commit 0b6bef996066e7afc14080cbafc9719ca35f6204
author irfan sharif <irfanmahmoudsharif@gmail.com> Mon May 21 16:15:56 2018 -0400
committer Tobias Klauser <tobias.klauser@gmail.com> Tue May 22 21:16:09 2018 +0000
tree 63ef26f4e85fba22304b9fa54e6c5872edf0f9c9
parent 7f59abf37be6a6007f075af1bc7f16f137bc176b

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/113995
Reviewed-by: Tobias Klauser <tobias.klauser@gmail.com>
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>