不能打开临时文件。
如果您指定任意命令行参数,跟踪将打开,跟踪消息将被写入当前目录中的一个临时文件。
If you specify any command line parameters, tracing will be turned on and trace messages will be written to a temporary file in the current directory.
此代码小心地断开与临时文件的链接(让它仍是打开的,但已经被删除)来进行自动清空。
This code carefully unlinks the temporary file, leaving it open but already removed, to clean up automatically.
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