linux connect超时方法

来源：互联网发布：订单管理数据流程图编辑：程序博客网时间：2024/05/17 05:14

1. 用信号超时，代码量小，更精巧

void u_alarm_handler()
{
}

sigset(SIGALRM, u_alarm_handler);
alarm(2);
code = connect(socket_fd,(struct sockaddr*)&socket_st, sizeof(struct sockaddr_in));
alarm(0);
sigrelse(SIGALRM);

2. 使用非阻塞
int error =-1,len;
timeval tm;
fd_set set;
unsigned long ul = 1;
ioctl(sock,FIONBIO,&ul);
bool ret;
if (::connect (sock, (struct sockaddr *) &destSin, sizeof (destSin)) < 0)
{
    tm.tv_sec = 2;
    tm.tv_usec = 0;
    FD_ZERO(&set);
    FD_SET(sock,&set);
    if(select(sock+1,NULL,&set,NULL,&tm)>0 && FD_ISSET(sock,&set)!=0)
    {
        getsockopt(sock,SOL_SOCKET,SO_ERROR,&error,(socklen_t*)&len);
        if(error ==0)
        {
            ret = true;
        }else{
            ret = false;
        }
    }else{
        ret = false;
    }
    if(!ret)
    {
        if(sock != -1)
            ::close(sock);
        sock = -1;
        return TVS_CONN_FAIL;
    }

}
//设置为非阻塞模式
ul = 0;
ioctl(GPro->iAnalyseSock,FIONBIO,&ul);

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