...集的数据直接传入循环缓存区(circular buffer),当循环缓存区全部填充了数据后,数据被复制到另外的一个用户缓存区(user buffer),同时清空循环缓存区,其运行过程如图4。
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random user buffer [计] 随机用户缓冲器
serial user buffer [计] 串行用户缓冲器
Use User Buffer 使用用户缓冲区
User Buffer Attributes 用户缓冲区属性
user service routine buffer area 用户服务例程缓冲区
buffer user 缓冲用户
The supplied user buffer is not valid for the requested operation.
提供给请求操作的用户缓冲区无效。
Step two: data is copied from the kernel buffer into the user buffer, and the read system call returns.
所需的数据被从读取缓冲区拷贝到用户缓冲区,read() 调用返回。
The strnlen_user function first checks to see that the user buffer is readable through a call to access_ok.
strnlen_user函数首先通过调用access_ok检查用户缓冲区是否可读。
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