Joachim Wieland <joe@mcknight.de> writes:
> If we use the same signal for both cases, the receiving backend cannot
> tell what the intention of the sending backend was. That's why I
> proposed to make SIGINT similar to SIGUSR1 where we write a reason to
> a shared memory structure first and then send the signal (see
> http://archives.postgresql.org/pgsql-hackers/2009-12/msg02067.php from
> a few days ago).
This seems like a fairly bad idea. One of the intended use-cases is to
be able to manually "kill -INT" a misbehaving backend. Assuming that
there will be valid info about the signal in shared memory will break
that.
regards, tom lane