linux - Default protocol for AF_UNIX sockets -


i'm curious default protocol af_unix sock_stream socket. i'm trying track down packet overhead should be, can't figure out protocol used default. suspect it's not ipproto_tcp because this:

socketpair(af_unix, sock_stream, 0, sfd)

works while, this:

socketpair(af_unix, sock_stream, ipproto_tcp, sfd)

gives "protocol not supported error".

since af_unix unix socket local thing, there's no such thing added protocol overhead in case. can use in sock_stream or sock_dgram mode make connection-oriented or connectionless, respectively, that's all: no protocol headers added , traverses none of network or transport protocol implementations in network stack.


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