Re: how to register an event handler for the instance

[Tzvetomir Stoyanov <tz.stoyanov@gmail.com>]

On Fri, May 6, 2022 at 7:18 PM christopher lee
<christopher.lee.eu@gmail.com> wrote:
>
> Hi all,
>
> I use libtraceevent in my trace tool to parse the event log. Now I
> allocated an instance, but no idea how to use
> tep_register_event_handler() to register a handler for the instance. Is
> it possilbe to register handler for the event in the instance?
>

Hi Chrit,
All trace events are the same across all trace instances, thus the
handler registered with tep_register_event_handler() handles events
from all instances with a given id. That's why there are no "instance"
oriented APIs in that library. I would suggest looking at the tracefs
library, which is instance aware. It can be used to allocate trace
instances and read events from a given instance.

https://trace-cmd.org/Documentation/libtracefs/

> https://trace-cmd.org/Documentation/libtraceevent/libtraceevent-reg_event_handler.html
>
> thanks for any information.
>
> Best regards,
> Chrit



-- 
Tzvetomir (Ceco) Stoyanov
VMware Open Source Technology Center