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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