Function usage

lib_acl_cpp/samples/aio/pkg_server/main.cpp:183–190

};

static void usage(const char* procname)
{
	printf("usage: %s -h[help]\r\n"
		"	-l ip:port[:1900]\r\n"
		"	-t timeout\r\n"
		"	-k[use kernel event: epoll/iocp/kqueue/devpool]\r\n",
		procname);
}

int main(int argc, char* argv[])
{