fds, as with the poll system call, but portably.
(On systems that don't have poll, it is emulated using select.) This is used internally by MainContext, but it can be called directly if you need to block until a file descriptor is ready, but don't want to run the full main loop.
Each element of
fds is a PollFD describing a single file descriptor to
fd field indicates the file descriptor, and the
events field indicates the events to poll for. On return,
revents fields will be filled with the events that actually occurred.
On POSIX systems, the file descriptors in
fds can be any sort of file descriptor, but the situation is much more complicated on
Windows. If you need to use poll in code that has to run on Windows, the easiest solution is to construct all of
your PollFDs with
file descriptors to poll
amount of time to wait, in milliseconds, or -1 to wait forever
the number of file descriptors in
the number of entries in