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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 pathfs
import (
"bytes"
"syscall"
"unsafe"
)
var _zero uintptr
func getXAttr(path string, attr string, dest []byte) (value []byte, err error) {
sz, err := syscall.Getxattr(path, attr, dest)
for sz > cap(dest) && err == nil {
dest = make([]byte, sz)
sz, err = syscall.Getxattr(path, attr, dest)
}
if err != nil {
return nil, err
}
return dest[:sz], err
}
func listXAttr(path string) (attributes []string, err error) {
dest := make([]byte, 0)
sz, err := syscall.Listxattr(path, dest)
if err != nil {
return nil, err
}
for sz > cap(dest) && err == nil {
dest = make([]byte, sz)
sz, err = syscall.Listxattr(path, dest)
}
if sz == 0 {
return nil, err
}
// -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, err
}
const _AT_SYMLINK_NOFOLLOW = 0x100
// Linux kernel syscall utimensat(2)
//
// Needed to implement SetAttr on symlinks correctly as only utimensat provides
// AT_SYMLINK_NOFOLLOW.
func sysUtimensat(dirfd int, pathname string, times *[2]syscall.Timespec, flags int) (err error) {
// Null-terminated version of pathname
p0, err := syscall.BytePtrFromString(pathname)
if err != nil {
return err
}
_, _, e1 := syscall.Syscall6(syscall.SYS_UTIMENSAT,
uintptr(dirfd), uintptr(unsafe.Pointer(p0)), uintptr(unsafe.Pointer(times)), uintptr(flags), 0, 0)
if e1 != 0 {
err = syscall.Errno(e1)
}
return
}
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