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// Copyright 2016 the Go-FUSE Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package fuse
import (
"bytes"
"syscall"
"unsafe"
)
func getxattr(path string, attr string, dest []byte) (sz int, errno int) {
pathBs, err := syscall.BytePtrFromString(path)
if err != nil {
return 0, int(syscall.EINVAL)
}
attrBs, err := syscall.BytePtrFromString(attr)
if err != nil {
return 0, int(syscall.EINVAL)
}
size, _, errNo := syscall.Syscall6(
syscall.SYS_GETXATTR,
uintptr(unsafe.Pointer(pathBs)),
uintptr(unsafe.Pointer(attrBs)),
uintptr(unsafe.Pointer(&dest[0])),
uintptr(len(dest)),
0, 0)
return int(size), int(errNo)
}
func GetXAttr(path string, attr string, dest []byte) (value []byte, errno int) {
sz, errno := getxattr(path, attr, dest)
for sz > cap(dest) && errno == 0 {
dest = make([]byte, sz)
sz, errno = getxattr(path, attr, dest)
}
if errno != 0 {
return nil, errno
}
return dest[:sz], errno
}
func listxattr(path string, dest []byte) (sz int, errno int) {
pathbs, err := syscall.BytePtrFromString(path)
if err != nil {
return 0, int(syscall.EINVAL)
}
var destPointer unsafe.Pointer
if len(dest) > 0 {
destPointer = unsafe.Pointer(&dest[0])
}
size, _, errNo := syscall.Syscall(
syscall.SYS_LISTXATTR,
uintptr(unsafe.Pointer(pathbs)),
uintptr(destPointer),
uintptr(len(dest)))
return int(size), int(errNo)
}
func ListXAttr(path string) (attributes []string, errno int) {
dest := make([]byte, 0)
sz, errno := listxattr(path, dest)
if errno != 0 {
return nil, errno
}
for sz > cap(dest) && errno == 0 {
dest = make([]byte, sz)
sz, errno = listxattr(path, dest)
}
// -1 to drop the final empty slice.
dest = dest[:sz-1]
attributesBytes := bytes.Split(dest, []byte{0})
attributes = make([]string, len(attributesBytes))
for i, v := range attributesBytes {
attributes[i] = string(v)
}
return attributes, errno
}
func Setxattr(path string, attr string, data []byte, flags int) (errno int) {
pathbs, err := syscall.BytePtrFromString(path)
if err != nil {
return int(syscall.EINVAL)
}
attrbs, err := syscall.BytePtrFromString(attr)
if err != nil {
return int(syscall.EINVAL)
}
_, _, errNo := syscall.Syscall6(
syscall.SYS_SETXATTR,
uintptr(unsafe.Pointer(pathbs)),
uintptr(unsafe.Pointer(attrbs)),
uintptr(unsafe.Pointer(&data[0])),
uintptr(len(data)),
uintptr(flags), 0)
return int(errNo)
}
func Removexattr(path string, attr string) (errno int) {
pathbs, err := syscall.BytePtrFromString(path)
if err != nil {
return int(syscall.EINVAL)
}
attrbs, err := syscall.BytePtrFromString(attr)
if err != nil {
return int(syscall.EINVAL)
}
_, _, errNo := syscall.Syscall(
syscall.SYS_REMOVEXATTR,
uintptr(unsafe.Pointer(pathbs)),
uintptr(unsafe.Pointer(attrbs)), 0)
return int(errNo)
}
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