returns = {0: 'Success',
           1: 'Syntax or usage error',
           2: 'Protocol incompatibility',
           3: 'Errors selecting input/output files, dirs',
           4: ('Requested action not supported: '
               'an attempt was made to manipulate 64-bit files on a platform that cannot support them; '
               'or an option was specified that is supported by the client and not by the server.'),
           5: 'Error starting client-server protocol',
           6: 'Daemon unable to append to log-file',
           10: 'Error in socket I/O',
           11: 'Error in file I/O',
           12: 'Error in rsync protocol data stream',
           13: 'Errors with program diagnostics',
           14: 'Error in IPC code',
           20: 'Received SIGUSR1 or SIGINT',
           21: 'Some error returned by waitpid()',
           22: 'Error allocating core memory buffers',
           23: 'Partial transfer due to error',
           24: 'Partial transfer due to vanished source files',
           25: 'The --max-delete limit stopped deletions',
           30: 'Timeout in data send/receive',
           35: 'Timeout waiting for daemon connection'}