该进程写入数据，一直到达缓冲区的末尾，然后将剩余的数据复制到缓冲区的开始位置，覆盖以前的日志条目。

The process writes whatever data it can until the end of the buffer, and the remaining data is copied to start overwriting the previous log entry.

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在写入了第一个日志条目(用蓝色表示)之后，当该进程尝试写入第二个条目(用红色表示)时，该缓冲区中已经没有足够的剩余空间。

After writing the first log entry, shown in blue, when the process tries to write the second one, shown in red, the buffer doesn't have enough space left.

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例如，安装了正确的Ant扩展任务后，可以触发ftp传输，可以写入日志文件或执行另一个操作系统进程。

For instance, with the right Ant extension tasks installed, an FTP transfer could be triggered, a log file could be written, or another operating system process could be executed.

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