1/*	$NetBSD$	*/
2
3/* Copyright (C) 1989, 1990, 1991, 1992, 2000, 2001, 2004
4   Free Software Foundation, Inc.
5     Written by James Clark (jjc@jclark.com)
6
7This file is part of groff.
8
9groff is free software; you can redistribute it and/or modify it under
10the terms of the GNU General Public License as published by the Free
11Software Foundation; either version 2, or (at your option) any later
12version.
13
14groff is distributed in the hope that it will be useful, but WITHOUT ANY
15WARRANTY; without even the implied warranty of MERCHANTABILITY or
16FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
17for more details.
18
19You should have received a copy of the GNU General Public License along
20with groff; see the file COPYING.  If not, write to the Free Software
21Foundation, 51 Franklin St - Fifth Floor, Boston, MA 02110-1301, USA. */
22
23#include <stdlib.h>
24
25#ifdef HAVE_CONFIG_H
26#include <config.h>
27#endif
28
29#ifdef HAVE_MMAP
30
31#include <sys/types.h>
32#include <sys/mman.h>
33
34/* The Net-2 man pages says that a MAP_FILE flag is required. */
35#ifndef MAP_FILE
36#define MAP_FILE 0
37#endif
38
39#ifdef __cplusplus
40extern "C" {
41#endif
42
43char *mapread(int fd, int nbytes)
44{
45  char *p = (char *)mmap((void *)0, (size_t)nbytes, PROT_READ,
46			 MAP_FILE|MAP_PRIVATE, fd, (off_t)0);
47  if (p == (char *)-1)
48    return 0;
49  /* mmap() shouldn't return 0 since MAP_FIXED wasn't specified. */
50  if (p == 0)
51    abort();
52  return p;
53}
54
55int unmap(char *p, int len)
56{
57  return munmap((void *)p, len);
58}
59
60#ifdef __cplusplus
61}
62#endif
63
64#else /* not HAVE_MMAP */
65
66#include <errno.h>
67
68#ifdef __cplusplus
69extern "C" {
70#endif
71
72char *mapread(int fd, int nbytes)
73{
74  errno = ENODEV;
75  return 0;
76}
77
78int unmap(char *p, int len)
79{
80  errno = EINVAL;
81  return -1;
82}
83
84#ifdef __cplusplus
85}
86#endif
87
88#endif /* not HAVE_MMAP */
89