fsocreate
error = fsocreate(SCARG(uap, domain), NULL, SCARG(uap, type),
error = fsocreate(AF_LOCAL, &rso, SOCK_STREAM|soflags, 0, &rfd, &rf,
error = fsocreate(AF_LOCAL, &wso, SOCK_STREAM|soflags, 0, &wfd, &wf,
error = fsocreate(domain, &so1, type|flags, proto, &fd, &fp1, NULL);
error = fsocreate(domain, &so2, type|flags, proto, &fd, &fp2, so1);
rc = fsocreate(af, &so, sp->sp_type, sp->sp_proto, &fd, &fp, NULL);
int fsocreate(int, struct socket **, int, int, int *, file_t **,