如题，在网上找到关于非标准波特率设置的方法，但是却报错误，特来请教，谢谢大家！！
程序如下：
//设置为特诉波特率，比如28800
int operateCardData::serial_set_speci_baud(struct serial_t *tty,int baud)
{
struct serial_struct ss,ss_set;
cfsetispeed(&tty->options,B38400);
cfsetospeed(&tty->options,B38400);
tcflush(tty->fd,TCIFLUSH);/*handle unrecevie char*/
tcsetattr(tty->fd,TCSANOW,&tty->options);
if((ioctl(tty->fd,TIOCGSERIAL,&ss)) <0){
printf("BAUD: error to get the serial_struct info:%s\n",strerror(errno));
return -1;
}
ss.flags = ASYNC_SPD_CUST;
ss.custom_divisor = ss.baud_base / baud;
if((ioctl(tty->fd,TIOCSSERIAL,&ss)) <0){
printf("BAUD: error to set serial_struct:%s\n",strerror(errno));//在这里出现的错误
return -2;
}
ioctl(tty->fd,TIOCGSERIAL,&ss_set);
printf("BAUD: success set baud to %d,custom_divisor=%d,baud_base=%d\n",
baud,ss_set.custom_divisor,ss_set.baud_base);
return 0;
}
