| mem2.c (75831) | mem2.c (91592) |
|---|---|
| 1/* $NetBSD: mem2.c,v 1.3 1995/10/02 17:27:11 jpo Exp $ */ | 1/* $NetBSD: mem2.c,v 1.6 2002/01/21 19:49:52 tv Exp $ */ |
| 2 3/* 4 * Copyright (c) 1994, 1995 Jochen Pohl 5 * All Rights Reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: --- 16 unchanged lines hidden (view full) --- 26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 27 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 31 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 */ 33 | 2 3/* 4 * Copyright (c) 1994, 1995 Jochen Pohl 5 * All Rights Reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: --- 16 unchanged lines hidden (view full) --- 26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 27 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 31 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 */ 33 |
| 34#ifndef lint 35static const char rcsid[] = 36 "$FreeBSD: head/usr.bin/xlint/lint2/mem2.c 75831 2001-04-22 17:06:12Z asmodai $"; | 34#include <sys/cdefs.h> 35#if defined(__RCSID) && !defined(lint) 36__RCSID("$NetBSD: mem2.c,v 1.6 2002/01/21 19:49:52 tv Exp $"); |
| 37#endif | 37#endif |
| 38__FBSDID("$FreeBSD: head/usr.bin/xlint/lint2/mem2.c 91592 2002-03-03 15:12:50Z markm $"); |
|
| 38 39#include <sys/param.h> 40#include <sys/types.h> 41#include <sys/mman.h> 42#include <unistd.h> 43#include <string.h> | 39 40#include <sys/param.h> 41#include <sys/types.h> 42#include <sys/mman.h> 43#include <unistd.h> 44#include <string.h> |
| 44#include <err.h> | |
| 45 46#include "lint2.h" 47 48/* length of new allocated memory blocks */ 49static size_t mblklen; 50 51/* offset of next free byte in mbuf */ 52static size_t nxtfree; 53 54/* current buffer to server memory requests from */ 55static void *mbuf; 56 57void | 45 46#include "lint2.h" 47 48/* length of new allocated memory blocks */ 49static size_t mblklen; 50 51/* offset of next free byte in mbuf */ 52static size_t nxtfree; 53 54/* current buffer to server memory requests from */ 55static void *mbuf; 56 57void |
| 58initmem() | 58initmem(void) |
| 59{ 60 int pgsz; 61 62 pgsz = getpagesize(); 63 mblklen = ((MBLKSIZ + pgsz - 1) / pgsz) * pgsz; 64 65 nxtfree = mblklen; 66} 67 68/* 69 * Allocate memory in large chunks to avoid space and time overhead of 70 * malloc(). This is possible because memory allocated by xalloc() 71 * need never to be freed. 72 */ 73void * | 59{ 60 int pgsz; 61 62 pgsz = getpagesize(); 63 mblklen = ((MBLKSIZ + pgsz - 1) / pgsz) * pgsz; 64 65 nxtfree = mblklen; 66} 67 68/* 69 * Allocate memory in large chunks to avoid space and time overhead of 70 * malloc(). This is possible because memory allocated by xalloc() 71 * need never to be freed. 72 */ 73void * |
| 74xalloc(sz) 75 size_t sz; | 74xalloc(size_t sz) |
| 76{ 77 void *ptr; 78 int prot, flags; 79 | 75{ 76 void *ptr; 77 int prot, flags; 78 |
| 80 sz = ALIGN(sz); | 79 /* Align to at least 8 bytes. */ 80 sz = (sz + 7) & ~7L; |
| 81 if (nxtfree + sz > mblklen) { 82 /* use mmap() instead of malloc() to avoid malloc overhead. */ 83 prot = PROT_READ | PROT_WRITE; 84 flags = MAP_ANON | MAP_PRIVATE; 85 mbuf = mmap(NULL, mblklen, prot, flags, -1, (off_t)0); 86 if (mbuf == (void *)MAP_FAILED) 87 err(1, "can't map memory"); | 81 if (nxtfree + sz > mblklen) { 82 /* use mmap() instead of malloc() to avoid malloc overhead. */ 83 prot = PROT_READ | PROT_WRITE; 84 flags = MAP_ANON | MAP_PRIVATE; 85 mbuf = mmap(NULL, mblklen, prot, flags, -1, (off_t)0); 86 if (mbuf == (void *)MAP_FAILED) 87 err(1, "can't map memory"); |
| 88 if (ALIGN((u_long)mbuf) != (u_long)mbuf) 89 errx(1, "mapped address is not aligned"); | |
| 90 (void)memset(mbuf, 0, mblklen); 91 nxtfree = 0; 92 } 93 94 ptr = (char *)mbuf + nxtfree; 95 nxtfree += sz; 96 97 return (ptr); 98} | 88 (void)memset(mbuf, 0, mblklen); 89 nxtfree = 0; 90 } 91 92 ptr = (char *)mbuf + nxtfree; 93 nxtfree += sz; 94 95 return (ptr); 96} |