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/* Copyright (C) 1989, 1990, 1991, 1992 Free Software Foundation, Inc.
Written by James Clark (jjc@jclark.com)
This file is part of groff.
groff is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 2, or (at your option) any later
version.
groff is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License along
with groff; see the file COPYING. If not, write to the Free Software
Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
#ifdef HAVE_MMAP
#include <sys/types.h>
#include <sys/mman.h>
#include <stdlib.h>
/* The Net-2 man pages says that a MAP_FILE flag is required. */
#ifndef MAP_FILE
#define MAP_FILE 0
#endif
char *mapread(fd, nbytes)
int fd;
int nbytes;
{
char *p = (char *)mmap((caddr_t)0, (size_t)nbytes, PROT_READ,
MAP_FILE|MAP_PRIVATE, fd, (off_t)0);
if (p == (char *)-1)
return 0;
/* mmap() shouldn't return 0 since MAP_FIXED wasn't specified. */
if (p == 0)
abort();
return p;
}
int unmap(p, len)
char *p;
int len;
{
return munmap((caddr_t)p, len);
}
#else /* not HAVE_MMAP */
#include <errno.h>
#ifndef errno
extern int errno;
#endif
char *mapread(fd, nbytes)
int fd;
int nbytes;
{
errno = ENODEV;
return 0;
}
int unmap(p, len)
char *p;
int len;
{
errno = EINVAL;
return -1;
}
#endif /* not HAVE_MMAP */
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