Re: Using fmgr_hook

Sameer Thakur wrote:
> In the process of implementing my own version of sysdate, i was trying
> to use the fmgr_hook.

[...]

> To debug i have a breakpoint inside custom_fmgr_hook.
> 
> Debugging:
> 1. Start postgres
> 2. Start psql connecting to postgres
> 3. Attach gdb to process spawned off by postmaster  representing psql session.
> 4. execute select * from now();
> 
> Problem:
>  The breakpoint seems to get skipped. Just to be sure i put a
> breakpoint in explain_ExecutorStart and i could debug that function.
> So i am attaching gdb to correct process.
> What am i doing wrong?

My experience is that you cannot set breakpoints before the library
is loaded, so you first have to call a function in the library, then
you interrupt and set the breakpoint.

I don't know if there is a way to get around that with gdb on Linux.

Yours,
Laurenz Albe