dotnet/runtime

Socket: AcceptAsync receiving first block not implemented on Unix

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#40,374 opened on Aug 5, 2020

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area-System.Net.Socketsenhancementhelp wanted

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Description

This is a follow-up on https://github.com/dotnet/runtime/issues/32633#issuecomment-667192865.

Windows has a built-in support for receiving bytes with AcceptEx, which can be utilized by BeginAccept/EndAccept overloads and AcceptAsync(SocketAsyncEventArgs). Since such a socket operation does not exist on Unix, we throw PlatformNotSupportedException on those platforms. We may consider emulating this feature instead.

Related: #1483

Contributor guide

Research direction
Study the existing Windows AcceptEx implementation in the dotnet/runtime repository (System.Net.Sockets) and research Unix socket emulation techniques (e.g., accept with MSG PEEK, read after accept) to propose an approach for emulating AcceptAsync receiving first block on Unix.
Tech stack
csharp
Domain
networkingbackend
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
4
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
Over 1 week
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
C#GitUnix socket programming
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
25