101 lines
2.7 KiB
Go
101 lines
2.7 KiB
Go
// Copyright 2018 Google 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 linux
|
|
|
|
import (
|
|
"syscall"
|
|
|
|
"gvisor.googlesource.com/gvisor/pkg/sentry/fs"
|
|
"gvisor.googlesource.com/gvisor/pkg/sentry/kernel"
|
|
)
|
|
|
|
// 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) {
|
|
switch mask & syscall.O_ACCMODE {
|
|
case syscall.O_WRONLY:
|
|
p.Write = true
|
|
case syscall.O_RDWR:
|
|
p.Write = true
|
|
p.Read = true
|
|
case syscall.O_RDONLY:
|
|
p.Read = true
|
|
}
|
|
return
|
|
}
|
|
|
|
// fdFlagsToLinux converts a kernel.FDFlags object to a Linux representation.
|
|
func fdFlagsToLinux(flags kernel.FDFlags) (mask uint) {
|
|
if flags.CloseOnExec {
|
|
mask |= syscall.FD_CLOEXEC
|
|
}
|
|
return
|
|
}
|
|
|
|
// flagsToLinux converts a FileFlags object to a Linux representation.
|
|
func flagsToLinux(flags fs.FileFlags) (mask uint) {
|
|
if flags.Direct {
|
|
mask |= syscall.O_DIRECT
|
|
}
|
|
if flags.NonBlocking {
|
|
mask |= syscall.O_NONBLOCK
|
|
}
|
|
if flags.Sync {
|
|
mask |= syscall.O_SYNC
|
|
}
|
|
if flags.Append {
|
|
mask |= syscall.O_APPEND
|
|
}
|
|
if flags.Directory {
|
|
mask |= syscall.O_DIRECTORY
|
|
}
|
|
if flags.Async {
|
|
mask |= syscall.O_ASYNC
|
|
}
|
|
switch {
|
|
case flags.Read && flags.Write:
|
|
mask |= syscall.O_RDWR
|
|
case flags.Write:
|
|
mask |= syscall.O_WRONLY
|
|
case flags.Read:
|
|
mask |= syscall.O_RDONLY
|
|
}
|
|
return
|
|
}
|
|
|
|
// linuxToFlags converts linux file flags to a FileFlags object.
|
|
func linuxToFlags(mask uint) (flags fs.FileFlags) {
|
|
return fs.FileFlags{
|
|
Direct: mask&syscall.O_DIRECT != 0,
|
|
Sync: mask&syscall.O_SYNC != 0,
|
|
NonBlocking: mask&syscall.O_NONBLOCK != 0,
|
|
Read: (mask & syscall.O_ACCMODE) != syscall.O_WRONLY,
|
|
Write: (mask & syscall.O_ACCMODE) != syscall.O_RDONLY,
|
|
Append: mask&syscall.O_APPEND != 0,
|
|
Directory: mask&syscall.O_DIRECTORY != 0,
|
|
Async: mask&syscall.O_ASYNC != 0,
|
|
}
|
|
}
|
|
|
|
// linuxToSettableFlags converts linux file flags to a SettableFileFlags object.
|
|
func linuxToSettableFlags(mask uint) fs.SettableFileFlags {
|
|
return fs.SettableFileFlags{
|
|
Direct: mask&syscall.O_DIRECT != 0,
|
|
NonBlocking: mask&syscall.O_NONBLOCK != 0,
|
|
Append: mask&syscall.O_APPEND != 0,
|
|
Async: mask&syscall.O_ASYNC != 0,
|
|
}
|
|
}
|