int main()

in bpf/ibumad_user.c [84:159]
64 lines of code
14 McCabe index (conditional complexity)

int main(int argc, char **argv)
{
	struct bpf_program *prog;
	unsigned long delay = 5;
	char filename[256];
	int longindex = 0;
	int opt, err = -1;

	while ((opt = getopt_long(argc, argv, "hd:rSw",
				  long_options, &longindex)) != -1) {
		switch (opt) {
		case 'd':
			delay = strtoul(optarg, NULL, 0);
			if (delay == ULONG_MAX || delay < 0 ||
			    delay > 1000000) {
				fprintf(stderr, "ERROR: invalid delay : %s\n",
					optarg);
				usage(argv[0]);
				return 1;
			}
			break;
		default:
		case 'h':
			usage(argv[0]);
			return 1;
		}
	}

	/* Do one final dump when exiting */
	signal(SIGINT, dump_exit);
	signal(SIGTERM, dump_exit);

	snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
	obj = bpf_object__open_file(filename, NULL);
	if (libbpf_get_error(obj)) {
		fprintf(stderr, "ERROR: opening BPF object file failed\n");
		return err;
	}

	/* load BPF program */
	if (bpf_object__load(obj)) {
		fprintf(stderr, "ERROR: loading BPF object file failed\n");
		goto cleanup;
	}

	map_fd[0] = bpf_object__find_map_fd_by_name(obj, "read_count");
	map_fd[1] = bpf_object__find_map_fd_by_name(obj, "write_count");
	if (map_fd[0] < 0 || map_fd[1] < 0) {
		fprintf(stderr, "ERROR: finding a map in obj file failed\n");
		goto cleanup;
	}

	bpf_object__for_each_program(prog, obj) {
		tp_links[tp_cnt] = bpf_program__attach(prog);
		if (libbpf_get_error(tp_links[tp_cnt])) {
			fprintf(stderr, "ERROR: bpf_program__attach failed\n");
			tp_links[tp_cnt] = NULL;
			goto cleanup;
		}
		tp_cnt++;
	}

	while (1) {
		sleep(delay);
		dump_all_counts();
	}
	err = 0;

cleanup:
	/* Detach tracepoints */
	while (tp_cnt)
		bpf_link__destroy(tp_links[--tp_cnt]);

	bpf_object__close(obj);
	return err;
}