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unix: add symlink-safe *xattr functions on darwin

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Updates golang/go#14456

Change-Id: I04632ef1d302e938a2cc373eb90f600f01404380
Reviewed-on: https://go-review.googlesource.com/114198
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
This commit is contained in:
Tobias Klauser
2018-05-23 21:11:48 +00:00
committed by Tobias Klauser
parent f3b0f5faf5
commit 77b0e43150
7 changed files with 78 additions and 16 deletions
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unix/syscall_darwin.go
+26 -15
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@@ -176,9 +176,7 @@ 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) {
func xattrPointer(dest []byte) *byte {
// 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
@@ -188,7 +186,17 @@ func Getxattr(path string, attr string, dest []byte) (sz int, err error) {
if len(dest) > 0 {
destp = &dest[0]
}
return getxattr(path, attr, destp, len(dest), 0, 0)
return destp
}
//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) {
return getxattr(path, attr, xattrPointer(dest), len(dest), 0, 0)
}
func Lgetxattr(link string, attr string, dest []byte) (sz int, err error) {
return getxattr(link, attr, xattrPointer(dest), len(dest), 0, XATTR_NOFOLLOW)
}
//sys setxattr(path string, attr string, data *byte, size int, position uint32, options int) (err error)
@@ -220,11 +228,11 @@ func Setxattr(path string, attr string, data []byte, flags int) (err error) {
// 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)
return setxattr(path, attr, xattrPointer(data), len(data), 0, flags)
}
func Lsetxattr(link string, attr string, data []byte, flags int) (err error) {
return setxattr(link, attr, xattrPointer(data), len(data), 0, flags|XATTR_NOFOLLOW)
}
//sys removexattr(path string, attr string, options int) (err error)
@@ -236,15 +244,18 @@ func Removexattr(path string, attr string) (err error) {
return removexattr(path, attr, 0)
}
func Lremovexattr(link string, attr string) (err error) {
return removexattr(link, attr, XATTR_NOFOLLOW)
}
//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)
return listxattr(path, xattrPointer(dest), len(dest), 0)
}
func Llistxattr(link string, dest []byte) (sz int, err error) {
return listxattr(link, xattrPointer(dest), len(dest), XATTR_NOFOLLOW)
}
func setattrlistTimes(path string, times []Timespec, flags int) error {