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Date: Wed, 26 Aug 2020 12:18:32 +0300
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To: Alex <alexinbeijing@gmail.com>
Cc: Levi Morrison <levi.morrison@datadoghq.com>, PHP internals <internals@lists.php.net>
Content-Type: multipart/alternative; boundary="0000000000004365db05adc44e58"
Subject: Re: [PHP-DEV] Segmentation Fault when trying to call zend_new_array.
From: ivanzanev477@gmail.com (Ivan Zanev)

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Thank you!

On Wed, Aug 26, 2020 at 11:00 AM Alex <alexinbeijing@gmail.com> wrote:

> Dear Ivan,
>
> Some suggestions:
>
> - Build your own copy of the PHP embed library using ./configure
> --enable-embed=shared or ./configure --enable-embed=static. Link against
> that.
> - If it doesn't work, get some already-working sample code for use of the
> PHP embed SAPI and modify it rather than starting from scratch.
> - If you are still struggling, run your test under gdb so you can get a
> stack trace when it segfaults. It's as simple as "gdb --args <CLI
> invocation here>". Make sure that both the PHP embed SAPI and your own test
> code were compiled with debug info enabled.
>
> Alex
>
>
>
> On Wed, Aug 26, 2020 at 9:29 AM Ivan Zanev <ivanzanev477@gmail.com> wrote:
>
>> Yes, it does.
>>
>> I recompiled php now with
>>
>> --configure --enable-embed=static
>>
>> and wrote a simple script:
>>
>> #include <stdlib.h>
>> #include <stdio.h>
>>
>> #include "sapi/embed/php_embed.h"
>>
>> int main(int argc, char *argv[]) {
>>         php_embed_init(argc, argv);
>>
>>         HashTable *ht = zend_new_array(15);
>>
>>         return 0;
>> }
>>
>> Compiled with the following command:
>>
>> gcc -I./Zend -I. -I./TSRM -I./main Zend/*.c TSRM/TSRM.c test-embed.c -ldl
>> -lm -lphp7 -g
>>
>> The segmentation fault problem still occurs, when calling  php_embed_init.
>>
>> Not sure if that's a problem of libphp7.so which I installed via apt or it
>> is something related to a missing piece in the test-embed.c script I
>> wrote?
>>
>> On Tue, Aug 25, 2020 at 2:39 PM Levi Morrison <
>> levi.morrison@datadoghq.com>
>> wrote:
>>
>> > 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.
>> >
>>
>

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