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Tracking Issue for tcp_deferaccept #119639
Description
Feature gate: #![feature(tcp_deferaccept)]
This is a tracking issue for the tcp_deferaccept feature.
It allows for the current socket to delay the acceptance of a connection until data is available to be read
Public API
It expands the existing Linux's TcpStreamExt trait with
pub trait TcpStreamExt: Sealed{
fn deferaccept(&self) -> io::Result<Duration>;
fn set_deferaccept(&self, accept: Duration) -> io::Result<()>;
}This feature directly translates to the underlying native Linux TCP_DEFER_ACCEPT tcp(7) option.
Activity
joshtriplett commentedon Apr 29, 2025
We talked about this in today's @rust-lang/libs-api meeting.
Several people felt like this should accept a
Durationinstead of au32number of seconds. That would allow for the future possibility of an interface that allows sub-second granularity, without having to add a new function.If we do that, then we should document that we round the
Durationdown to the nearest second.Rollup merge of rust-lang#140482 - devnexen:tcp_deferaccept_toduratio…
Rollup merge of rust-lang#140482 - devnexen:tcp_deferaccept_toduratio…
Rollup merge of rust-lang#140482 - devnexen:tcp_deferaccept_toduratio…
Unrolled build for #140482
Rollup merge of #140482 - devnexen:tcp_deferaccept_toduration, r=joboet
Rollup merge of rust-lang#140482 - devnexen:tcp_deferaccept_toduratio…
Rollup merge of #140482 - devnexen:tcp_deferaccept_toduration, r=joboet
JohnTitor commentedon Jan 28, 2026
The above comment is now resolved and I guess no blockers now? Could we start FCP to stabilize this? @rust-lang/libs-api
Amanieu commentedon Feb 14, 2026
@rfcbot merge libs-api
rust-rfcbot commentedon Feb 14, 2026
Team member @Amanieu has proposed to merge this. The next step is review by the rest of the tagged team members:
No concerns currently listed.
Once a majority of reviewers approve (and at most 2 approvals are outstanding), this will enter its final comment period. If you spot a major issue that hasn't been raised at any point in this process, please speak up!
See this document for info about what commands tagged team members can give me.
rust-rfcbot commentedon Mar 24, 2026
🔔 This is now entering its final comment period, as per the review above. 🔔
rust-rfcbot commentedon Apr 3, 2026
The final comment period, with a disposition to merge, as per the review above, is now complete.
As the automated representative of the governance process, I would like to thank the author for their work and everyone else who contributed.
JohnDowson commentedon Sep 17, 2026
I have got to ask. Why is it
deferacceptand notdefer_accept, when the underlying platform feature is speltTCP_DEFER_ACCEPTwith a word break?JohnTitor commentedon Sep 19, 2026
It has been discussed on #154834, and yeah we should rename it.
Maybe we should do re-FCP once everything has a consensus.