122 lines
3.0 KiB
C
122 lines
3.0 KiB
C
/* $NetBSD: mem.c,v 1.6 2003/10/22 16:10:03 christos Exp $ */
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/*
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* Copyright (c) 1994, 1995 Jochen Pohl
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* All Rights Reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Jochen Pohl for
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* The NetBSD Project.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#if defined(__RCSID) && !defined(lint)
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__RCSID("$NetBSD: mem.c,v 1.6 2003/10/22 16:10:03 christos Exp $");
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#endif
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#include <sys/param.h>
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#include <sys/types.h>
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#include <sys/mman.h>
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#include <stdlib.h>
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#include <string.h>
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#include "lint.h"
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void *
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xmalloc(size_t s)
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{
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void *p;
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if ((p = malloc(s)) == NULL)
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nomem();
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return (p);
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}
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void *
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xcalloc(size_t n, size_t s)
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{
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void *p;
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if ((p = calloc(n, s)) == NULL)
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nomem();
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return (p);
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}
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void *
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xrealloc(void *p, size_t s)
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{
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void *n;
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if ((n = realloc(p, s)) == NULL) {
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free(p);
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nomem();
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}
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p = n;
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return (p);
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}
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char *
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xstrdup(const char *s)
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{
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char *s2;
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if ((s2 = strdup(s)) == NULL)
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nomem();
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return (s2);
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}
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void
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nomem(void)
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{
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errx(1, "virtual memory exhausted");
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}
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#if defined(MAP_ANONYMOUS) && !defined(MAP_ANON)
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#define MAP_ANON MAP_ANONYMOUS
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#endif
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void *
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xmapalloc(size_t len)
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{
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static const int prot = PROT_READ | PROT_WRITE;
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static int fd = -1;
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void *p;
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#ifdef MAP_ANON
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static const int flags = MAP_ANON | MAP_PRIVATE;
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#else
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static const int flags = MAP_PRIVATE;
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if (fd == -1) {
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if ((fd = open("/dev/zero", O_RDWR)) == -1)
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err(1, "Cannot open `/dev/zero'");
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}
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#endif
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p = mmap(NULL, len, prot, flags, fd, (off_t)0);
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if (p == (void *)-1)
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err(1, "Cannot map memory for %lu bytes", (unsigned long)len);
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return p;
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}
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