Function usage

lib_acl_cpp/samples/benchmark/server2/main.cpp:61–67

}

static void usage(const char* procname)
{
	printf("usage: %s -h [help]\r\n"
		"\t-s server_addr[127.0.0.1:8888]\r\n"
		"\t-l read_length[1024]\r\n"
		"\t-k step[2]\r\n", procname);
}

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