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mem.c revision 1.5 
      1 /*	$NetBSD: mem.c,v 1.5 2003/10/21 23:58:53 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 1.5 2003/10/21 23:58:53 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 void *
     98 xmapalloc(size_t len)
     99 {
    100 	static const int prot = PROT_READ | PROT_WRITE;
    101 	void *p;
    102 #ifdef MAP_ANON
    103 	static const int flags = MAP_ANON | MAP_PRIVATE;
    104 	int fd = -1;
    105 #else
    106 	static const int flags = MAP_PRIVATE;
    107 	int fd = open("/dev/zero", O_RDWR);
    108 
    109 	if (fd == -1)
    110 		err(1, "Cannot open `/dev/zero'");
    111 #endif
    112 	p = mmap(NULL, len, prot, flags, fd, (off_t)0);
    113 	if (p == (void *)-1)
    114 		err(1, "Cannot map memory for %lu bytes", (unsigned long)len);
    115 #ifndef MAP_ANON
    116 	(void)close(fd);
    117 #endif
    118 	return p;
    119 }
    120