84 lines
1.8 KiB
Go
84 lines
1.8 KiB
Go
|
// +build solaris
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Minio Cloud Storage, (C) 2017 Minio, Inc.
|
||
|
|
*
|
||
|
|
* 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.
|
||
|
|
*/
|
||
|
|
|
||
|
|
package lock
|
||
|
|
|
||
|
|
import (
|
||
|
|
"fmt"
|
||
|
|
"os"
|
||
|
|
"syscall"
|
||
|
|
)
|
||
|
|
|
||
|
|
// LockedOpenFile - initializes a new lock and protects
|
||
|
|
// the file from concurrent access across mount points.
|
||
|
|
// This implementation doesn't support all the open
|
||
|
|
// flags and shouldn't be considered as replacement
|
||
|
|
// for os.OpenFile().
|
||
|
|
func LockedOpenFile(path string, flag int, perm os.FileMode) (*LockedFile, error) {
|
||
|
|
var lock syscall.Flock_t
|
||
|
|
lock.Start = 0
|
||
|
|
lock.Len = 0
|
||
|
|
lock.Pid = 0
|
||
|
|
|
||
|
|
var lockType int16
|
||
|
|
switch flag {
|
||
|
|
case syscall.O_RDONLY:
|
||
|
|
lockType = syscall.F_RDLCK
|
||
|
|
case syscall.O_WRONLY:
|
||
|
|
fallthrough
|
||
|
|
case syscall.O_RDWR:
|
||
|
|
fallthrough
|
||
|
|
case syscall.O_WRONLY | syscall.O_CREAT:
|
||
|
|
fallthrough
|
||
|
|
case syscall.O_RDWR | syscall.O_CREAT:
|
||
|
|
lockType = syscall.F_WRLCK
|
||
|
|
default:
|
||
|
|
return nil, fmt.Errorf("Unsupported flag (%d)", flag)
|
||
|
|
}
|
||
|
|
|
||
|
|
lock.Type = lockType
|
||
|
|
lock.Whence = 0
|
||
|
|
|
||
|
|
f, err := os.OpenFile(path, flag, perm)
|
||
|
|
if err != nil {
|
||
|
|
return nil, err
|
||
|
|
}
|
||
|
|
|
||
|
|
if err = syscall.FcntlFlock(f.Fd(), syscall.F_SETLKW, &lock); err != nil {
|
||
|
|
f.Close()
|
||
|
|
return nil, err
|
||
|
|
}
|
||
|
|
|
||
|
|
st, err := os.Stat(path)
|
||
|
|
if err != nil {
|
||
|
|
f.Close()
|
||
|
|
return nil, err
|
||
|
|
}
|
||
|
|
|
||
|
|
if st.IsDir() {
|
||
|
|
f.Close()
|
||
|
|
return nil, &os.PathError{
|
||
|
|
Op: "open",
|
||
|
|
Path: path,
|
||
|
|
Err: syscall.EISDIR,
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return &LockedFile{f}, nil
|
||
|
|
}
|