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condor_file_append.h

/***************************************************************
 *
 * Copyright (C) 1990-2007, Condor Team, Computer Sciences Department,
 * University of Wisconsin-Madison, WI.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you
 * may not use this file except in compliance with the License.  You may
 * obtain a copy of the License at
 * 
 *    http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 ***************************************************************/


#ifndef CONDOR_FILE_APPEND_H
#define CONDOR_FILE_APPEND_H

/*
This class passes all operations through, except open.
For open(), it forces the O_APPEND flag to be set.
*/


#include "condor_file.h"

class CondorFileAppend : public CondorFile {
public:
      CondorFileAppend( CondorFile *original );
      virtual ~CondorFileAppend();

      virtual int open( const char *url, int flags, int mode );
      virtual int close();
      virtual int read( int offset, char *data, int length );
      virtual int write( int offset, char *data, int length );

      virtual int fcntl( int cmd, int arg );
      virtual int ioctl( int cmd, long arg );
      virtual int ftruncate( size_t length ); 
      virtual int fsync();
      virtual int flush();
      virtual int fstat( struct stat *buf );

      virtual int is_readable();
      virtual int is_writeable();
      virtual int is_seekable();

      virtual int get_size();
      virtual char const      *get_url();

      virtual int get_unmapped_fd();
      virtual int is_file_local();

private:
      char *url;
      CondorFile *original;
};

#endif

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