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Thread-Topic: Q: ZEND_HANDLE_STREAM and wincache extension on PHP 5.4
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Date: Thu, 15 Mar 2012 18:56:11 +0000
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Subject: Q: ZEND_HANDLE_STREAM and wincache extension on PHP 5.4
From: ericsten@microsoft.com (Eric Stenson)

PHP Internals folks--

My name is Eric Stenson, and I'm a developer at Microsoft working on IIS.
I've been given the task of upgrading our php_wincache extension to work=20
on PHP5.4, and I've run into a problem.

The problem I'm running into is the php_cgi!main() on PHP5.4 has changed
behavior.=A0 The php_cgi!main() function is seeing us return a ZEND_HANDLE_=
STREAM,
and it's assuming that the zend_file_handle.handle.stream.handle (void *)
is a (php_stream*), when in fact it's php_wincache's (fcache_handle *).
It then attempts to access the php_stream.ops (a v-table-ish struct), which
is not in the fcache_handle, and it jumps off into an invalid address and
promptly AV's.

I'm trying to understand why our php_wincache!fcache_useval() thinks it's
okay to set zend_file_handle.handle.stream.handle to (fcache_handle *).
I'm having trouble understanding what the responsibilities are of a PHP
extension that extends the file system as php_wincache does.=A0 Could you
point me at any developer documents for PHP extension developers that expla=
ins
what php_wincache *should* be doing?

I'm very much a novice at PHP code, or writing a PHP extension, so I feel
like I'm flailing around without understanding what PHP extensions are=20
supposed to do.=A0 Any pointers, guidance, and architecture advice would be
massively helpful!

Thank you!
=A0=A0=A0=A0=A0=A0=A0=A0=A0 --E.