github.com/SagerNet/gvisor@v0.0.0-20210707092255-7731c139d75c/pkg/sentry/fs/host/util_arm64_unsafe.go (about)

     1  // Copyright 2019 The gVisor Authors.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  // +build arm64
    16  
    17  package host
    18  
    19  import (
    20  	"unsafe"
    21  
    22  	"golang.org/x/sys/unix"
    23  )
    24  
    25  func fstatat(fd int, name string, flags int) (unix.Stat_t, error) {
    26  	var stat unix.Stat_t
    27  	namePtr, err := unix.BytePtrFromString(name)
    28  	if err != nil {
    29  		return stat, err
    30  	}
    31  	_, _, errno := unix.Syscall6(
    32  		unix.SYS_FSTATAT,
    33  		uintptr(fd),
    34  		uintptr(unsafe.Pointer(namePtr)),
    35  		uintptr(unsafe.Pointer(&stat)),
    36  		uintptr(flags),
    37  		0, 0)
    38  	if errno != 0 {
    39  		return stat, errno
    40  	}
    41  	return stat, nil
    42  }