hook_establish
if ((kif->pfik_ah_cookie = hook_establish(ifp->if_addrhooks, 1,
return hook_establish(&shutdownhook_list, NULL, fn, arg);
return hook_establish(&mountroothook_list, NULL,
return hook_establish(&exechook_list, &exec_lock,
return hook_establish(&exithook_list, &exithook_lock,
return hook_establish(&forkhook_list, &forkhook_lock,
return hook_establish(&critpollhook_list, NULL, fn, arg);