1 /* $NetBSD: mem.c,v 1.6 2003/10/22 16:10:03 christos 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 #include <sys/cdefs.h> 35 #if defined(__RCSID) && !defined(lint) 36 __RCSID("$NetBSD: mem.c,v 1.6 2003/10/22 16:10:03 christos Exp $"); 37 #endif 38 39 #include <sys/param.h> 40 #include <sys/types.h> 41 #include <sys/mman.h> 42 #include <stdlib.h> 43 #include <string.h> 44 45 #include "lint.h" 46 47 void * 48 xmalloc(size_t s) 49 { 50 void *p; 51 52 if ((p = malloc(s)) == NULL) 53 nomem(); 54 return (p); 55 } 56 57 void * 58 xcalloc(size_t n, size_t s) 59 { 60 void *p; 61 62 if ((p = calloc(n, s)) == NULL) 63 nomem(); 64 return (p); 65 } 66 67 void * 68 xrealloc(void *p, size_t s) 69 { 70 void *n; 71 72 if ((n = realloc(p, s)) == NULL) { 73 free(p); 74 nomem(); 75 } 76 p = n; 77 return (p); 78 } 79 80 char * 81 xstrdup(const char *s) 82 { 83 char *s2; 84 85 if ((s2 = strdup(s)) == NULL) 86 nomem(); 87 return (s2); 88 } 89 90 void 91 nomem(void) 92 { 93 94 errx(1, "virtual memory exhausted"); 95 } 96 97 #if defined(MAP_ANONYMOUS) && !defined(MAP_ANON) 98 #define MAP_ANON MAP_ANONYMOUS 99 #endif 100 101 void * 102 xmapalloc(size_t len) 103 { 104 static const int prot = PROT_READ | PROT_WRITE; 105 static int fd = -1; 106 void *p; 107 #ifdef MAP_ANON 108 static const int flags = MAP_ANON | MAP_PRIVATE; 109 #else 110 static const int flags = MAP_PRIVATE; 111 112 if (fd == -1) { 113 if ((fd = open("/dev/zero", O_RDWR)) == -1) 114 err(1, "Cannot open `/dev/zero'"); 115 } 116 #endif 117 p = mmap(NULL, len, prot, flags, fd, (off_t)0); 118 if (p == (void *)-1) 119 err(1, "Cannot map memory for %lu bytes", (unsigned long)len); 120 return p; 121 } 122