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// 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 fs
// FileFlags encodes file flags.
type FileFlags struct {
// Direct indicates that I/O should be done directly.
Direct bool
// NonBlocking indicates that I/O should not block.
NonBlocking bool
// Sync indicates that any writes should be synchronous.
Sync bool
// Append indicates this file is append only.
Append bool
// Read indicates this file is readable.
Read bool
// Write indicates this file is writeable.
Write bool
// Pread indicates this file is readable at an arbitrary offset.
Pread bool
// Pwrite indicates this file is writable at an arbitrary offset.
Pwrite bool
// Directory indicates that this file must be a directory.
Directory bool
// Async indicates that this file sends signals on IO events.
Async bool
// LargeFile indicates that this file should be opened even if it has
// size greater than linux's off_t. When running in 64-bit mode,
// Linux sets this flag for all files. Since gVisor is only compatible
// with 64-bit Linux, it also sets this flag for all files.
LargeFile bool
}
// SettableFileFlags is a subset of FileFlags above that can be changed
// via fcntl(2) using the F_SETFL command.
type SettableFileFlags struct {
// Direct indicates that I/O should be done directly.
Direct bool
// NonBlocking indicates that I/O should not block.
NonBlocking bool
// Append indicates this file is append only.
Append bool
// Async indicates that this file sends signals on IO events.
Async bool
}
// Settable returns the subset of f that are settable.
func (f FileFlags) Settable() SettableFileFlags {
return SettableFileFlags{
Direct: f.Direct,
NonBlocking: f.NonBlocking,
Append: f.Append,
Async: f.Async,
}
}
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