sockaddr_nl for netlink sockets

src/unix/notbsd/linux/mod.rs

@@ -118,6 +118,13 @@ s! {
         pub f_namemax: ::c_ulong,
         __f_spare: [::c_int; 6],
     }
+
+    pub struct sockaddr_nl {
+        pub nl_family: ::sa_family_t,
+        nl_pad: ::c_ushort,
+        pub nl_pid: u32,
+        pub nl_groups: u32
+    }
 }
 
 pub const FILENAME_MAX: ::c_uint = 4096;