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.
这个请求会要求将sizeof(data)字节的数据从 argp所指向的主存地址处拷贝到 data对象中。
This request asks for sizeof(data) bytes of data copied from the address in main memory denoted by argp to be copied into the object data.
这个请求会要求将sizeof(data)字节的数据从 argp所指向的主存地址处拷贝到 data对象中。
This request asks for sizeof(data) bytes of data copied from the address in main memory denoted by argp to be copied into the object data.
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