Обсуждение: Debugging extension with gdb?

Can someone point me to information on how to debug a Postgres extension

with gdb?

I have been able to attach to one but getting breakpoints to work right
and getting the addresses to properly relocate (since the extension
could be loaded anywhere) has been the problem for me.

I have not found anything very definitive yet in searching the net.

Thanks,
PJ

Paul Jones <pbj@cmicdo.com> writes:
> Can someone point me to information on how to debug a Postgres extension
> with gdb?

I've noticed that on some platforms, it works better to attach gdb to the
backend process before you load the extension, but on others, it works
better to attach afterwards.  You might try the opposite procedure from
whatever you were doing.  Other than that, it's mostly Just Worked for
me on any remotely modern platform.  Be sure both the backend and the
extension are compiled with -g, of course.

            regards, tom lane

>________________________________
> From: Tom Lane <tgl@sss.pgh.pa.us>
>To: Paul Jones <pbj@cmicdo.com>
>Cc: "pgsql-general@postgresql.org" <pgsql-general@postgresql.org>
>Sent: Wednesday, November 20, 2013 9:13 AM
>Subject: Re: [GENERAL] Debugging extension with gdb?
>
>
>Paul Jones <pbj@cmicdo.com> writes:
>
>> Can someone point me to information on how to debug a Postgres extension
>> with gdb?
>
>I've noticed that on some platforms, it works better to attach gdb to the
>backend process before you load the extension, but on others, it works
>better to attach afterwards.  You might try the opposite procedure from
>whatever you were doing.  Other than that, it's mostly Just Worked for
>me on any remotely modern platform.  Be sure both the backend and the
>extension are compiled with -g, of course.
>
>            regards, tom lane

After I *carefully* re-read your mail, I realized that I did not have
the entire postgresql compiled with '-g'.  So I went back and re-built
all of it and, behold, I set and caught a breakpoint in the extension.

Thanks!
PJ