1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright 1986 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #pragma ident "%Z%%M% %I% %E% SMI" 28 29 #include "mallint.h" 30 #include <errno.h> 31 32 /* 33 * mallopt -- System V-compatible malloc "optimizer" 34 */ 35 int 36 mallopt(int cmd, int value) 37 { 38 if (__mallinfo.smblks != 0) 39 return (-1); /* small block has been allocated */ 40 41 switch (cmd) { 42 case M_MXFAST: /* small block size */ 43 if (value < 0) 44 return (-1); 45 __mallinfo.mxfast = value; 46 break; 47 48 case M_NLBLKS: /* # small blocks per holding block */ 49 if (value <= 0) 50 return (-1); 51 __mallinfo.nlblks = value; 52 break; 53 54 case M_GRAIN: /* small block rounding factor */ 55 if (value <= 0) 56 return (-1); 57 /* round up to multiple of minimum alignment */ 58 __mallinfo.grain = roundup(value, ALIGNSIZ); 59 break; 60 61 case M_KEEP: /* Sun algorithm always preserves data */ 62 break; 63 64 default: 65 return (-1); 66 } 67 68 /* make sure that everything is consistent */ 69 __mallinfo.mxfast = roundup(__mallinfo.mxfast, __mallinfo.grain); 70 71 return (0); 72 } 73 74 75 /* 76 * mallinfo -- System V-compatible malloc information reporter 77 */ 78 struct mallinfo 79 mallinfo(void) 80 { 81 struct mallinfo mi; 82 83 mi = __mallinfo; 84 mi.uordblks = mi.uordbytes - (mi.allocated * sizeof(uint)); 85 mi.fordblks = mi.arena - (mi.treeoverhead + mi.uordblks + 86 (mi.ordblks * sizeof(uint))); 87 return (mi); 88 } 89