Remove pollfd workaround #12688
Description
Describe the bug
#12687 works-around an issue where we ended up with a non-blocking file descriptor in looping functions on file descriptors. The deeper problem is this is a sign we're getting some file descriptors mixed up. Once we sort that ought, we should be able to revert the pollfd workaround.
Steps To Reproduce
Expected behavior
Metadata
Additional context
Checklist
- checked latest Nix manual (source)
- checked open bug issues and pull requests for possible duplicates
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