Ophestra
470e545d27
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This is a pretty solid implementation backed by robust tests, with a much cleaner interface. Signed-off-by: Ophestra <cat@gensokyo.uk>
41 lines
723 B
Go
41 lines
723 B
Go
// Copyright 2018 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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//go:build darwin || dragonfly || freebsd || illumos || linux || netbsd || openbsd
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package filelock
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import (
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"io/fs"
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"syscall"
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)
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type lockType int16
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const (
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readLock lockType = syscall.LOCK_SH
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writeLock lockType = syscall.LOCK_EX
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)
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func lock(f File, lt lockType) (err error) {
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for {
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err = syscall.Flock(int(f.Fd()), int(lt))
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if err != syscall.EINTR {
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break
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}
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}
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if err != nil {
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return &fs.PathError{
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Op: lt.String(),
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Path: f.Name(),
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Err: err,
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}
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}
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return nil
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}
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func unlock(f File) error {
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return lock(f, syscall.LOCK_UN)
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}
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