send keepalives during checksum operations in daemon mode #840
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This is an experimental PR that helps to prevent timeouts during file list generation with
--checksum.Even with
--timeout=xxxfar exceeding file list generation time, both client and server end up stuck atpselect6()forever. I have triedSO_KEEPALIVEand all combinations of partial/whole recursive, non-recursive, etc etc. Nothing really helps.I have NOT extensively tested it, but it resolves my issue #839.