Support Socket.DuplicateAndClose through pidfd_getfd on Linux

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Assessment

Difficulty
5/5
Estimated time
Over a week
Newbie friendliness
30/100
Issue type
Feature
Clarity
Needs clarification
Activity status
Stale
Tech stack
csharp, linux
Domain
networking, operating-systems

Research direction

Read the pidfd_getfd(2) documentation and related issue #1760, then trace the existing DuplicateAndClose implementation in the runtime. Done means determining whether pidfd_getfd can implement DuplicateAndClose on Linux, including the stated ptrace-permission concern.

Written by the indexing model from the issue text.

Description

area-System.Net.Sockets help wanted

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.

Dominant language
C#
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Forks
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