attach 4009命令启动对当前正在运行的nweb服务器的调试工作，并且gdb调试工具通过读取有关该进程的所有的符号信息来做出同样方式的响应。
The attach 4009 command starts debugging the currently running nweb server, and the GDB Debugger responds in kind by reading all the symbolic information about the process it can.
GDB 调试工具本身也可以附加于一个正在运行的进程，并帮助您进行更深入的研究。
The GDB Debugger can also attach itself to a currently running process and help you to dig even deeper.
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