从此开始，根据构架，为执行从用户缓冲区到内核缓冲区的零拷贝(不可用字节)而进行一个调用。
From here, depending on architecture, a call is made to copy from the user buffer to a kernel buffer with zeroing (of unavailable bytes).
将这个整数造型为一个单字节时，只有最低有效位字节（ 0x00 到 0x7f）会作为十六进制值拷贝到单字节数组。
When you cast the integer into a single byte, only the least significant byte (0x00 to 0x7f) will be copied as a hex value to the single-byte array.
思科技术公司估算到2015年，每月将有6.3艾字节的移动数据流动，相当于《经济学人》杂志的630亿份拷贝量的总和。
Cisco, a technology company, reckons that by 2015 some 6.3 exabytes of mobile data will be flowing each month, or the equivalent of 63 billion copies of the Economist.
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