本文介绍了tcflush函数的使用方法及参数含义。tcflush函数能够清除由fd指定的对象中已写入但未传输的数据，或是已接收但未读取的数据。通过设置queue_selector参数可以选择清除输入缓冲区(TCIFLUSH)、输出缓冲区(TCOFLUSH)或同时清除两者(TCIOFLUSH)。
tcflush
int tcflush(int fd, int queue_selector);
tcflush() discards data written to the object referred to by fd but not transmitted, or data received but not read, depending on the value of queue_selector.
TCIFLUSH
flushes data received but nor read.
TCOFLUSH
flushes data written but not transmitted.
TCIOFLUSH
flushes both data received but not read, and data written but not transmitted.
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