/data/refman/pasoursint/CMSSW_6_1_2_SLHC4_patch1/src/Utilities/StorageFactory/interface/IOChannel.h

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#ifndef STORAGE_FACTORY_IO_CHANNEL_H
# define STORAGE_FACTORY_IO_CHANNEL_H

# include "Utilities/StorageFactory/interface/IOInput.h"
# include "Utilities/StorageFactory/interface/IOOutput.h"

class IOChannel : public virtual IOInput, public virtual IOOutput
{
public:
  IOChannel (IOFD fd = EDM_IOFD_INVALID);
  virtual ~IOChannel (void);
  // implicit copy constructor
  // implicit assignment operator

  using IOInput::read;
  using IOOutput::write;
  
  virtual IOSize        read (void *into, IOSize n);
  virtual IOSize        readv (IOBuffer *into, IOSize buffers);

  virtual IOSize        write (const void *from, IOSize n);
  virtual IOSize        writev (const IOBuffer *from, IOSize buffers);

  virtual IOFD          fd (void) const;
  virtual void          fd (IOFD value); // FIXME: dangerous?

  virtual void          close (void);

  virtual void          setBlocking (bool value);
  virtual bool          isBlocking (void) const;

protected:
  // System implementation
  bool                  sysclose (IOFD fd, int *error = 0);

private:
  IOFD                  m_fd;           /*< System file descriptor. */
};

#endif // STORAGE_FACTORY_IO_CHANNEL_H