The addrlen parameter should be the actual length of socket's name for abstract sockets. Otherwise socket gets padded with NULLs.

cat /proc/net/unix | grep lxc
[...]
0000000000000000: 00000003 00000000 00000000 0001 03 226548 @lxc/ad055575fe28ddd5//var/lib/lxc^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@
[...]

with this patch;

cat /proc/net/unix | grep lxc
[...]
0000000000000000: 00000002 00000000 00010000 0001 01 109563 @lxc/ad055575fe28ddd5//var/lib/lxc
[...]

Changes since v1:
    * check the length of passed-in string
Changes since v2:
    * remove non-abstract socket code path to simplify functions
    * rename lxc_af_unix_* family to lxc_abstract_unix_*
Signed-off-by: S.Çağlar Onur <caglar@10ur.org>
Signed-off-by: Serge Hallyn <serge.hallyn@ubuntu.com>