如果 NSInputStream 对象在读取时被阻塞并且 TCP 连接被关闭，将返回什么？
假设一个线程被阻塞在 TCP 连接的 NSInputStream 对象的 read 方法上，并且连接从另一端关闭。会发生什么？该方法会返回一个值吗？该值将为零或负数吗？
文档此处 是这样说的：
A positive number indicates the number of bytes read;
0 indicates that the end of the buffer was reached;
A negative number means that the operation failed
这是文档中值 0 的拼写错误吗？它应该是“0 表示已到达流末尾”吗？
Suppose a thread is blocked on the read method of the NSInputStream object of a TCP connection, and the connection is closed from the other side. What will happen ? Will the method return with a value ? Will the value be zero or negative ?
The doc here says this:
A positive number indicates the number of bytes read;
0 indicates that the end of the buffer was reached;
A negative number means that the operation failed
Is that a typo in the doc for value 0 ? Should it be "0 indicates end of stream was reached" ?
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