Handle fsync failures in pg_receivewal and pg_recvlogical
It is not safe to simply report an fsync error and continue. We must
exit the program instead.
Reviewed-by: Michael Paquier <michael@paquier.xyz>
Reviewed-by: Sehrope Sarkuni <sehrope@jackdb.com>
Discussion: https://www.postgresql.org/message-id/flat/
9b49fe44-8f3e-eca9-5914-
29e9e99030bf@2ndquadrant.com