vmsegment.c revision 3e14f97f673e8a630f076077de35afdd43dc1587
/***********************************************************************
* *
* This software is part of the ast package *
* Copyright (c) 1985-2010 AT&T Intellectual Property *
* and is licensed under the *
* Common Public License, Version 1.0 *
* by AT&T Intellectual Property *
* *
* A copy of the License is available at *
* http://www.opensource.org/licenses/cpl1.0.txt *
* (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) *
* *
* Information and Software Systems Research *
* AT&T Research *
* Florham Park NJ *
* *
* Glenn Fowler <gsf@research.att.com> *
* David Korn <dgk@research.att.com> *
* Phong Vo <kpv@research.att.com> *
* *
***********************************************************************/
#if defined(_UWIN) && defined(_BLD_ast)
void _STUB_vmsegment(){}
#else
#include "vmhdr.h"
/* Get the segment containing this address
**
** Written by Kiem-Phong Vo, kpv@research.att.com, 02/07/95
*/
#if __STD_C
Void_t* vmsegment(Vmalloc_t* vm, Void_t* addr)
#else
Void_t* vmsegment(vm, addr)
Vmalloc_t* vm; /* region */
Void_t* addr; /* address */
#endif
{
reg Seg_t* seg;
reg Vmdata_t* vd = vm->data;
reg int inuse;
SETINUSE(vd, inuse);
if(!(vd->mode&VM_TRUST))
{ if(ISLOCK(vd,0))
{ CLRINUSE(vd, inuse);
return NIL(Void_t*);
}
SETLOCK(vd,0);
}
for(seg = vd->seg; seg; seg = seg->next)
if((Vmuchar_t*)addr >= (Vmuchar_t*)seg->addr &&
(Vmuchar_t*)addr < (Vmuchar_t*)seg->baddr )
break;
CLRLOCK(vd,0);
CLRINUSE(vd, inuse);
return seg ? (Void_t*)seg->addr : NIL(Void_t*);
}
#endif