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Commit 0b6bef99 authored by irfan sharif's avatar irfan sharif Committed by Tobias Klauser
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unix: add {get,set,remove,list}xattr on darwin 

It's only when dest is set to NULL that the OS X implementations of
getxattr() and listxattr() return the current sizes of the named
attributes. An empty byte array is not sufficient. To maintain the same
behaviour as the linux implementation, we wrap around the system calls
and pass in NULL when dest is empty.

The parameters for the OS X implementation of setxattr() vary slightly
compared to the linux system call, specifically the 'position'
parameter:

 linux:
     int setxattr(
         const char *path,
         const char *name,
         const void *value,
         size_t size,
         int flags
     );

 darwin:
     int setxattr(
         const char *path,
         const char *name,
         void *value,
         size_t size,
         u_int32_t position,
         int options
     );

'position' specifies the offset within the extended attribute. In the
current implementation, only the resource fork extended attribute makes
use of this argument. For all others, position is reserved.  We simply
default to setting it to zero.  If that's needed by the package user, a
function with a different name needs to be implemented instead.

Similarly for removexattr(), we wrap around and explicitly zero out the
options provided. We do so for interoperability with the linux variant.
If options are needed by the package user, a function with a different
name needs to be implemented instead.

Fixes golang/go#14456

Change-Id: I2581e1fa8dc9324bced7fda7f8ada10fe2ede3f5
Reviewed-on: https://go-review.googlesource.com/113995Reviewed-by: 's avatarTobias Klauser <tobias.klauser@gmail.com>
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
parent 7f59abf3
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Showing with 380 additions and 5 deletions
unix/syscall_darwin.go
View file @ 0b6bef99
......@@ -176,6 +176,77 @@ func Getfsstat(buf []Statfs_t, flags int) (n int, err error) {
return
}
//sys getxattr(path string, attr string, dest *byte, size int, position uint32, options int) (sz int, err error)
func Getxattr(path string, attr string, dest []byte) (sz int, err error) {
// It's only when dest is set to NULL that the OS X implementations of
// getxattr() and listxattr() return the current sizes of the named attributes.
// An empty byte array is not sufficient. To maintain the same behaviour as the
// linux implementation, we wrap around the system calls and pass in NULL when
// dest is empty.
var destp *byte
if len(dest) > 0 {
destp = &dest[0]
}
return getxattr(path, attr, destp, len(dest), 0, 0)
}
//sys setxattr(path string, attr string, data *byte, size int, position uint32, options int) (err error)
func Setxattr(path string, attr string, data []byte, flags int) (err error) {
// The parameters for the OS X implementation vary slightly compared to the
// linux system call, specifically the position parameter:
//
// linux:
// int setxattr(
// const char *path,
// const char *name,
// const void *value,
// size_t size,
// int flags
// );
//
// darwin:
// int setxattr(
// const char *path,
// const char *name,
// void *value,
// size_t size,
// u_int32_t position,
// int options
// );
//
// position specifies the offset within the extended attribute. In the
// current implementation, only the resource fork extended attribute makes
// use of this argument. For all others, position is reserved. We simply
// default to setting it to zero.
var datap *byte
if len(data) > 0 {
datap = &data[0]
}
return setxattr(path, attr, datap, len(data), 0, flags)
}
//sys removexattr(path string, attr string, options int) (err error)
func Removexattr(path string, attr string) (err error) {
// We wrap around and explicitly zero out the options provided to the OS X
// implementation of removexattr, we do so for interoperability with the
// linux variant.
return removexattr(path, attr, 0)
}
//sys listxattr(path string, dest *byte, size int, options int) (sz int, err error)
func Listxattr(path string, dest []byte) (sz int, err error) {
// See comment in Getxattr for as to why Listxattr is implemented as such.
var destp *byte
if len(dest) > 0 {
destp = &dest[0]
}
return listxattr(path, destp, len(dest), 0)
}
func setattrlistTimes(path string, times []Timespec, flags int) error {
_p0, err := BytePtrFromString(path)
if err != nil {
......@@ -447,13 +518,9 @@ func Uname(uname *Utsname) error {
// Watchevent
// Waitevent
// Modwatch
// Getxattr
// Fgetxattr
// Setxattr
// Fsetxattr
// Removexattr
// Fremovexattr
// Listxattr
// Flistxattr
// Fsctl
// Initgroups
......
unix/zsyscall_darwin_386.go
View file @ 0b6bef99
......@@ -399,6 +399,83 @@ func pipe() (r int, w int, err error) {
// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
func getxattr(path string, attr string, dest *byte, size int, position uint32, options int) (sz int, err error) {
var _p0 *byte
_p0, err = BytePtrFromString(path)
if err != nil {
return
}
var _p1 *byte
_p1, err = BytePtrFromString(attr)
if err != nil {
return
}
r0, _, e1 := Syscall6(SYS_GETXATTR, uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(_p1)), uintptr(unsafe.Pointer(dest)), uintptr(size), uintptr(position), uintptr(options))
sz = int(r0)
if e1 != 0 {
err = errnoErr(e1)
}
return
}
// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
func setxattr(path string, attr string, data *byte, size int, position uint32, options int) (err error) {
var _p0 *byte
_p0, err = BytePtrFromString(path)
if err != nil {
return
}
var _p1 *byte
_p1, err = BytePtrFromString(attr)
if err != nil {
return
}
_, _, e1 := Syscall6(SYS_SETXATTR, uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(_p1)), uintptr(unsafe.Pointer(data)), uintptr(size), uintptr(position), uintptr(options))
if e1 != 0 {
err = errnoErr(e1)
}
return
}
// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
func removexattr(path string, attr string, options int) (err error) {
var _p0 *byte
_p0, err = BytePtrFromString(path)
if err != nil {
return
}
var _p1 *byte
_p1, err = BytePtrFromString(attr)
if err != nil {
return
}
_, _, e1 := Syscall(SYS_REMOVEXATTR, uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(_p1)), uintptr(options))
if e1 != 0 {
err = errnoErr(e1)
}
return
}
// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
func listxattr(path string, dest *byte, size int, options int) (sz int, err error) {
var _p0 *byte
_p0, err = BytePtrFromString(path)
if err != nil {
return
}
r0, _, e1 := Syscall6(SYS_LISTXATTR, uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(dest)), uintptr(size), uintptr(options), 0, 0)
sz = int(r0)
if e1 != 0 {
err = errnoErr(e1)
}
return
}
// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
func kill(pid int, signum int, posix int) (err error) {
_, _, e1 := Syscall(SYS_KILL, uintptr(pid), uintptr(signum), uintptr(posix))
if e1 != 0 {
......
unix/zsyscall_darwin_amd64.go
View file @ 0b6bef99
......@@ -399,6 +399,83 @@ func pipe() (r int, w int, err error) {
// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
func getxattr(path string, attr string, dest *byte, size int, position uint32, options int) (sz int, err error) {
var _p0 *byte
_p0, err = BytePtrFromString(path)
if err != nil {
return
}
var _p1 *byte
_p1, err = BytePtrFromString(attr)
if err != nil {
return
}
r0, _, e1 := Syscall6(SYS_GETXATTR, uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(_p1)), uintptr(unsafe.Pointer(dest)), uintptr(size), uintptr(position), uintptr(options))
sz = int(r0)
if e1 != 0 {
err = errnoErr(e1)
}
return
}
// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
func setxattr(path string, attr string, data *byte, size int, position uint32, options int) (err error) {
var _p0 *byte
_p0, err = BytePtrFromString(path)
if err != nil {
return
}
var _p1 *byte
_p1, err = BytePtrFromString(attr)
if err != nil {
return
}
_, _, e1 := Syscall6(SYS_SETXATTR, uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(_p1)), uintptr(unsafe.Pointer(data)), uintptr(size), uintptr(position), uintptr(options))
if e1 != 0 {
err = errnoErr(e1)
}
return
}
// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
func removexattr(path string, attr string, options int) (err error) {
var _p0 *byte
_p0, err = BytePtrFromString(path)
if err != nil {
return
}
var _p1 *byte
_p1, err = BytePtrFromString(attr)
if err != nil {
return
}
_, _, e1 := Syscall(SYS_REMOVEXATTR, uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(_p1)), uintptr(options))
if e1 != 0 {
err = errnoErr(e1)
}
return
}
// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
func listxattr(path string, dest *byte, size int, options int) (sz int, err error) {
var _p0 *byte
_p0, err = BytePtrFromString(path)
if err != nil {
return
}
r0, _, e1 := Syscall6(SYS_LISTXATTR, uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(dest)), uintptr(size), uintptr(options), 0, 0)
sz = int(r0)
if e1 != 0 {
err = errnoErr(e1)
}
return
}
// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
func kill(pid int, signum int, posix int) (err error) {
_, _, e1 := Syscall(SYS_KILL, uintptr(pid), uintptr(signum), uintptr(posix))
if e1 != 0 {
......
unix/zsyscall_darwin_arm.go
View file @ 0b6bef99
// mksyscall.pl -tags darwin,arm syscall_bsd.go syscall_darwin.go syscall_darwin_arm.go
// mksyscall.pl -l32 -tags darwin,arm syscall_bsd.go syscall_darwin.go syscall_darwin_arm.go
// Code generated by the command above; see README.md. DO NOT EDIT.
// +build darwin,arm
......@@ -399,6 +399,83 @@ func pipe() (r int, w int, err error) {
// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
func getxattr(path string, attr string, dest *byte, size int, position uint32, options int) (sz int, err error) {
var _p0 *byte
_p0, err = BytePtrFromString(path)
if err != nil {
return
}
var _p1 *byte
_p1, err = BytePtrFromString(attr)
if err != nil {
return
}
r0, _, e1 := Syscall6(SYS_GETXATTR, uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(_p1)), uintptr(unsafe.Pointer(dest)), uintptr(size), uintptr(position), uintptr(options))
sz = int(r0)
if e1 != 0 {
err = errnoErr(e1)
}
return
}
// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
func setxattr(path string, attr string, data *byte, size int, position uint32, options int) (err error) {
var _p0 *byte
_p0, err = BytePtrFromString(path)
if err != nil {
return
}
var _p1 *byte
_p1, err = BytePtrFromString(attr)
if err != nil {
return
}
_, _, e1 := Syscall6(SYS_SETXATTR, uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(_p1)), uintptr(unsafe.Pointer(data)), uintptr(size), uintptr(position), uintptr(options))
if e1 != 0 {
err = errnoErr(e1)
}
return
}
// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
func removexattr(path string, attr string, options int) (err error) {
var _p0 *byte
_p0, err = BytePtrFromString(path)
if err != nil {
return
}
var _p1 *byte
_p1, err = BytePtrFromString(attr)
if err != nil {
return
}
_, _, e1 := Syscall(SYS_REMOVEXATTR, uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(_p1)), uintptr(options))
if e1 != 0 {
err = errnoErr(e1)
}
return
}
// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
func listxattr(path string, dest *byte, size int, options int) (sz int, err error) {
var _p0 *byte
_p0, err = BytePtrFromString(path)
if err != nil {
return
}
r0, _, e1 := Syscall6(SYS_LISTXATTR, uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(dest)), uintptr(size), uintptr(options), 0, 0)
sz = int(r0)
if e1 != 0 {
err = errnoErr(e1)
}
return
}
// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
func kill(pid int, signum int, posix int) (err error) {
_, _, e1 := Syscall(SYS_KILL, uintptr(pid), uintptr(signum), uintptr(posix))
if e1 != 0 {
......
unix/zsyscall_darwin_arm64.go
View file @ 0b6bef99
......@@ -399,6 +399,83 @@ func pipe() (r int, w int, err error) {
// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
func getxattr(path string, attr string, dest *byte, size int, position uint32, options int) (sz int, err error) {
var _p0 *byte
_p0, err = BytePtrFromString(path)
if err != nil {
return
}
var _p1 *byte
_p1, err = BytePtrFromString(attr)
if err != nil {
return
}
r0, _, e1 := Syscall6(SYS_GETXATTR, uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(_p1)), uintptr(unsafe.Pointer(dest)), uintptr(size), uintptr(position), uintptr(options))
sz = int(r0)
if e1 != 0 {
err = errnoErr(e1)
}
return
}
// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
func setxattr(path string, attr string, data *byte, size int, position uint32, options int) (err error) {
var _p0 *byte
_p0, err = BytePtrFromString(path)
if err != nil {
return
}
var _p1 *byte
_p1, err = BytePtrFromString(attr)
if err != nil {
return
}
_, _, e1 := Syscall6(SYS_SETXATTR, uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(_p1)), uintptr(unsafe.Pointer(data)), uintptr(size), uintptr(position), uintptr(options))
if e1 != 0 {
err = errnoErr(e1)
}
return
}
// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
func removexattr(path string, attr string, options int) (err error) {
var _p0 *byte
_p0, err = BytePtrFromString(path)
if err != nil {
return
}
var _p1 *byte
_p1, err = BytePtrFromString(attr)
if err != nil {
return
}
_, _, e1 := Syscall(SYS_REMOVEXATTR, uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(_p1)), uintptr(options))
if e1 != 0 {
err = errnoErr(e1)
}
return
}
// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
func listxattr(path string, dest *byte, size int, options int) (sz int, err error) {
var _p0 *byte
_p0, err = BytePtrFromString(path)
if err != nil {
return
}
r0, _, e1 := Syscall6(SYS_LISTXATTR, uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(dest)), uintptr(size), uintptr(options), 0, 0)
sz = int(r0)
if e1 != 0 {
err = errnoErr(e1)
}
return
}
// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
func kill(pid int, signum int, posix int) (err error) {
_, _, e1 := Syscall(SYS_KILL, uintptr(pid), uintptr(signum), uintptr(posix))
if e1 != 0 {
......
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