dotnet/runtime

Support Socket.DuplicateAndClose through pidfd_getfd on Linux

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#113,701 opened on Mar 19, 2025

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 (9 comments) (0 reactions) (0 assignees)C# (5,445 forks)batch import
area-System.Net.Socketshelp wanted

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Description

Related: https://github.com/dotnet/runtime/issues/1760

Syscall: https://man7.org/linux/man-pages/man2/pidfd_getfd.2.html

It should be possible to use this syscall to implement DuplicateAndClose, it seems with it Linux no longer fundamentally differs from Windows' WSADuplicateSocket. Though I can imagine the ptrace permission requirement may be problematic.

Contributor guide

Research direction
Investigate the pidfd getfd syscall and its permission requirements, then implement Socket.DuplicateAndClose in the .NET runtime's System.Net.Sockets layer.
Tech stack
csharp
Domain
backendapi
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-2 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Mostly clear
Prerequisites
C#Linux syscalls
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
20