Źródło.cpp

#ifndef WIN32_LEAN_AND_MEAN
#define WIN32_LEAN_AND_MEAN
#endif
#define _WINSOCK_DEPRECATED_NO_WARNINGS

#include <stdio.h>
#include <windows.h>
#include <winsock2.h>
#include <ws2tcpip.h>

#define PORT    "32001" /* Port to listen on */
#define BACKLOG 10      /* Passed to listen() */

void handle(SOCKET newsock)
{
	/* send(), recv(), closesocket() */
}

int main(void)
{
	WORD wVersion = MAKEWORD(2, 2);
	WSADATA wsaData;
	int iResult;
	SOCKET sock;
	struct addrinfo hints, * res;
	int reuseaddr = 1; /* True */

	/* Initialise Winsock */
	if ((iResult = WSAStartup(wVersion, &wsaData)) != 0) {
		printf("WSAStartup failed: %d\n", iResult);
		return 1;
	}

	/* Get the address info */
	ZeroMemory(&hints, sizeof hints);
	hints.ai_family = AF_INET;
	hints.ai_socktype = SOCK_STREAM;
	if (getaddrinfo(NULL, PORT, &hints, &res) != 0) {
		perror("getaddrinfo");
		return 1;
	}

	/* Create the socket */
	sock = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
	if (sock == INVALID_SOCKET) {
		perror("socket");
		WSACleanup();
		return 1;
	}

	/* Enable the socket to reuse the address */
	if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (const char*)&reuseaddr, sizeof(int)) == SOCKET_ERROR) {
		perror("setsockopt");
		WSACleanup();
		return 1;
	}

	/* Bind to the address */
	if (bind(sock, res->ai_addr, res->ai_addrlen) == SOCKET_ERROR) {
		perror("bind");
		WSACleanup();
		return 1;
	}

	/* Listen */
	if (listen(sock, BACKLOG) == SOCKET_ERROR) {
		perror("listen");
		WSACleanup();
		return 1;
	}

	freeaddrinfo(res);

	/* Main loop */
	while (1) {
		int size = sizeof(struct sockaddr);
		struct sockaddr_in their_addr;
		SOCKET newsock;

		ZeroMemory(&their_addr, sizeof(struct sockaddr));
		newsock = accept(sock, (struct sockaddr*)&their_addr, &size);
		if (newsock == INVALID_SOCKET) {
			perror("accept\n");
		}
		else {
			printf("Got a connection from %s on port %d\n",
				inet_ntoa(their_addr.sin_addr), ntohs(their_addr.sin_port));

			handle(newsock);
		}
	}

	/* Clean up */
	closesocket(sock);
	WSACleanup();

	return 0;
}