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// Copyright 2019 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.
//go:build arm64
// +build arm64
package fsutil
import (
"unsafe"
"golang.org/x/sys/unix"
"gvisor.dev/gvisor/pkg/syserr"
)
// StatAt is a convenience wrapper around fstatat(2).
func StatAt(dirFd int, name string) (unix.Stat_t, error) {
nameBytes, err := unix.BytePtrFromString(name)
if err != nil {
return unix.Stat_t{}, err
}
namePtr := unsafe.Pointer(nameBytes)
var stat unix.Stat_t
statPtr := unsafe.Pointer(&stat)
if _, _, errno := unix.Syscall6(
unix.SYS_FSTATAT,
uintptr(dirFd),
uintptr(namePtr),
uintptr(statPtr),
unix.AT_SYMLINK_NOFOLLOW,
0,
0); errno != 0 {
return unix.Stat_t{}, syserr.FromHost(errno).ToError()
}
return stat, nil
}
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