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标题: 请教select的使用问题 [打印本页]

作者: 龚申行 时间: 2007-09-20 18:19
标题: 请教select的使用问题
我在我socket的程序里使用select作为定时器，部分代码如下：
if(connect(m_fd_sock,
      reinterpret_cast<struct sockaddr *>(&server_addr_in),
            sizeof(sockaddr)) == -1)
{
   if(errno == EINPROGRESS)
   {
   fd_set t_fdset;
   FD_ZERO(&t_fdset);
   FD_SET(m_fd_sock,&t_fdset);
   int nfds=m_fd_sock+1;
   struct timeval timeout=SOCK_TIMEOUT;
   int ret = select(nfds,NULL,(&t_fdset),NULL,&timeout);
   if(ret == 1)
   {
   if(!FD_ISSET(m_fd_sock,&t_fdset))
   {
      m_errstr = "ERROR(Connect): error happened when connect to server. ";
      m_errstr += "socket server ip is ";
      m_errstr += m_ipaddr;
      close(m_fd_sock);
      m_fd_sock = -1;
      return false;
   }
   int error=0, len=sizeof(int);
   getsockopt(m_fd_sock, SOL_SOCKET, SO_ERROR, &error, (socklen_t *)&len);
   if(error != 0)
   {
      m_errstr = "ERROR(Connect): Exception happened when connect to server. ";
      m_errstr += "socket server ip is ";
      m_errstr += m_ipaddr;
      close(m_fd_sock);
      m_fd_sock = -1;
      return false;
   }
   return true;
   }
   else if(ret == 0)
   {
   m_errstr = "ERROR(Connect): Timeout when connect to server. ";
   m_errstr += "socket server ip is ";
   m_errstr += m_ipaddr;
   close(m_fd_sock);
   m_fd_sock = -1;
   return false;
   }
   else
   {
   m_errstr = "ERROR(Connect): Error happened when called select(). ";
   m_errstr += "socket server ip is ";
   m_errstr += m_ipaddr;
   close(m_fd_sock);
   m_fd_sock = -1;
   return false;
   }

   }
   else
   {
   close(m_fd_sock);
   m_fd_sock = -1;
   m_errstr = "ERROR(Connect): Failure when connect to server ";
   m_errstr += m_ipaddr;
   m_errstr += ", ";
   m_errstr += strerror(errno);
   return false;
   }
}
发现不停的有返回ERROR(Connect): Error happened when called select(). 的记录，甚至于程序coredump，想请教各位是我的程序写得有问题还是系统对select调用有限制啊？

作者: zxlzys 时间: 2007-09-20 19:07
errno 是多少？

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