Re: How to know killed by pg_terminate_backend

On Thu, May 13, 2010 at 8:20 PM, Tatsuo Ishii <ishii@postgresql.org> wrote:
>> > Maybe we could make PostgreSQL a little bit smarter so that it returns
>> > a different code than 57P01 when killed by pg_terminate_backend().
>>
>> Seems reasonable. Does the victim backend currently know why it has been
>> killed?
>
> I don't think so.
>
> One idea is postmaster sets a flag in the shared memory area
> indicating it rceived SIGTERM before forwarding the signal to
> backends.
>
> Backend check the flag and if it's not set, it knows that the signal
> has been sent by pg_terminate_backend(), not postmaster.

Or it could also be sent by some other user process, like the user
running "kill" from the shell.

-- 
Robert Haas
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