taglinefilesource code
sun_family7include/linux/un.hunsigned short sun_family;  /* AF_UNIX */
sun_family224net/unix/sock.cupd->sockaddr_un.sun_family == sockun->sun_family &&
sun_family253net/unix/sock.cupd->sockaddr_un.sun_family = 0;
sun_family411net/unix/sock.cif (upd->sockaddr_un.sun_family != AF_UNIX) 
sun_family468net/unix/sock.cif (sockun.sun_family != AF_UNIX)