[PATCH] Reload SSL certificates on SIGHUP

Hi,

I have written a patch which makes it possible to change SSL
certificates (and other SSL parameters, including the CRL) without
restarting PostgreSQL. In fact this patch also makes it possible to turn
on or off ssl entirely without restart. It does so by initializing a new
SSL context when the postmaster receives a SIGHUP, and if the
initialization succeeded the old context is replaced by the new.

There was some previous discussion[1] on the mailing list about what the
proper context should be for the SSL parameters, but as far as I can
tell the discussion never reached a conclusion. I have changed the SSL
GUCs to PGC_SIGUP since I felt that was the closest to the truth, but it
is not a perfect fit (the backends wont reload the SSL context). Should
we add a new context for the SSL GUCs?

Notes

1.

http://www.postgresql.org/message-id/flat/CAAS3tyLJcv-m0CqfMrrxUjwa9_FKscKuAKT9_L41wNuJZywM2Q@mail.gmail.com#CAAS3tyLJcv-m0CqfMrrxUjwa9_FKscKuAKT9_L41wNuJZywM2Q@mail.gmail.com

Andreas