DB2 UDF written in C

I am trying to a create a DB2 function that writes output to a file.
I am close, but it does not seem to work. Does anyone know what the
problem could be ?




/*                                       
    This method will be called from DB2  
                                         
*/                                       
#include <stdio.h>
#include <time.h>

void DEBUGOUT( char* fileName,             
    char* message,                      
    int* ValRet,                         
    short* inind,                        
    short* outind,                       
    char* sqlstate,                      
    char* funcname,                      
    char* specname,                      
    char* msgtext )                      
{                                       
        FILE *fp;
        char *fileType; 
        time_t  now;
        struct tm *ptr;
        char buf1[20];

        if( ( fp = fopen( fileName, "a" )) != NULL )
        {
                time( &now );
                ptr = localtime( &now );
                strftime(buf1, 80, "%m/%d/%y %H:%M:%S %p", ptr);

                *ValRet = fprintf( fp, "%s %s\n", buf1, message  );

                fclose( fp );
        }
        else
        {
            *ValRet = 0;
            *outind = 0;                        
        }
}  



CRTCMOD MODULE(PGMRPGMLIB/DEBUGOUT) SRCFILE(PGMRSRCLIB/CSRC) DBGVIEW(*SOURCE)
CRTSRVPGM SRVPGM(PGMRPGMLIB/DEBUGOUT) EXPORT(*ALL) ACTGRP(*CALLER)



CREATE FUNCTION PGMRPGMLIB/DEBUGOUT( VARCHAR(50), VARCHAR(50) )    
RETURNS INTEGER                                       
EXTERNAL NAME 'PGMRPGMLIB/DEBUGOUT(DEBUGOUT)'                
LANGUAGE C                                            
NO SQL                                                
PARAMETER STYLE SQL                                   
DETERMINISTIC;             

               


select ( '/tmp/out.txt', 'Hello' ) from sysibm/sysdummy1

I am only getting back 0.


-Thanks
Steve More