unix: add missing xattr symlink syscall functions on Linux
Add support for the lgetxattr, llistxattr, lremovexattr and lsetxattr on Linux, akin to the already existing getxattr, listxattr, removexattr and setxattr syscalls. These variants are identical to the already existing variants. except in the case of a symbolic link where the extended attribute operation is applied to the link itself rather than to the file that it refers to. See: http://man7.org/linux/man-pages/man2/getxattr.2.html http://man7.org/linux/man-pages/man2/listxattr.2.html http://man7.org/linux/man-pages/man2/removexattr.2.html http://man7.org/linux/man-pages/man2/setxattr.2.html Fixes golang/go#14116 Change-Id: I786953db8bf862566f54bdd745cc1feca5031be7 Reviewed-on: https://go-review.googlesource.com/44374Reviewed-by: Ian Lance Taylor <iant@golang.org> Run-TryBot: Ian Lance Taylor <iant@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org>
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