[PurHur]

Summary

• php-in-php: VmSockets::atmark — prefer libc sockatmark FFI, drop host socket_atmark() delegation (#6544 phase 2) #7998 / Stdlib: socket_atmark() — TCP urgent-data OOB probe missing (ext/sockets/sockets.c) #6544 phase 2: VmSockets::atmark() now calls libc sockatmark(3) via FFI before any host \socket_atmark() fallback — self-host no longer prefers Zend ext/sockets when FFI is available.
• socket_atmark() builtin uses BuiltinExecute::writeReturn so socket arg validation runs even when the return is discarded (Stdlib: VM builtins skip arg validation when return is discarded (returnVar null early-return) #5896 pattern).
• Regression guard: test/unit/VmSocketsRuntimeShrinkTest.php.

C runtime: 0 lines added/changed (PHP + libc FFI only).

php-src reference

• ext/sockets/sockets.c — PHP_FUNCTION(socket_atmark) → sockatmark(2)

Verification

docker info >/dev/null
./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && vendor/bin/phpunit --filter VmSocketsRuntimeShrinkTest'

PHPUnit 9.6.21 by Sebastian Bergmann and contributors.
...                                                                 3 / 3 (100%)
OK (3 tests, 8 assertions)

Closes #7998

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