参数的性能不是数量(或一点点)而是发送的字节数。
The performance is not about number of parameters (or just a little) but about number of bytes send.
这些数据很可能是某个网络或计算机接收或发送的字节数。
The data will most likely be bytes transfered from and to a network or a computer.
该函数在成功时,返回 0,否则返回一个非零数,指出不能发送的字节数。
The function returns zero on success or non-zero to indicate the number of bytes that weren't transferred.
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