Measure the test taker's understanding about some of the terms used in Linux framebuffer.

1. Why is the monitor not display?

Monitor means "Monitor", but display doesn't. It just means "display". The main meaning of using a monitor is to monitor the running and working status of a computer, therefore, use the word "Monitor.

2. What does the poll function mean?
Similar to select, poll is also used on a set of given file descriptors. When specifying these descriptors, you must use an array of struct, where each struct represents a file descriptor. Compared with select, poll has the advantage that you can judge some rare conditions, but select cannot. These conditions are pollerr, pollhup, and pollnval, which will be discussed later. Although there has been a lot of discussion about select or poll, it depends largely on your personal interests. See: http://www.chinaunix.net/jh/89/699989.html