go.etcd.io/etcd@v3.3.27+incompatible/pkg/fileutil/lock_solaris.go (about) 1 // Copyright 2015 The etcd Authors 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 // +build solaris 16 17 package fileutil 18 19 import ( 20 "os" 21 "syscall" 22 ) 23 24 func TryLockFile(path string, flag int, perm os.FileMode) (*LockedFile, error) { 25 var lock syscall.Flock_t 26 lock.Start = 0 27 lock.Len = 0 28 lock.Pid = 0 29 lock.Type = syscall.F_WRLCK 30 lock.Whence = 0 31 lock.Pid = 0 32 f, err := os.OpenFile(path, flag, perm) 33 if err != nil { 34 return nil, err 35 } 36 if err := syscall.FcntlFlock(f.Fd(), syscall.F_SETLK, &lock); err != nil { 37 f.Close() 38 if err == syscall.EAGAIN { 39 err = ErrLocked 40 } 41 return nil, err 42 } 43 return &LockedFile{f}, nil 44 } 45 46 func LockFile(path string, flag int, perm os.FileMode) (*LockedFile, error) { 47 var lock syscall.Flock_t 48 lock.Start = 0 49 lock.Len = 0 50 lock.Pid = 0 51 lock.Type = syscall.F_WRLCK 52 lock.Whence = 0 53 f, err := os.OpenFile(path, flag, perm) 54 if err != nil { 55 return nil, err 56 } 57 if err = syscall.FcntlFlock(f.Fd(), syscall.F_SETLKW, &lock); err != nil { 58 f.Close() 59 return nil, err 60 } 61 return &LockedFile{f}, nil 62 }