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