Given this list of things I am interested in, return me
an array of objects for each of the things that is ready for me.
The object containing the relevant thing from the interested thing in
question.
So: I would pass in a list of fd's or fd's & a block of data (for writes)
Some listening sockets, some actual sockets
I would get back an array of structures
the leader would be
the fd that the data is for
In the listening case the next data would be an FD optionally with
remote info
In the read case I would get back
a block of data and a length and a 'more ready now' flag
In the write case I would get back
status and available buffer space.
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