[C++] TCP socket_file descriptor, text file descriptor

 

   
#include <stdio.h>

#include <stdlib.h>

#include <winsock.h>

#include <time.h>

#include <fstream>

#include <iostream>

#include <fcntl.h>

#include <io.h>

#define MAXLINE 1000

#pragma warning(disable: 4996)

int main()

{

 // Initialize Winsock

 WSADATA wsaData;

 int iResult = WSAStartup(MAKEWORD(2, 2), &wsaData);

 if (iResult != NO_ERROR)

 printf("Server: Error at WSAStartup().\n");

 // Create a SOCKET for listening for incoming connection requests.

 SOCKET sockListen;

sockListen = socket(AF_INET, SOCK_STREAM, 0);

 if (sockListen == INVALID_SOCKET)

 {

 printf("Server: Error at socket(): %ld\n", WSAGetLastError());

 WSACleanup();

 return 0;

 }

 // The sockaddr_in structure specifies the address family,

 // IP address, and port for the socket that is being bound.

 struct sockaddr_in servAddr;

 memset(&servAddr, 0, sizeof(servAddr));

 servAddr.sin_family = AF_INET;

 servAddr.sin_addr.s_addr = htonl(INADDR_ANY);

 servAddr.sin_port = htons(13); /* daytime server */

 if (bind(sockListen, (SOCKADDR*)&servAddr, sizeof(servAddr)) == SOCKET_ERROR)

 {

 printf("Server: bind() failed.\n");

 closesocket(sockListen);

 return 0;

 }

 // Listen for incoming connection requests on the created socket

 if (listen(sockListen, 1) == SOCKET_ERROR)

 printf("Server: listen(): Error listening on socket.\n");

 printf("Server: I'm listening on socket, waiting for connection...\n");

 printf("socket file descriptor : %d\n", sockListen);

 int file = open("descriptor.txt", O_RDONLY);

 if (file == 0) {

 printf("파일을 찾을 수 없습니다\n");

 return 0;

 }

 else {

 printf("txt file descriptor : %d\n", file);

 close(file);

 }

 while (1)

 {

 char buff[MAXLINE];

 time_t ticks;

 // Accept connection

 SOCKET sockConn = accept(sockListen, NULL, NULL);

 // Get Time and send to Client

 ticks = time(NULL);

 sprintf(buff, "%.24s\r\n", ctime(&ticks));

 send(sockConn, buff, strlen(buff), 0);

 closesocket(sockConn);

 }

 WSACleanup();

 return 0;

}