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d694e0bb79
This function allows us to fsync the specified file or directory. It's useful, for example, when we want to sync the file that pg_file_write() writes out or that COPY TO exports the data into, for durability. Author: Fujii Masao Reviewed-By: Julien Rouhaud, Arthur Zakirov, Michael Paquier, Atsushi Torikoshi Discussion: https://www.postgresql.org/message-id/CAHGQGwGY8uzZ_k8dHRoW1zDcy1Z7=5GQ+So4ZkVy2u=nLsk=hA@mail.gmail.com