With my golang net/http server, I occasionally get errors like
2017/08/04 15:06:25 http: Accept error: accept tcp 127.0.0.1:80: accept4: too many open files; retrying in 1s
on stderr. There might be a bug with a missing Close() somewhere, but this is not what my question is about.
What I would like to know is whether there is an easy way to catch these or similar errors programmatically in go? I only know about this error because it's logged. Specifically: how do I access the errors of the underlying listener? ListenAndServe() does not return an error. Is there some other way to get notified of errors like these?ListenAndServe() does not return errors from the underlying listener (at least not all of them).
(edited)
If you look at how (*http.Server).Serve() is implemented here, it is clear that you can just define your own class that implements net.Listener and give it to the Serve() function, instead of using ListenAndServe(), which puts a default listener there. Make it panic on error and later recover from that panic in your code, or implement any other error handling logic.