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// Copyright 2018 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// +build darwin dragonfly freebsd illumos linux netbsd openbsd
package filelock
import (
"io/fs"
"syscall"
)
type lockType int16
const (
readLock lockType = syscall.LOCK_SH
writeLock lockType = syscall.LOCK_EX
)
func lock(f File, lt lockType) (err error) {
for {
err = syscall.Flock(int(f.Fd()), int(lt))
if err != syscall.EINTR {
break
}
}
if err != nil {
return &fs.PathError{
Op: lt.String(),
Path: f.Name(),
Err: err,
}
}
return nil
}
func unlock(f File) error {
return lock(f, syscall.LOCK_UN)
}
func isNotSupported(err error) bool {
return err == syscall.ENOSYS || err == syscall.ENOTSUP || err == syscall.EOPNOTSUPP || err == ErrNotSupported
}
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