从2004年开始，用户应该开始避免使用这样的操作系统，即它们至少没有对缓冲区溢出提供某种自动保护机制。
Beginning in 2004, users should start avoiding any operating system that fails to provide at least some automatic protection against buffer overflows.
Sendfile(2)是一种避免缓冲区复制开销的技术，并且它直接将数据位从文件系统转移到网络。
Sendfile (2) is a technique that avoids buffer copy overhead, and it directly pushes bits from the file system onto the network.
步骤二：write系统调用导致内核将数据从内核缓冲区复制到与socket相关联的内核缓冲区中。
Step two: the write system call causes the kernel to copy the data from the original kernel buffers into the kernel buffers associated with sockets.
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