From: Eric Wong <normalperson@...>
Date: 2018-08-20T19:48:00+00:00
Subject: [ruby-core:88576] Re: [Ruby trunk Feature#15006] [PATCH] io.c: use copy_file_range with every types of files

jean.boussier@gmail.com wrote:
> However from my understanding, contrary to `sendfile` and
> `splice`, `copy_file_range` has no file type restriction, it
> should be able to copy from and to sockets and pipes just
> fine.

That is incorrect, copy_file_range requires both source and
destination as regular files:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/fs/read_write.c?h=v4.18#n1562

Did you try running "make test-all" with your patch?
It fails test/ruby/test_io.rb::test_copy_stream_megacontent_nonblock

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