Re: [PATCH] Add `verify-system` sslmode to use system CA pool for server cert

Daniel Gustafsson <daniel@yesql.se> writes:
> The attached diff passes the tests on OpenSSL 1.0.1 through 3.1 as well as on
> LibreSSL. Thoughts?

1. You can't assume that errno starts out zero, unless you zero it
right before SSL_connect.

2. I wonder whether it's safe to assume that errno (a/k/a SOCK_ERRNO)
can't be clobbered by SSL_get_verify_result.

3. It seems weird to refer to errno directly just a couple lines away
from where we refer to it via SOCK_ERRNO.  Will this even compile
on Windows?

            regards, tom lane