Segmentation violation after reading from file

[Peter Van Osta <pvosta unionbio-eu com>]

Hi,

I am currently implementing the sorage and retrieval of CORBA structures 
and I am getting segmentation violations when retrieving the objects 
(example se below). Wrting them to disk works as it doesn't give any 
errors, but the retrieval of the structures and their transfer back to 
the client causes a crash at the moment of the transfer.

Everything looks fine until the actual transfer back to the client.
The structures contain "strings", should I copy those subelements 
intdividualy with "CORBA_string_dup" or allocate them before sensidng 
them back ?

The error only occurs in those structures where I have changed the 
content of a "string" element prior to wrting them to disk and the 
segmentation violation then occurs at the moment when the copmplete 
structre is retreived over the ORBit link from server to client.

I print our the conntent of all the strings in the structure before 
transfer and their content is valid on the server side.

What am I doing wrong in retrieving these structures from disk and 
sending them back from the server to the client. On both the client and 
the server the objects and their string subelementts are allocated at 
startup.

Best regards,

Peter Van Osta


----------------------------------------------


e.g.: 
ezxrdrprotocol_srvr->name = CORBA_string_dup( "-" );
	ezxrdrprotocol_srvr->location = CORBA_string_alloc(EZX_FIL_NAMLEN );
	

exerpt from a function which handles the retrieval of data from disk and 
sends the result tot the client:
	int status = IE_OK;
	EzxS_EzxRdrDatastoreObj *retval = NULL;
	int val = 0;
	FILE *fp = NULL;
	char filbuf[EZX_FIL_PATHLEN];

...

	*filbuf = '\0';
	
	*message = CORBA_string_dup( "-" );

	/* Always allocate this first */
	retval = EzxS_EzxRdrDatastoreObj__alloc( );
	retval = ORBit_copy_value( Ezxstrg, TC_EzxS_EzxRdrDatastoreObj );

	ezxrdrdatastore_srvr = ORBit_copy_value( Ezxstrg, 
TC_EzxS_EzxRdrDatastoreObj );

	sprintf( filbuf, "%s%c%s", ezxrdrdatastore_srvr->protocol, DIRSEP, 
"Ezx_Storage.ezp" );
	
	if( bugfind == TRUE )fprintf( stdout, "Reading: %s\n", filbuf );

	fp = fopen( filbuf, "rb" );
	if( !fp )
		status = IE_FILE;
	
	if( fp ){
		val = fread( retval, sizeof( ezxrdrdatastore_srvr ), 1, fp );
		if( ferror( fp ) || feof( fp ) )
			status = IE_FILE;
	}
	
	if( fp ){
		if( fclose( fp ) == EOF )
			status  = IE_FILE;
	}

	/* Make sure server object matches client object */
	if( status >= IE_OK )
		ezxrdrdatastore_srvr = ORBit_copy_value( retval, TC_EzxS_EzxRdrDatastoreObj );

...	
	fprintf( stdout, "Name %s\n", ezxrdrdatastore_srvr->name );
...
	fprintf( stdout, "Name %s\n", retval->name );
...

	return retval;