...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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...冲区(input ring buffer) 是否为空,如果不为空就把输入循环缓冲区(input ring buffer)内的数据拷贝到用户缓冲区(user buffer),完成接收。
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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
Buffer Capacity per User 户的数据缓冲区大小
user service routine buffer area 用户服务例程缓冲区
user virtual memory buffer address 用户虚拟记忆缓冲地址
buffer user 缓冲用户
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。
The requested amount of data is copied from the read buffer into the user buffer, and the read 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。
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