Re: libpq support for NegotiateProtocolVersion

On Tue, Nov 15, 2022 at 2:19 AM Peter Eisentraut
<peter(dot)eisentraut(at)enterprisedb(dot)com> wrote:
> I think for the current code, the following would be an appropriate
> adjustment:
>
> diff --git a/src/interfaces/libpq/fe-connect.c
> b/src/interfaces/libpq/fe-connect.c
> index 746e9b4f1efc..d15fb96572d9 100644
> --- a/src/interfaces/libpq/fe-connect.c
> +++ b/src/interfaces/libpq/fe-connect.c
> @@ -3412,8 +3412,7 @@ PQconnectPoll(PGconn *conn)
> /* Get the type of request. */
> if (pqGetInt((int *) &areq, 4, conn))
> {
> - /* We'll come back when there are more data */
> - return PGRES_POLLING_READING;
> + goto error_return;
> }
> msgLength -= 4;
>
> And then the handling of the 'v' message in my patch would also be
> adjusted like that.

Yes -- though that particular example may be dead code, since we
should have already checked that there are at least four more bytes in
the buffer.

--Jacob