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// Copyright 2018 Google LLC
//
// 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 fsgofer
import (
"syscall"
"unsafe"
"gvisor.googlesource.com/gvisor/pkg/abi/linux"
"gvisor.googlesource.com/gvisor/pkg/syserr"
)
func statAt(dirFd int, name string) (syscall.Stat_t, error) {
nameBytes, err := syscall.BytePtrFromString(name)
if err != nil {
return syscall.Stat_t{}, err
}
namePtr := unsafe.Pointer(nameBytes)
var stat syscall.Stat_t
statPtr := unsafe.Pointer(&stat)
if _, _, errno := syscall.Syscall6(
syscall.SYS_NEWFSTATAT,
uintptr(dirFd),
uintptr(namePtr),
uintptr(statPtr),
linux.AT_SYMLINK_NOFOLLOW,
0,
0); errno != 0 {
return syscall.Stat_t{}, syserr.FromHost(errno).ToError()
}
return stat, nil
}
func utimensat(dirFd int, name string, times [2]syscall.Timespec, flags int) error {
// utimensat(2) doesn't accept empty name, instead name must be nil to make it
// operate directly on 'dirFd' unlike other *at syscalls.
var namePtr unsafe.Pointer
if name != "" {
nameBytes, err := syscall.BytePtrFromString(name)
if err != nil {
return err
}
namePtr = unsafe.Pointer(nameBytes)
}
timesPtr := unsafe.Pointer(×[0])
if _, _, errno := syscall.Syscall6(
syscall.SYS_UTIMENSAT,
uintptr(dirFd),
uintptr(namePtr),
uintptr(timesPtr),
uintptr(flags),
0,
0); errno != 0 {
return syserr.FromHost(errno).ToError()
}
return nil
}
func renameat(oldDirFD int, oldName string, newDirFD int, newName string) error {
var oldNamePtr unsafe.Pointer
if oldName != "" {
nameBytes, err := syscall.BytePtrFromString(oldName)
if err != nil {
return err
}
oldNamePtr = unsafe.Pointer(nameBytes)
}
var newNamePtr unsafe.Pointer
if newName != "" {
nameBytes, err := syscall.BytePtrFromString(newName)
if err != nil {
return err
}
newNamePtr = unsafe.Pointer(nameBytes)
}
if _, _, errno := syscall.Syscall6(
syscall.SYS_RENAMEAT,
uintptr(oldDirFD),
uintptr(oldNamePtr),
uintptr(newDirFD),
uintptr(newNamePtr),
0,
0); errno != 0 {
return syserr.FromHost(errno).ToError()
}
return nil
}
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