Function usage

lib_acl_cpp/samples/aio/aio_client/main.cpp:235–240

}

static void usage(const char* procname)
{
	printf("usage: %s -h[help] -l server_addr -c nconnect"
		" -n io_max -k[use kernel event: epoll/kqueue/devpoll"
		" -t connect_timeout -d[debug]\n", procname);
}

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