139 lines
3.2 KiB
Go
139 lines
3.2 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 fuse
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import (
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"bytes"
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"os"
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"syscall"
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"unsafe"
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)
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// TODO - move these into Go's syscall package.
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func sys_writev(fd int, iovecs *syscall.Iovec, cnt int) (n int, err error) {
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n1, _, e1 := syscall.Syscall(
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syscall.SYS_WRITEV,
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uintptr(fd), uintptr(unsafe.Pointer(iovecs)), uintptr(cnt))
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n = int(n1)
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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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func writev(fd int, packet [][]byte) (n int, err error) {
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iovecs := make([]syscall.Iovec, 0, len(packet))
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for _, v := range packet {
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if len(v) == 0 {
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continue
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}
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vec := syscall.Iovec{
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Base: &v[0],
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}
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vec.SetLen(len(v))
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iovecs = append(iovecs, vec)
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}
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sysErr := handleEINTR(func() error {
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var err error
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n, err = sys_writev(fd, &iovecs[0], len(iovecs))
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return err
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})
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if sysErr != nil {
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err = os.NewSyscallError("writev", sysErr)
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}
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return n, err
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}
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func getxattr(path string, attr string, dest []byte) (sz int, errno int) {
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pathBs := syscall.StringBytePtr(path)
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attrBs := syscall.StringBytePtr(attr)
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size, _, errNo := syscall.Syscall6(
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syscall.SYS_GETXATTR,
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uintptr(unsafe.Pointer(pathBs)),
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uintptr(unsafe.Pointer(attrBs)),
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uintptr(unsafe.Pointer(&dest[0])),
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uintptr(len(dest)),
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0, 0)
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return int(size), int(errNo)
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}
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func GetXAttr(path string, attr string, dest []byte) (value []byte, errno int) {
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sz, errno := getxattr(path, attr, dest)
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for sz > cap(dest) && errno == 0 {
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dest = make([]byte, sz)
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sz, errno = getxattr(path, attr, dest)
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}
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if errno != 0 {
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return nil, errno
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}
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return dest[:sz], errno
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}
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func listxattr(path string, dest []byte) (sz int, errno int) {
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pathbs := syscall.StringBytePtr(path)
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var destPointer unsafe.Pointer
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if len(dest) > 0 {
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destPointer = unsafe.Pointer(&dest[0])
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}
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size, _, errNo := syscall.Syscall(
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syscall.SYS_LISTXATTR,
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uintptr(unsafe.Pointer(pathbs)),
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uintptr(destPointer),
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uintptr(len(dest)))
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return int(size), int(errNo)
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}
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func ListXAttr(path string) (attributes []string, errno int) {
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dest := make([]byte, 0)
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sz, errno := listxattr(path, dest)
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if errno != 0 {
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return nil, errno
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}
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for sz > cap(dest) && errno == 0 {
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dest = make([]byte, sz)
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sz, errno = listxattr(path, dest)
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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, errno
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}
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func Setxattr(path string, attr string, data []byte, flags int) (errno int) {
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pathbs := syscall.StringBytePtr(path)
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attrbs := syscall.StringBytePtr(attr)
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_, _, errNo := syscall.Syscall6(
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syscall.SYS_SETXATTR,
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uintptr(unsafe.Pointer(pathbs)),
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uintptr(unsafe.Pointer(attrbs)),
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uintptr(unsafe.Pointer(&data[0])),
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uintptr(len(data)),
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uintptr(flags), 0)
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return int(errNo)
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}
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func Removexattr(path string, attr string) (errno int) {
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pathbs := syscall.StringBytePtr(path)
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attrbs := syscall.StringBytePtr(attr)
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_, _, errNo := syscall.Syscall(
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syscall.SYS_REMOVEXATTR,
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uintptr(unsafe.Pointer(pathbs)),
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uintptr(unsafe.Pointer(attrbs)), 0)
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return int(errNo)
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}
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