M1I06: ForkSharedProxy

[s2x]

Summary

Item	Detail
Proxy	ForkSharedProxy
Socket option	SO_REUSEADDR only (no SO_REUSEPORT)
Bind	0.0.0.0:$port
Listen	SOMAXCONN
isSupported()	Always true
accept()	Delegates to $socket->accept()

Acceptance criteria

• Implements SocketProxyInterface
• isSupported() always returns true
• Uses only SO_REUSEADDR (no SO_REUSEPORT)
• Test passes on all platforms

Closes #8

[s2x]

Review Summary — Round 1

#	Severity	File:Line	Finding
—	—	—	No findings

What Checked

• Code smells & logic errors: clean, mirrors ReusePortProxy pattern correctly
• Security & leaks: no secrets, PII, or injection vectors
• Issue #8 compliance: all 4 acceptance criteria met
• Tests: 4/4 pass, 6 assertions

Follow-up Observations

• The $protocol parameter in SocketProxyInterface::createSocket() goes unused by both ForkSharedProxy and ReusePortProxy (both hardcode SOCK_STREAM/SOL_TCP). It will gain meaning when TLS/UDP proxies arrive in later milestones — no action needed now.
• No PHPDoc annotations on methods — consistent with existing ReusePortProxy style.

What's Fine ✔️

• Implementation is a minimal, correct subset of ReusePortProxy omitting only SO_REUSEPORT
• Error handling pattern (@socket_create + === false check + custom exception) matches existing code
• Test structure identical to ReusePortProxyTest — covers interface check, socket creation, accept with client connection, and isSupported()
• Bind 0.0.0.0:$port, listen SOMAXCONN exactly as specified