sock_init
if (socket->type && socket->type->sock_init)
socket->type->sock_init(socket);
.sock_init = ti_init,
.sock_init = ti_init,
.sock_init = ti_init,
.sock_init = ti_init,
.sock_init = ti_init,
int (*sock_init)(struct yenta_socket *);
core_initcall(sock_init); /* early initcall */