Thread: how to get the connected session pointer ( Archive * AH)

On Tue, Oct 22, 2013 at 1:32 AM, AI Rumman <rummandba@gmail.com> wrote:
> Hi,
>
> Is there a way in Postgresql C function to get the connected session pointer
> ( Archive * AH)
> and use it for further execution?

If I read pg_archiver.c correctly, the AH pointer is used only during
the archiving and is not "globally" stored anywhere, and therefore I
suspect the answer is NO (at least unless you modify the archiver).
What is the aim of having such pointer?

Luca

AI Rumman <rummandba@gmail.com> writes:
> I have a libpq C interface code which takes user/password to connect to the
> db. Now, I want to call it from a pgsql function where user will not need
> to put any user name or password, rather it will use the current session ID.
> How can I do it? Any idea, please.

It sounds to me like you're trying to reinvent the foreign-data-wrapper
user identity functionality, and not very well at that.

            regards, tom lane

On 10/22/2013 9:27 AM, AI Rumman wrote:
> I have a libpq C interface code which takes user/password to connect
> to the db. Now, I want to call it from a pgsql function where user
> will not need to put any user name or password, rather it will use the
> current session ID.
> How can I do it? Any idea, please.


you shouldn't be calling libpq from within a postgres C function at all.

if you want to make queries on the same database, use the SPI interface,
see http://www.postgresql.org/docs/current/static/spi.html

If you want to connect to another database, use postgres_fdw

--
john r pierce                                      37N 122W
somewhere on the middle of the left coast