[pull] master from php:master#834
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Several memory-safety issues in the new Io\Poll API, found by review and confirmed under valgrind: - Watcher kept a raw pointer to its Context's php_poll_ctx with no reference, so dropping the Context while holding a Watcher left remove()/modify() dereferencing freed memory (use-after-free). The Context now neutralizes its watchers (active=false, poll_ctx=NULL) before it is destroyed, so those calls throw InactiveWatcherException. - StreamPollHandle took a reference on the stream resource in the constructor but never released it, leaking the descriptor for the rest of the request. Store the zend_resource and release it in the handle cleanup; the php_stream may already be freed by then (e.g. the user closed it), so the cleanup must not dereference it. - Watcher and Context had no get_gc handler, so reference cycles through Watcher::$data were uncollectable. Add get_gc for both. - Context, Watcher and StreamPollHandle were cloneable through the default handler, which shallow-copied the backing php_poll_ctx and the watcher map by pointer and double-freed them on destruction. Mark all three uncloneable. - Calling __construct() a second time on a Context or StreamPollHandle replaced the backing context or handle data without releasing the first, leaking it. Throw if the object is already constructed. - The add(), modify(), remove() and wait() entry points accepted a NULL ctx and forwarded it to php_poll_set_error(), which dereferenced it. The userland layer already gates on an active context before reaching the C API, so assert a non-NULL ctx in those entry points instead. Closes GH-22316
/* */ comments are ignored by the stub parser.
In Autotools these aren't installed and neither are there any public headers.
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