定位Linux下写句柄错误问题

编写代码时发现对于以下can 写资源句柄时出现的错误不是很能分析，但是如果将错误码打印出来后，清晰了很多，并且还可以查看。

int Can::Write(const struct can_frame *send_frame)
{ int result;std::cout << "before write s_ :" << s_  << std::endl;// writetry{result = write(s_, send_frame, sizeof(*send_frame));if (result < 0){std::cerr <<"Error writing to CAN socket: " << strerror(errno) << std::endl;std::cout << "Data size: " << sizeof(*send_frame) << std::endl;std::cout << "Socket descriptor: " << s_ << std::endl;std::cout << "write result: " << result << std::endl;// 错误类型: ENETDOWN// 说明: can 接口已关闭// 复现方法: 直接手动关闭can, command: sudo ip link set can0 down// 目前这种错误不能恢复// 错误类型: Bad file descriptor// 说明: 无效的文件描述符// 复现方法：程序中close socket canif (errno == EBADF) {// CAN 接口已关闭cout << "can socket closed" << endl;if(reconnectionsTimes <= Setting::MaxCanReconnections){if(!ReinitializeCanBus()){++reconnectionsTimes;std::cerr << "Failed to reinitialize CAN bus, reconnectionsTimes: " << reconnectionsTimes << std::endl;return result;}else{cout << "reinitialize CAN bus success! " << endl;reconnectionsTimes = 0;}}}}}catch(std::exception& e){std::cout << "Can write error: " << e.what() << std::endl;}return result;
}