这样将保护程序代码避免堆栈、缓冲区和函数指针溢出，而且全都不需重新编译。

This protects against stack, buffer, and function pointer overflows, all without recompilation.

youdao

数据在被最终传入到应用程序前，在磁盘、内核缓冲区和用户缓冲区中被拷贝了多次。

The data gets copied multiple times among the disk, kernel buffer, and user buffer before it is finally delivered to the application.

youdao

首先必须分配用户空间数据缓冲区和检测缓冲区，并将它们指向sg_io_hdr对象。

First the user space data buffer and sense buffer should be allocated and made to point to the sg_io_hdr object.

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