Home | History | Annotate | Line # | Download | only in common
mem.c revision 1.7 
      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