winsock 连接超时时间设置

#include "winsock2.h"
#pragma comment(lib,"WS2_32.lib")
 
#include "stdio.h"
 
int main(int argc, char* argv[])
{
    WSADATA wsaData;
    WORD sockVersion = MAKEWORD(2,0);
    WSAStartup(sockVersion, &wsaData);
 
    SOCKET s = socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);
    if(s == INVALID_SOCKET)
    {
        return -1;
    }
 
    //设置非阻塞方式连接
    unsigned long ul = 1;
    int ret = ioctlsocket(s, FIONBIO, (unsigned long*)&ul);
    if(ret == SOCKET_ERROR) return -1;
 
    sockaddr_in servAddr;
    servAddr.sin_family = AF_INET;
    servAddr.sin_port = htons(81);  
    servAddr.sin_addr.S_un.S_addr = inet_addr("172.172.173.209");
 
    connect(s,(sockaddr*)&servAddr,sizeof(servAddr));
 
    //select 模型，即设置超时
    fd_set r;
    FD_ZERO(&r);
    FD_SET(s, &r);
 
    struct timeval timeout ;
    timeout.tv_sec = 3; //连接超时3秒
    timeout.tv_usec =0;
    ret = select(0, 0, &r, 0, &timeout);
    if(ret <= 0)
    {
        closesocket(s);
        return -1;
    }
 
    //设回阻塞模式
    ret = ioctlsocket(s, FIONBIO, (unsigned long*)&ul);
    if(ret == SOCKET_ERROR){
        closesocket(s);
        return -1;
    }
 
    //设置发送超时6秒
    int TimeOut = 6000;
    if(setsockopt(s,SOL_SOCKET,SO_SNDTIMEO,(char *)&TimeOut,sizeof(TimeOut)) == SOCKET_ERROR){
        return 0;
    }
 
    //设置接收超时6秒
    TimeOut = 6000;
    if(setsockopt(s,SOL_SOCKET,SO_RCVTIMEO,(char *)&TimeOut,sizeof(TimeOut)) == SOCKET_ERROR){
        return 0;
    }
 
    WSACleanup();
    return 0;
}