PF_UNIX          1174 opal/mca/btl/usnic/btl_usnic_cagent.c     ipc_accept_fd = socket(PF_UNIX, SOCK_STREAM, 0);
PF_UNIX            59 opal/mca/btl/usnic/btl_usnic_cclient.c     agent_fd = socket(PF_UNIX, SOCK_STREAM, 0);
PF_UNIX           246 opal/mca/pmix/pmix4x/pmix/src/mca/ptl/usock/ptl_usock_component.c     lt->socket = socket(PF_UNIX, SOCK_STREAM, 0);
PF_UNIX           118 orte/util/listener.c     sd = socket(PF_UNIX, SOCK_STREAM, 0);