通常，业务管理应用程序很少描述它的导出文件。
The typical business-management application does a very poor job documenting its export files.
在处理多个文件描述符时，应用程序通常把每个文件描述符设置为非阻塞(见清单1)，每次对一个文件描述符执行read调用。
When dealing with multiple file descriptors, an application typically sets each file descriptor as non-blocking (as shown in Listing 1) and issues a read on one file descriptor at a time.
因为应用程序打开文件的描述符列表提供了大量关于这个应用程序本身的信息，所以能够查看这个列表将是很有帮助的。
Because the list of open file descriptors of an application give a great deal of information about the application itself, being able to peer into this list is helpful.
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