a simple tcp server

server.cpp

#include <winsock2.h>
#include <stdio.h>
#include <windows.h>
#pragma comment(lib, "ws2_32.lib")

int main(int argc, char* argv[]) {
	if (argc != 2) {
		fprintf(stderr, "Usage: %s port\n", argv[0]);
		return -1;
	}
	short port = atoi(argv[1]);
	if (!port) {
		fprintf(stderr, "port num error: %s\n", argv[1]);
		return -1;
	}
	WSADATA wsa;
	if (WSAStartup(MAKEWORD(2, 2), &wsa)) {
		fprintf(stderr, "init socket failed\n");
		return -1;
	}

	SOCKET serverSocket;
	if ((serverSocket = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP)) ==
				INVLIAD_SOCKET) {
			fprintf(stderr, "create socket failed\n");
			return -1;
	}
	struct sockaddr_in serverAddress;
	memset(&serverAddress, 0, sizeof(struct sockaddr_in));
	serverAddress.sin_family = PF_INET;
	serverAddress.sin_addr.S_un.S_addr = htonl(INADDR_ANY);
	serverAddress.sin_port = htons(port);

	if (bind(serverSocket, (sockaddr*)&serverAddress, sizeof(serverAddress))
			== SOCKET_ERROR) {
		fprintf(stderr, "bind to %d failed\n", port);
		return -1;
	}
	if (listen(serverSocket, SOMAXCONN) == SOCKET_ERROR) {
		fprintf(stderr, "listen failed\n");
		return -1;
	}
	SOCKET clientSocket;
	struct sockaddr_in clientAddress;
	memset(&clientAddress, 0, sizeof(clientAddresss));
	int addrlen = sizeof(clientAddress);
	if ((clientSocket = accept(serverSocket, (sockaddr*)&clientAddress,
					&addrlen)) == INVLIAD_SOCKET) {
		fprintf(stderr, "accept failed\n");
		return -1;
	}
	char buf[4096];
	while (1) {
		int bytes = recv(clientSocket, buf, sizeof(buf), 0);
		if (bytes == SOCKET_ERROR) {
			fprintf(stderr, "recv failed\n");
			return -1;
		}
		buf[bytes] = '\0';
		if (send(clientSocket, buf, bytes, 0) == SOCKET_ERROR) {
			fprintf(stderr, "send failed\n");
			return -1;
		}
	}
	WSACleanup();
	return 0;
}