recvfrom 0.0.0.0

sample.c

unsigned int get_next_pkt(int fd, struct lx_pkt *pkt, struct sockaddr_in *si)
{
	socklen_t size_si = sizeof(struct sockaddr);
	ssize_t bytes;
	bytes = recvfrom(fd, pkt, 1024, 0, (struct sockaddr *) si, &size_si);
	if (bytes < 1) {
		return 0;
	}
	return (unsigned int) bytes;
}

user.c

static void processor()
{
	struct sockaddr_in si = {.sin_port=56700}; /* Avoid improbable null */
	unsigned int bytes;

	pkt = malloc(1024); /* Enough for known packages */
	while ((bytes = get_next_pkt(lx_ctx->sock.fd, pkt, &si))) {
		fprintf(stderr, "Address %u\n", si.sin_addr
				.s_addr);
	}
	free(pkt);
}