/*-------------------------------------------------------------------------
 *
 * dynloader.c
 *	  Dynamic Loader for Postgres for BeOS
 *
 * Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 *
 * IDENTIFICATION
 *	  $Header: /cvsroot/pgsql/src/backend/port/dynloader/Attic/beos.c,v 1.6 2001/02/10 02:31:26 tgl Exp $
 *
 *-------------------------------------------------------------------------
 */

#include "postgres.h"

#include "utils/dynamic_loader.h"


void	   *
pg_dlopen(char *filename)
{
	image_id* im; 
	
	/* Handle memory allocation to store the Id of the shared object*/
	im=(image_id*)(malloc(sizeof(image_id)));
	
	/* Add-on loading */
	*im=beos_dl_open(filename);
			
	return im;
}


char	   *
pg_dlerror()
{
	static char errmsg[] = "Load Add-On failed";
	return errmsg;
}

PGFunction 
pg_dlsym(void *handle, char *funcname)
{
	PGFunction fpt;

	/* Checking that "Handle" is valid */
	if ((handle) && ((*(int*)(handle))>=0))
	{
		/* Loading symbol */
		if(get_image_symbol(*((int*)(handle)),funcname,B_SYMBOL_TYPE_TEXT,(void**)&fpt)==B_OK);
		{
			/* Sometime the loader return B_OK for an inexistant function with an invalid address !!! 
			Check that the return address is in the image range */
			image_info info;
			get_image_info(*((int*)(handle)),&info);
			if ((fpt<info.text) || (fpt>=(info.text+info.text_size))) return NULL;
			return fpt;
		}
		elog(NOTICE, "loading symbol '%s' failed ",funcname);
	}
	elog(NOTICE, "add-on not loaded correctly");
	return NULL;
}

void 
pg_dlclose(void *handle)
{
	/* Checking that "Handle" is valid */
	if ((handle) && ((*(int*)(handle))>=0))
	{
		if (beos_dl_close(*(image_id*)handle)!=B_OK)
			elog(NOTICE, "error while unloading add-on");
		free(handle);
	}
}
