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// Copyright 2018 The gVisor Authors.
//
// 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 linux
import (
"gvisor.dev/gvisor/pkg/abi/linux"
"gvisor.dev/gvisor/pkg/sentry/fs"
)
// flagsToPermissions returns a Permissions object from Linux flags.
// This includes truncate permission if O_TRUNC is set in the mask.
func flagsToPermissions(mask uint) (p fs.PermMask) {
if mask&linux.O_TRUNC != 0 {
p.Write = true
}
switch mask & linux.O_ACCMODE {
case linux.O_WRONLY:
p.Write = true
case linux.O_RDWR:
p.Write = true
p.Read = true
case linux.O_RDONLY:
p.Read = true
}
return
}
// linuxToFlags converts Linux file flags to a FileFlags object.
func linuxToFlags(mask uint) fs.FileFlags {
return fs.FileFlags{
Direct: mask&linux.O_DIRECT != 0,
DSync: mask&(linux.O_DSYNC|linux.O_SYNC) != 0,
Sync: mask&linux.O_SYNC != 0,
NonBlocking: mask&linux.O_NONBLOCK != 0,
Read: (mask & linux.O_ACCMODE) != linux.O_WRONLY,
Write: (mask & linux.O_ACCMODE) != linux.O_RDONLY,
Append: mask&linux.O_APPEND != 0,
Directory: mask&linux.O_DIRECTORY != 0,
Async: mask&linux.O_ASYNC != 0,
LargeFile: mask&linux.O_LARGEFILE != 0,
Truncate: mask&linux.O_TRUNC != 0,
}
}
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