mirror of https://github.com/k3s-io/k3s
50 lines
1.3 KiB
Go
50 lines
1.3 KiB
Go
// Copyright 2016 The etcd Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// +build !windows,!plan9,!solaris
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package fileutil
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import (
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"os"
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"syscall"
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)
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func flockTryLockFile(path string, flag int, perm os.FileMode) (*LockedFile, error) {
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f, err := os.OpenFile(path, flag, perm)
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if err != nil {
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return nil, err
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}
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if err = syscall.Flock(int(f.Fd()), syscall.LOCK_EX|syscall.LOCK_NB); err != nil {
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f.Close()
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if err == syscall.EWOULDBLOCK {
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err = ErrLocked
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}
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return nil, err
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}
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return &LockedFile{f}, nil
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}
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func flockLockFile(path string, flag int, perm os.FileMode) (*LockedFile, error) {
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f, err := os.OpenFile(path, flag, perm)
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if err != nil {
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return nil, err
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}
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if err = syscall.Flock(int(f.Fd()), syscall.LOCK_EX); err != nil {
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f.Close()
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return nil, err
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}
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return &LockedFile{f}, err
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}
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