minio/pkg/lock/lock_solaris.go
2017-02-08 22:27:35 -08:00

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
}