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(parent: f5e4ded) | patch

Allow SIGINT to cancel psql database reconnections.

Allow SIGINT to cancel psql database reconnections.

After installing the SIGINT handler in psql, SIGINT can no longer cancel
database reconnections. For instance, if the user starts a reconnection
and then needs to do some form of interaction (ie psql is polling),
there is no way to cancel the reconnection process currently.

Use PQconnectStartParams() in order to insert a cancel_pressed check
into the polling loop.

Tristan Partin, reviewed by Gurjeet Singh, Heikki Linnakangas, Jelte
Fennema-Nio, and me.

Discussion: http://postgr.es/m/D08WWCPVHKHN.3QELIKZJ2D9RZ@neon.tech

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