144 lines
3.3 KiB
Go
144 lines
3.3 KiB
Go
// Copyright 2016 the Go-FUSE Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package pathfs
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import (
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"bytes"
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"syscall"
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"unsafe"
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)
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var _zero uintptr
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func getXAttr(path string, attr string, dest []byte) (value []byte, err error) {
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sz, err := sysGetxattr(path, attr, dest)
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for sz > cap(dest) && err == nil {
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dest = make([]byte, sz)
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sz, err = sysGetxattr(path, attr, dest)
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}
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if err != nil {
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return nil, err
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}
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return dest[:sz], err
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}
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func listXAttr(path string) (attributes []string, err error) {
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dest := make([]byte, 0)
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sz, err := sysListxattr(path, dest)
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if err != nil {
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return nil, err
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}
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for sz > cap(dest) && err == nil {
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dest = make([]byte, sz)
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sz, err = sysListxattr(path, dest)
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}
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if sz == 0 {
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return nil, err
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}
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// -1 to drop the final empty slice.
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dest = dest[:sz-1]
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attributesBytes := bytes.Split(dest, []byte{0})
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attributes = make([]string, len(attributesBytes))
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for i, v := range attributesBytes {
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attributes[i] = string(v)
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}
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return attributes, err
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}
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// Below is cut & paste from std lib syscall, so gccgo 4.8.1 can
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// compile this too.
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func sysGetxattr(path string, attr string, dest []byte) (sz int, err error) {
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var _p0 *byte
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_p0, err = syscall.BytePtrFromString(path)
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if err != nil {
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return
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}
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var _p1 *byte
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_p1, err = syscall.BytePtrFromString(attr)
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if err != nil {
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return
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}
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var _p2 unsafe.Pointer
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if len(dest) > 0 {
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_p2 = unsafe.Pointer(&dest[0])
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} else {
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_p2 = unsafe.Pointer(&_zero)
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}
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r0, _, e1 := syscall.Syscall6(syscall.SYS_GETXATTR, uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(_p1)), uintptr(_p2), uintptr(len(dest)), 0, 0)
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sz = int(r0)
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if e1 != 0 {
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err = e1
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}
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return
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}
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func sysRemovexattr(path string, attr string) (err error) {
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var _p0 *byte
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_p0, err = syscall.BytePtrFromString(path)
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if err != nil {
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return
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}
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var _p1 *byte
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_p1, err = syscall.BytePtrFromString(attr)
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if err != nil {
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return
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}
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_, _, e1 := syscall.Syscall(syscall.SYS_REMOVEXATTR, uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(_p1)), 0)
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if e1 != 0 {
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err = e1
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}
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return
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}
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func sysListxattr(path string, dest []byte) (sz int, err error) {
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var _p0 *byte
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_p0, err = syscall.BytePtrFromString(path)
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if err != nil {
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return
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}
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var _p1 unsafe.Pointer
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if len(dest) > 0 {
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_p1 = unsafe.Pointer(&dest[0])
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} else {
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_p1 = unsafe.Pointer(&_zero)
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}
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r0, _, e1 := syscall.Syscall(syscall.SYS_LISTXATTR, uintptr(unsafe.Pointer(_p0)), uintptr(_p1), uintptr(len(dest)))
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sz = int(r0)
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if e1 != 0 {
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err = e1
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}
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return
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}
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func sysSetxattr(path string, attr string, val []byte, flag int) error {
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return syscall.Setxattr(path, attr, val, flag)
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}
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const _AT_SYMLINK_NOFOLLOW = 0x100
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// Linux kernel syscall utimensat(2)
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//
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// Needed to implement SetAttr on symlinks correctly as only utimensat provides
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// AT_SYMLINK_NOFOLLOW.
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func sysUtimensat(dirfd int, pathname string, times *[2]syscall.Timespec, flags int) (err error) {
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// Null-terminated version of pathname
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p0, err := syscall.BytePtrFromString(pathname)
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if err != nil {
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return err
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}
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_, _, e1 := syscall.Syscall6(syscall.SYS_UTIMENSAT,
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uintptr(dirfd), uintptr(unsafe.Pointer(p0)), uintptr(unsafe.Pointer(times)), uintptr(flags), 0, 0)
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if e1 != 0 {
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err = syscall.Errno(e1)
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}
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return
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}
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