[Php86] Polyfill the Io\Poll API#612
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Tracks https://wiki.php.net/rfc/poll_api for PHP 8.6. Requires PHP >= 8.1 (enums); only the Poll backend is available since the polyfill is backed by stream_select().
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Tracks the Polling API RFC targeted at PHP 8.6.
Surface added under
src/Php86/Resources/stubs/:Io\IoException,Io\Poll\PollException, abstractFailedPollOperationException(withERROR_*constants), and the seven specialized exceptions (Failed{ContextInitialization,HandleAdd,WatcherModification,PollWait}Exception,BackendUnavailableException,InactiveWatcherException,HandleAlreadyWatchedException,InvalidHandleException).Io\Poll\Backendenum withAuto,Poll,Epoll,Kqueue,EventPorts,WSAPollcases andisAvailable()/supportsEdgeTriggering()/getAvailableBackends().Io\Poll\Eventenum withRead,Write,Error,HangUp,ReadHangUp,OneShot,EdgeTriggered.Io\Poll\Handlemarker interface (annotated@internalto discourage userland implementations).Io\Poll\Context,Io\Poll\Watcher, and globalStreamPollHandle, with private constructors / not-serializable enforced via reboundClosures and throwing__serialize/__unserialize.Requires PHP >= 8.1 (enums). Backed by
stream_select(), so only thePollbackend is available;Autoresolves to it and the other backends throwBackendUnavailableException.HangUpdetection on sockets usesstream_socket_recvfrom(..., STREAM_PEEK)to non-destructively distinguish "readable with data" from "peer closed".35 unit tests cover the API surface and the event-detection logic.