1 #include 
     
       2 #include 
      
        3 #include 
       
         4 #include 
        
          5  6 #define BUF_SIZE 1024 7 void error_handling(char* message); 8  9 int main(int argc, char* argv[])10 {11     WSADATA wsadata;12     SOCKET hServSock, hClntSock;13     SOCKADDR_IN servAddr, clntAddr;14     TIMEVAL timeout;15     fd_set reads, cp_reads;16 17     int adr_sz;18     int str_len, i,fd_num;19     char buf[BUF_SIZE];20 21     if (argc != 2)22     {23         printf("usage:%s 
         
          \n",argv[0]);24         exit(1);25     }26     if (WSAStartup(MAKEWORD(2, 2), &wsadata) != 0)27         error_handling("WSAStartup error");28 29     hServSock = socket(PF_INET, SOCK_STREAM, 0);30     memset(&servAddr, 0, sizeof(servAddr));31     servAddr.sin_family = AF_INET;32     servAddr.sin_addr.S_un.S_addr = htonl(INADDR_ANY);33     servAddr.sin_port = htons(atoi(argv[1]));34 35     if (bind(hServSock, (SOCKADDR*)&servAddr, sizeof(servAddr)) == SOCKET_ERROR)36         error_handling("bind error");37     if (listen(hServSock, 5) == SOCKET_ERROR)38         error_handling("listen error");39 40     FD_ZERO(&reads);41     FD_SET(hServSock, &reads);42 43     while (1)44     {45         cp_reads = reads;46         timeout.tv_sec = 5;47 48         if ((fd_num = select(0, &cp_reads, 0, 0, &timeout)) == SOCKET_ERROR)49             break;50         if (fd_num == 0)51             continue;52 53         for (i = 0;i < reads.fd_count;i++)54         {55             if (FD_ISSET(reads.fd_array[i], &cp_reads))56             {57                 if (reads.fd_array[i] == hServSock)58                 {59                     adr_sz = sizeof(clntAddr);60                     hClntSock = accept(hServSock, (SOCKADDR*)&servAddr, &adr_sz);61                     FD_SET(hClntSock, &reads);62                     printf("connected client:%d\n", hClntSock);63                 }64                 else65                 {66                     str_len = recv(reads.fd_array[i], buf, BUF_SIZE - 1, 0);67                     if (str_len == 0)68                     {69                         FD_CLR(reads.fd_array[i], &reads);70                         closesocket(cp_reads.fd_array[i]);71                         printf("closed client:%d\n", cp_reads.fd_array[i]);72                     }73                     else74                         send(reads.fd_array[i], buf, str_len, 0);75                 }76             }77         }78     }79     closesocket(hServSock);80     WSACleanup();81     return 0;82 }83 84 void error_handling(char* message)85 {86     fputs(message, stderr);87     fputc('\n', stderr);88     exit(1);89 }