| 1 | /* Access for application keys in mmap'd malloc managed region. |
| 2 | Copyright 1992 Free Software Foundation, Inc. |
| 3 | |
| 4 | Contributed by Fred Fish at Cygnus Support. fnf@cygnus.com |
| 5 | |
| 6 | This file is part of the GNU C Library. |
| 7 | |
| 8 | The GNU C Library is free software; you can redistribute it and/or |
| 9 | modify it under the terms of the GNU Library General Public License as |
| 10 | published by the Free Software Foundation; either version 2 of the |
| 11 | License, or (at your option) any later version. |
| 12 | |
| 13 | The GNU C Library is distributed in the hope that it will be useful, |
| 14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 16 | Library General Public License for more details. |
| 17 | |
| 18 | You should have received a copy of the GNU Library General Public |
| 19 | License along with the GNU C Library; see the file COPYING.LIB. If |
| 20 | not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
| 21 | Boston, MA 02111-1307, USA. */ |
| 22 | |
| 23 | /* This module provides access to some keys that the application can use to |
| 24 | provide persistent access to locations in the mapped memory section. |
| 25 | The intent is that these keys are to be used sparingly as sort of |
| 26 | persistent global variables which the application can use to reinitialize |
| 27 | access to data in the mapped region. |
| 28 | |
| 29 | For the moment, these keys are simply stored in the malloc descriptor |
| 30 | itself, in an array of fixed length. This should be fixed so that there |
| 31 | can be an unlimited number of keys, possibly using a multilevel access |
| 32 | scheme of some sort. */ |
| 33 | |
| 34 | #include "mmprivate.h" |
| 35 | |
| 36 | int |
| 37 | mmalloc_setkey (md, keynum, key) |
| 38 | PTR md; |
| 39 | int keynum; |
| 40 | PTR key; |
| 41 | { |
| 42 | struct mdesc *mdp = (struct mdesc *) md; |
| 43 | int result = 0; |
| 44 | |
| 45 | if ((mdp != NULL) && (keynum >= 0) && (keynum < MMALLOC_KEYS)) |
| 46 | { |
| 47 | mdp -> keys [keynum] = key; |
| 48 | result++; |
| 49 | } |
| 50 | return (result); |
| 51 | } |
| 52 | |
| 53 | PTR |
| 54 | mmalloc_getkey (md, keynum) |
| 55 | PTR md; |
| 56 | int keynum; |
| 57 | { |
| 58 | struct mdesc *mdp = (struct mdesc *) md; |
| 59 | PTR keyval = NULL; |
| 60 | |
| 61 | if ((mdp != NULL) && (keynum >= 0) && (keynum < MMALLOC_KEYS)) |
| 62 | { |
| 63 | keyval = mdp -> keys [keynum]; |
| 64 | } |
| 65 | return (keyval); |
| 66 | } |