cde/programs/dtksh/ksh93/src/lib/libast/vmalloc/vmset.c

   1 /*
   2  * CDE - Common Desktop Environment
   3  *
   4  * Copyright (c) 1993-2012, The Open Group. All rights reserved.
   5  *
   6  * These libraries and programs are free software; you can
   7  * redistribute them and/or modify them under the terms of the GNU
   8  * Lesser General Public License as published by the Free Software
   9  * Foundation; either version 2 of the License, or (at your option)
  10  * any later version.
  11  *
  12  * These libraries and programs are distributed in the hope that
  13  * they will be useful, but WITHOUT ANY WARRANTY; without even the
  14  * implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
  15  * PURPOSE. See the GNU Lesser General Public License for more
  16  * details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with these librararies and programs; if not, write
  20  * to the Free Software Foundation, Inc., 51 Franklin Street, Fifth
  21  * Floor, Boston, MA 02110-1301 USA
  22  */
  23 /* $XConsortium: vmset.c /main/2 1996/05/08 20:05:28 drk $ */
  24 /***************************************************************
  25 *                                                              *
  26 *                      AT&T - PROPRIETARY                      *
  27 *                                                              *
  28 *         THIS IS PROPRIETARY SOURCE CODE LICENSED BY          *
  29 *                          AT&T CORP.                          *
  30 *                                                              *
  31 *                Copyright (c) 1995 AT&T Corp.                 *
  32 *                     All Rights Reserved                      *
  33 *                                                              *
  34 *           This software is licensed by AT&T Corp.            *
  35 *       under the terms and conditions of the license in       *
  36 *       http://www.research.att.com/orgs/ssr/book/reuse        *
  37 *                                                              *
  38 *               This software was created by the               *
  39 *           Software Engineering Research Department           *
  40 *                    AT&T Bell Laboratories                    *
  41 *                                                              *
  42 *               For further information contact                *
  43 *                     gsf@research.att.com                     *
  44 *                                                              *
  45 ***************************************************************/
  46 #include        "vmhdr.h"
  47
  48
  49 /*      Set the control flags for a region.
  50 **
  51 **      Written by (Kiem-)Phong Vo, kpv@research.att.com, 01/16/94.
  52 */
  53 #if __STD_C
  54 vmset(reg Vmalloc_t* vm, int flags, int on)
  55 #else
  56 vmset(vm, flags, on)
  57 reg Vmalloc_t*  vm;     /* region being worked on               */
  58 int             flags;  /* flags must be in VM_FLAGS            */
  59 int             on;     /* !=0 if turning on, else turning off  */
  60 #endif
  61 {
  62         reg int         mode;
  63         reg Vmdata_t*   vd = vm->data;
  64
  65         if(flags == 0 && on == 0)
  66                 return vd->mode;
  67
  68         if(!(vd->mode&VM_TRUST) )
  69         {       if(ISLOCK(vd,0))
  70                         return 0;
  71                 SETLOCK(vd,0);
  72         }
  73
  74         mode = vd->mode;
  75
  76         if(on)
  77                 vd->mode |=  (flags&VM_FLAGS);
  78         else    vd->mode &= ~(flags&VM_FLAGS);
  79
  80         if(vd->mode&(VM_TRACE|VM_MTDEBUG))
  81                 vd->mode &= ~VM_TRUST;
  82
  83         CLRLOCK(vd,0);
  84
  85         return mode;
  86 }