windows.LOCKFILE_EXCLUSIVE_LOCK
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}
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if nonblocking {
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flags |= windows.LOCKFILE_FAIL_IMMEDIATELY
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}
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ol := new(windows.Overlapped)
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if err := windows.LockFileEx(windows.Handle(fd), uint32(flags), reserved, allBytes, allBytes, ol); err != nil {
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if nonblocking {
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return err
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}
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panic(err)
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}
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return nil
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}
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func unlockAndCloseHandle(fd fileHandle) {
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ol := new(windows.Overlapped)
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windows.UnlockFileEx(windows.Handle(fd), reserved, allBytes, allBytes, ol)
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closeHandle(fd)
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}
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func closeHandle(fd fileHandle) {
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windows.Close(windows.Handle(fd))
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}
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