bug: switch to socket.Dup in eventloop.enroll to enable close-on-exec

[panjf2000]

No description provided.

[Copilot]

Pull request overview

This PR refactors file descriptor duplication to use socket.Dup instead of unix.Dup, automatically enabling the close-on-exec flag to prevent file descriptor leaks when forking processes.

• Replaces unix.Dup with socket.Dup for automatic close-on-exec handling
• Removes redundant manual unix.CloseOnExec calls in client code
• Ensures consistent file descriptor duplication behavior across the codebase

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
eventloop_unix.go	Updated enroll method to use socket.Dup for duplicating file descriptors with close-on-exec flag
client_unix.go	Replaced unix.Dup + unix.CloseOnExec with socket.Dup call in EnrollContext method for cleaner implementation

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.30%. Comparing base (58d255f) to head (0c3e6f8).
⚠️ Report is 37 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #746      +/-   ##
==========================================
- Coverage   84.31%   84.30%   -0.01%     
==========================================
  Files          22       22              
  Lines        2403     2402       -1     
==========================================
- Hits         2026     2025       -1     
  Misses        257      257              
  Partials      120      120              

Flag	Coverage Δ
unittests	84.30% <100.00%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.