在很多数据读取例程中,如果读到一个特别大的数,就会发生“溢出”而变成一个负数。
Many number-reading routines, if presented with an excessively large number, will "roll over" the value into a negative number.
信道数是等待被读取的数据量(对于读信道而言)或仍能被写入的数据量(对于写信道而言)。
The channel count is the amount of data waiting to be read (for read channels), or the amount of data which can still be written (for write channels).
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