A mechanism to multiplex input/output over a set of file handles(file descriptors).
For every file handle provided, poll() examines it for any events registered for that particular file handle.
an array of PollFh struct carrying a FileHandle and bitmasks of events
number of file handles
timer value to timeout or -1 for loop forever
number of file handles selected (for which revents is non-zero). 0 if timed out with nothing selected. -1 for error.
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