mirror of
https://github.com/netbirdio/gvisor.git
synced 2026-05-22 17:12:49 -07:00
Dean Deng
e5d97cbcc1
Simplify the canMap check. We do not have plans to allow mmap for anything beyond regular files, so we can just inline canMap() as a simple file mode check. Updates #1672. PiperOrigin-RevId: 316929654
57 lines
1.7 KiB
Go
57 lines
1.7 KiB
Go
// Copyright 2020 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 host
|
|
|
|
import (
|
|
"syscall"
|
|
|
|
"golang.org/x/sys/unix"
|
|
"gvisor.dev/gvisor/pkg/abi/linux"
|
|
"gvisor.dev/gvisor/pkg/syserror"
|
|
)
|
|
|
|
func toTimespec(ts linux.StatxTimestamp, omit bool) syscall.Timespec {
|
|
if omit {
|
|
return syscall.Timespec{
|
|
Sec: 0,
|
|
Nsec: unix.UTIME_OMIT,
|
|
}
|
|
}
|
|
return syscall.Timespec{
|
|
Sec: ts.Sec,
|
|
Nsec: int64(ts.Nsec),
|
|
}
|
|
}
|
|
|
|
func unixToLinuxStatxTimestamp(ts unix.StatxTimestamp) linux.StatxTimestamp {
|
|
return linux.StatxTimestamp{Sec: ts.Sec, Nsec: ts.Nsec}
|
|
}
|
|
|
|
func timespecToStatxTimestamp(ts unix.Timespec) linux.StatxTimestamp {
|
|
return linux.StatxTimestamp{Sec: int64(ts.Sec), Nsec: uint32(ts.Nsec)}
|
|
}
|
|
|
|
// wouldBlock returns true for file types that can return EWOULDBLOCK
|
|
// for blocking operations, e.g. pipes, character devices, and sockets.
|
|
func wouldBlock(fileType uint32) bool {
|
|
return fileType == syscall.S_IFIFO || fileType == syscall.S_IFCHR || fileType == syscall.S_IFSOCK
|
|
}
|
|
|
|
// isBlockError checks if an error is EAGAIN or EWOULDBLOCK.
|
|
// If so, they can be transformed into syserror.ErrWouldBlock.
|
|
func isBlockError(err error) bool {
|
|
return err == syserror.EAGAIN || err == syserror.EWOULDBLOCK
|
|
}
|