New submission from Benjamin Peterson <benja...@python.org>:

Recent versions of Linux has built out support for pidfd, a way to do process 
management with file descriptors. I wanted to try it out, so implemented a 
pidfd-based child watcher for asyncio.

My WIP progress patch is attached. It passes all asyncio tests.

----------
components: asyncio
files: 0001-asyncio-Add-a-pidfd-child-process-watcher.patch
keywords: patch
messages: 356001
nosy: asvetlov, benjamin.peterson, yselivanov
priority: normal
severity: normal
status: open
title: add a pidfd child process watcher
type: enhancement
versions: Python 3.9
Added file: 
https://bugs.python.org/file48695/0001-asyncio-Add-a-pidfd-child-process-watcher.patch

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