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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 fsgofer
import (
"syscall"
"unsafe"
"gvisor.googlesource.com/gvisor/pkg/abi/linux"
)
func statAt(dirFd int, name string) (syscall.Stat_t, error) {
nameBytes, err := syscall.BytePtrFromString(name)
if err != nil {
return syscall.Stat_t{}, extractErrno(err)
}
namePtr := uintptr(unsafe.Pointer(nameBytes))
var stat syscall.Stat_t
statPtr := uintptr(unsafe.Pointer(&stat))
if _, _, err := syscall.Syscall6(syscall.SYS_NEWFSTATAT, uintptr(dirFd), namePtr, statPtr, linux.AT_SYMLINK_NOFOLLOW, 0, 0); err != 0 {
return syscall.Stat_t{}, err
}
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 uintptr
if name != "" {
nameBytes, err := syscall.BytePtrFromString(name)
if err != nil {
return extractErrno(err)
}
namePtr = uintptr(unsafe.Pointer(nameBytes))
}
timesPtr := uintptr(unsafe.Pointer(×[0]))
if _, _, err := syscall.Syscall6(syscall.SYS_UTIMENSAT, uintptr(dirFd), namePtr, timesPtr, uintptr(flags), 0, 0); err != 0 {
return err
}
return nil
}
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