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Reply-To: Levi Morrison <levi.morrison@datadoghq.com>
Date: Tue, 25 Aug 2020 05:39:24 -0600
Message-ID: <CAAKU0um1MF-OBFJ7qY8XzVvz=ZKN2R00x-CMzkM=df7tqbCXwg@mail.gmail.com>
To: Ivan Zanev <ivanzanev477@gmail.com>
Cc: PHP internals <internals@lists.php.net>
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Subject: Re: [PHP-DEV] Segmentation Fault when trying to call zend_new_array.
From: internals@lists.php.net ("Levi Morrison via internals")

On Tue, Aug 25, 2020 at 5:31 AM Ivan Zanev <ivanzanev477@gmail.com> wrote:
>
> Hello,
>
> I'm trying to learn a bit more about HashTable in PHP internally and how
> memory is allocated when generating arrays with various sizes. I created a
> simple C script that would call
>
> HashTable *ht = zend_new_array(15);
>
> However, when I compile the script with gcc, I get segmentation fault; gdb
> tells that the problem is located within _emalloc_56, specifically:
>
> 2535 if (UNEXPECTED(AG(mm_heap)->use_custom_heap)) {
>
> That's how I compiled the script:
> gcc -I./Zend -I. -I./TSRM -I./main Zend/*.c TSRM/TSRM.c test.c -ldl -lm -g
>
> For the configuration I used:
> ./configure
>
> Could you please guide me in the right direction? Is there something I
> should do before calling zend_new_array?
>
> Sincerely,
> Ivan

Does `test.c` include a main? If so you probably want to use the embed
SAPI. If not then you probably want to build it as an extension.