It seems there\'s atleast 3 different local/unix socket types (AF_UNIX) , SOCK_STREAM, SOCK_DGRAM and SOCK_SEQPACKET.
AF_UNIX
SOCK_STREAM
SOCK_DGRAM
SOCK_SEQPACKET
Like TCP and UDP sockets, there are SCTP(stream control transmission protocol) sockets which has two forms, (one to one) and (one to many) between endpoints. One to one uses SOCK_STREAM and one to many uses SOCK_SEQPACKET