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#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 1.6 2003/10/22 16:10:03 christos 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
51void *
52xmalloc(size_t s)
53{
54	void	*p;
55
56	if ((p = malloc(s)) == NULL)
57		nomem();
58	return (p);
59}
60
61void *
62xcalloc(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
71void *
72xrealloc(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
84char *
85xstrdup(const char *s)
86{
87	char	*s2;
88
89	if ((s2 = strdup(s)) == NULL)
90		nomem();
91	return (s2);
92}
93
94void
95nomem(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
105void *
106xmapalloc(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