On Sat, 2021-03-06 at 01:36 +0100, mwilck@suse.com wrote:

From: Martin Wilck <redacted>

For the nvme monitor functionality, an event handling mechanism
will be necessary which deals with event timeouts. While there are
standard
solutions for this (e.g. libevent), these add unnecessary complexity
and dependencies to nvme-cli.

Add a small, straighforward event and timeout handling code based
on epoll and timerfd.

This code is identical to what I've pushed recently to
https://github.com/mwilck/minivent, where I added a couple of unit
tests to make sure the code is as robust as it needs to be.

FTR, I found a use-after-free condition in this code. It's will be
fixed in the next iteration of this patch set.

Martin



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