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Date: Wed, 26 Aug 2020 10:00:34 +0200
Message-ID: <CACsECNcgub9+oOoWUachMCV4+wT6F9moHMew14YKHaDCu2g8Cg@mail.gmail.com>
To: Ivan Zanev <ivanzanev477@gmail.com>
Cc: Levi Morrison <levi.morrison@datadoghq.com>, PHP internals <internals@lists.php.net>
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Subject: Re: [PHP-DEV] Segmentation Fault when trying to call zend_new_array.
From: alexinbeijing@gmail.com (Alex)

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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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