第一个值是为socket的发送缓冲区分配的最少字节数。
The first value is the minimum number of bytes allocated for the socket's send buffer.
第三个值是发送缓冲区空间的最大字节数(该值会被 wmem_max 覆盖)。
The third value is the maximum send buffer space (overridden by wmem_max).
下一步是把要发送的文件转换成字节数组。
The next step is to convert the file that I want to send into a byte array.
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