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From: Lisanna Dettwyler <lisanna.dettwyler@gmail.com>
To: passt-dev@passt.top
Subject: Startup fd to avoid busywaits
Date: Wed, 27 May 2026 13:08:01 -0400	[thread overview]
Message-ID: <CAC-VXLYqvXu+yHsM=DUt-7MSGp_+o8Wt5zgGYzi1gdNvtoRK-A@mail.gmail.com> (raw)

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Hello! I would like to propose a patch that allows the invoker to pass a
"ready fd" on startup that gets written to once the setup has been
completed, similar to slirp4netns's `--ready-fd` flag. Currently we have to
poll the interface in a loop to wait for setup to be completed, and it
would be much better if we could instead block on fd activity.

Just wanted to check if such a contribution would be welcome before putting
in the work of authoring it, or if there's already a better way to wait for
the interface to come up. This is our current implementation:
https://github.com/NixOS/nix/pull/15919/changes#diff-2a9176262efad1ef345d882b0779646e7a5aaf9ca8db33e9da7fc408594b5377R94-R125

Thanks,
Lisanna

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             reply	other threads:[~2026-05-27 17:08 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-05-27 17:08 Lisanna Dettwyler [this message]
2026-05-27 19:39 ` Paul Holzinger
2026-05-27 19:39 ` Stefano Brivio

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