#include <sys/socket.h>
#include <netinet/in.h>
#include <stdint.h>
#include <unistd.h>
#include <stdio.h>
#include <errno.h>
#include "network.h"

int
net_listen4(uint32_t ip, uint16_t port, int backlog)
{
	struct sockaddr_in addr_in = { 0 };
	int sock = 0;
	int temp = 1;

	if (ip != 0) {
		return -ENOSYS;
	}

	if (port == 0) {
		return -EINVAL;
	}

	addr_in.sin_port = htons(port);
	sock = socket(AF_INET, SOCK_STREAM, 0);
	if (errno != 0) {
		perror("socket(3)");
		return -errno;
	}

	temp = 1;
	setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &temp, sizeof(temp));
	if (errno != 0) {
		perror("setsockopt(3)");
		close(sock);
		return -errno;
	}

	bind(sock, (struct sockaddr *)&addr_in, sizeof(addr_in));
	if (errno != 0) {
		perror("bind(3)");
		close(sock);
		return -errno;
	}

	listen(sock, backlog);
	if (errno != 0) {
		perror("listen(3)");
		close(sock);
		return -errno;
	}

	return sock;
}