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markom |
/* Access for application keys in mmap'd malloc managed region.
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Copyright 1992 Free Software Foundation, Inc.
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Contributed by Fred Fish at Cygnus Support. fnf@cygnus.com
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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/* This module provides access to some keys that the application can use to
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provide persistent access to locations in the mapped memory section.
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The intent is that these keys are to be used sparingly as sort of
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persistent global variables which the application can use to reinitialize
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access to data in the mapped region.
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For the moment, these keys are simply stored in the malloc descriptor
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itself, in an array of fixed length. This should be fixed so that there
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can be an unlimited number of keys, possibly using a multilevel access
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scheme of some sort. */
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#include "mmprivate.h"
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int
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mmalloc_setkey (md, keynum, key)
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PTR md;
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int keynum;
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PTR key;
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{
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struct mdesc *mdp = (struct mdesc *) md;
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int result = 0;
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if ((mdp != NULL) && (keynum >= 0) && (keynum < MMALLOC_KEYS))
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{
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mdp -> keys [keynum] = key;
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result++;
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}
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return (result);
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}
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PTR
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mmalloc_getkey (md, keynum)
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PTR md;
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int keynum;
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{
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struct mdesc *mdp = (struct mdesc *) md;
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PTR keyval = NULL;
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if ((mdp != NULL) && (keynum >= 0) && (keynum < MMALLOC_KEYS))
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{
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keyval = mdp -> keys [keynum];
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}
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return (keyval);
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}
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