xref: /titanic_44/usr/src/lib/libast/common/vmalloc/vmsegment.c (revision a60349c89adffc0902b2353230891d8e7f2b24d9)
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
67