github.com/avfs/avfs@v0.33.1-0.20240303173310-c6ba67c33eb7/umask.go (about) 1 // 2 // Copyright 2023 The AVFS authors 3 // 4 // Licensed under the Apache License, Version 2.0 (the "License"); 5 // you may not use this file except in compliance with the License. 6 // You may obtain a copy of the License at 7 // 8 // http://www.apache.org/licenses/LICENSE-2.0 9 // 10 // Unless required by applicable law or agreed to in writing, software 11 // distributed under the License is distributed on an "AS IS" BASIS, 12 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 // See the License for the specific language governing permissions and 14 // limitations under the License. 15 // 16 17 package avfs 18 19 import ( 20 "io/fs" 21 "sync/atomic" 22 ) 23 24 // UMasker is the interface that wraps umask related methods. 25 type UMasker interface { 26 // SetUMask sets the file mode creation mask. 27 SetUMask(mask fs.FileMode) error 28 29 // UMask returns the file mode creation mask. 30 UMask() fs.FileMode 31 } 32 33 // UMaskFn provides UMask functions to file systems. 34 type UMaskFn struct { 35 umask fs.FileMode // umask is the user file creation mode mask. 36 } 37 38 // SetUMask sets the file mode creation mask. 39 func (umf *UMaskFn) SetUMask(mask fs.FileMode) error { 40 atomic.StoreUint32((*uint32)(&umf.umask), uint32(mask)) 41 42 return nil 43 } 44 45 // UMask returns the file mode creation mask. 46 func (umf *UMaskFn) UMask() fs.FileMode { 47 m := atomic.LoadUint32((*uint32)(&umf.umask)) 48 49 return fs.FileMode(m) 50 }