1 /* $NetBSD: mem.c,v 1.7 2004/06/20 22:20:16 jmc 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: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by Jochen Pohl for 18 * The NetBSD Project. 19 * 4. The name of the author may not be used to endorse or promote products 20 * derived from this software without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 25 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 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 #if HAVE_NBTOOL_CONFIG_H 35 #include "nbtool_config.h" 36 #endif 37 38 #include <sys/cdefs.h> 39 #if defined(__RCSID) && !defined(lint) 40 __RCSID("$NetBSD: mem.c,v 1.7 2004/06/20 22:20:16 jmc Exp $"); 41 #endif 42 43 #include <sys/param.h> 44 #include <sys/types.h> 45 #include <sys/mman.h> 46 #include <stdlib.h> 47 #include <string.h> 48 49 #include "lint.h" 50 51 void * 52 xmalloc(size_t s) 53 { 54 void *p; 55 56 if ((p = malloc(s)) == NULL) 57 nomem(); 58 return (p); 59 } 60 61 void * 62 xcalloc(size_t n, size_t s) 63 { 64 void *p; 65 66 if ((p = calloc(n, s)) == NULL) 67 nomem(); 68 return (p); 69 } 70 71 void * 72 xrealloc(void *p, size_t s) 73 { 74 void *n; 75 76 if ((n = realloc(p, s)) == NULL) { 77 free(p); 78 nomem(); 79 } 80 p = n; 81 return (p); 82 } 83 84 char * 85 xstrdup(const char *s) 86 { 87 char *s2; 88 89 if ((s2 = strdup(s)) == NULL) 90 nomem(); 91 return (s2); 92 } 93 94 void 95 nomem(void) 96 { 97 98 errx(1, "virtual memory exhausted"); 99 } 100 101 #if defined(MAP_ANONYMOUS) && !defined(MAP_ANON) 102 #define MAP_ANON MAP_ANONYMOUS 103 #endif 104 105 void * 106 xmapalloc(size_t len) 107 { 108 static const int prot = PROT_READ | PROT_WRITE; 109 static int fd = -1; 110 void *p; 111 #ifdef MAP_ANON 112 static const int flags = MAP_ANON | MAP_PRIVATE; 113 #else 114 static const int flags = MAP_PRIVATE; 115 116 if (fd == -1) { 117 if ((fd = open("/dev/zero", O_RDWR)) == -1) 118 err(1, "Cannot open `/dev/zero'"); 119 } 120 #endif 121 p = mmap(NULL, len, prot, flags, fd, (off_t)0); 122 if (p == (void *)-1) 123 err(1, "Cannot map memory for %lu bytes", (unsigned long)len); 124 return p; 125 } 126