如果这个COMM_ _REQ由于某种原因失败，没有数据被送回到输入数据区。从内部输入缓冲器读出的数据保留，可以被后面的读请求检索到。这个功能使字符从指定端口被读，直到指定的结東字符被接收。把从内部输入缓冲器读到字符放入指定输入数据区域。该功能送回检索到的字符数和输入缓冲器中仍未处理的字符数。如果请求输入字符数为0，那么只有输入缓冲器中未经处理的字符数被送回。
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