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For Applications like xrdcp or FUSE mounts it would be very beneficial to have an API like

      XRootDStatus Read( uint64_t         offset,
                         uint32_t         size,
                         int                  output_fd, 
                         uint64_t         output_offset,
                         ResponseHandler *handler,
                         uint16_t         timeout = 0 )
                         XRD_WARN_UNUSED_RESULT;

      XRootDStatus Write( uint64_t         offset,
                          uint32_t         size,
                          int                  input_fd, 
                          uint64_t         input_offset,
                          ResponseHandler *handler,
                          uint16_t         timeout = 0 )
                          XRD_WARN_UNUSED_RESULT;

This would allow to simplify the buffer management in particular with asynchronous callsbacks and avoids memory copy operations using splicing. 


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