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In-Reply-To: <CAAKU0um1MF-OBFJ7qY8XzVvz=ZKN2R00x-CMzkM=df7tqbCXwg@mail.gmail.com>
Date: Wed, 26 Aug 2020 10:28:53 +0300
Message-ID: <CAGBSjDHYH1P7s32jHRzRbDRXWY=4ZBRqTwovPfSx+-v2mbhyzg@mail.gmail.com>
To: Levi Morrison <levi.morrison@datadoghq.com>
Cc: PHP internals <internals@lists.php.net>
Content-Type: multipart/alternative; boundary="0000000000002afc1005adc2c6ef"
Subject: Re: [PHP-DEV] Segmentation Fault when trying to call zend_new_array.
From: ivanzanev477@gmail.com (Ivan Zanev)

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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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