/* Access for application keys in mmap'd malloc managed region.   Copyright 1992 Free Software Foundation, Inc.   Contributed by Fred Fish at Cygnus Support.   fnf@cygnus.comThis program is free software; you can redistribute it and/or modifyit under the terms of the GNU General Public License as published bythe Free Software Foundation; either version 2 of the License, or(at your option) any later version.This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty ofMERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See theGNU General Public License for more details.You should have received a copy of the GNU General Public Licensealong with this program; if not, write to the Free SoftwareFoundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  *//* This module provides access to some keys that the application can use to   provide persistent access to locations in the mapped memory section.   The intent is that these keys are to be used sparingly as sort of   persistent global variables which the application can use to reinitialize   access to data in the mapped region.   For the moment, these keys are simply stored in the malloc descriptor   itself, in an array of fixed length.  This should be fixed so that there   can be an unlimited number of keys, possibly using a multilevel access   scheme of some sort. */#include "mmalloc.h"intmmalloc_setkey (md, keynum, key)  PTR md;       int keynum;  PTR key;{  struct mdesc *mdp = (struct mdesc *) md;  int result = 0;  if ((mdp != NULL) && (keynum >= 0) && (keynum < MMALLOC_KEYS))    {      mdp -> keys [keynum] = key;      result++;    }  return (result);}PTRmmalloc_getkey (md, keynum)  PTR md;       int keynum;{  struct mdesc *mdp = (struct mdesc *) md;  PTR keyval = NULL;  if ((mdp != NULL) && (keynum >= 0) && (keynum < MMALLOC_KEYS))    {      keyval = mdp -> keys [keynum];    }  return (keyval);}