MAPI - check if connection is usable

I am using MAPI C library to talk to multiple monetdb databases. I cache the connection (struct mapi) to reduce overhead. However if a database/machine restarts then the connection is not usable.  How do I determine if a cached connection is usable before actually using it.

I have tried mapi_is_connected() and mapi_ping(). But mapi_ping always returns 0 while mapi_is_connected always returns 1.

Thansk and Regards, Tapomay.

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