{
    Tcl_Interp *target;
    LoadedPackage *pkgPtr;
    InterpPackage *ipPtr;
    Tcl_Obj *resultObj, *pkgDesc[2];

    if (targetName == NULL) {
	resultObj = Tcl_NewObj();
	TclNewObj(resultObj);
	Tcl_MutexLock(&packageMutex);
	for (pkgPtr = firstPackagePtr; pkgPtr != NULL;
		pkgPtr = pkgPtr->nextPtr) {
	    pkgDesc[0] = Tcl_NewStringObj(pkgPtr->fileName, -1);
	    pkgDesc[1] = Tcl_NewStringObj(pkgPtr->packageName, -1);
	    Tcl_ListObjAppendElement(NULL, resultObj,
		    Tcl_NewListObj(2, pkgDesc));

    }

    /*
     * Return information about only the packages that are loaded in a given
     * interpreter.
     */

    resultObj = Tcl_NewObj();
    TclNewObj(resultObj);
    for (; ipPtr != NULL; ipPtr = ipPtr->nextPtr) {
	pkgPtr = ipPtr->pkgPtr;
	pkgDesc[0] = Tcl_NewStringObj(pkgPtr->fileName, -1);
	pkgDesc[1] = Tcl_NewStringObj(pkgPtr->packageName, -1);
	Tcl_ListObjAppendElement(NULL, resultObj, Tcl_NewListObj(2, pkgDesc));
    }
    Tcl_SetObjResult(interp, resultObj);