usr/src/lib/libast/common/vmalloc/vmsegment.c

   1 /***********************************************************************
   2 *                                                                      *
   3 *               This software is part of the ast package               *
   4 *          Copyright (c) 1985-2010 AT&T Intellectual Property          *
   5 *                      and is licensed under the                       *
   6 *                  Common Public License, Version 1.0                  *
   7 *                    by AT&T Intellectual Property                     *
   8 *                                                                      *
   9 *                A copy of the License is available at                 *
  10 *            http://www.opensource.org/licenses/cpl1.0.txt             *
  11 *         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
  12 *                                                                      *
  13 *              Information and Software Systems Research               *
  14 *                            AT&T Research                             *
  15 *                           Florham Park NJ                            *
  16 *                                                                      *
  17 *                 Glenn Fowler <gsf@research.att.com>                  *
  18 *                  David Korn <dgk@research.att.com>                   *
  19 *                   Phong Vo <kpv@research.att.com>                    *
  20 *                                                                      *
  21 ***********************************************************************/
  22 #if defined(_UWIN) && defined(_BLD_ast)
  23
  24 void _STUB_vmsegment(){}
  25
  26 #else
  27
  28 #include        "vmhdr.h"
  29
  30 /*      Get the segment containing this address
  31 **
  32 **      Written by Kiem-Phong Vo, kpv@research.att.com, 02/07/95
  33 */
  34
  35 #if __STD_C
  36 Void_t* vmsegment(Vmalloc_t* vm, Void_t* addr)
  37 #else
  38 Void_t* vmsegment(vm, addr)
  39 Vmalloc_t*      vm;     /* region       */
  40 Void_t*         addr;   /* address      */
  41 #endif
  42 {
  43         reg Seg_t*      seg;
  44         reg Vmdata_t*   vd = vm->data;
  45         reg int         inuse;
  46
  47         SETINUSE(vd, inuse);
  48         if(!(vd->mode&VM_TRUST))
  49         {       if(ISLOCK(vd,0))
  50                 {       CLRINUSE(vd, inuse);
  51                         return NIL(Void_t*);
  52                 }
  53                 SETLOCK(vd,0);
  54         }
  55
  56         for(seg = vd->seg; seg; seg = seg->next)
  57                 if((Vmuchar_t*)addr >= (Vmuchar_t*)seg->addr &&
  58                    (Vmuchar_t*)addr <  (Vmuchar_t*)seg->baddr )
  59                         break;
  60
  61         CLRLOCK(vd,0);
  62         CLRINUSE(vd, inuse);
  63         return seg ? (Void_t*)seg->addr : NIL(Void_t*);
  64 }
  65
  66 #endif