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  }