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Question about the poll method in the driver

Source: Internet
Author: User
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For more information about the poll method in the driver-Linux general technology-Linux programming and kernel, see the following. Recently I was reading a book on drivers, and it was a bit confusing when I saw the poll method. I understood it as a device query to determine whether it is readable or writable.
But I think most of the driver's poll functions call poll_wait and put the waiting queue in a structure called poll_table (whether it is correct or not ), then I am depressed. Why don't I find the device code in poll.
In addition, I feel that poll has something to do with read and write, and it is messy.
I don't know which expert can help me solve the problem and give some advice!

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