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/* Copyright (C) 1989- 2014 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 3 of the License, 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 this program. If not, see <http://www.gnu.org/licenses/>. */
#include <config.h>
#include <stdlib.h>
#ifdef HAVE_MMAP
#include <sys/types.h>
#include <sys/mman.h>
/* The Net-2 man pages says that a MAP_FILE flag is required. */
#ifndef MAP_FILE
#define MAP_FILE 0
#endif
#ifdef __cplusplus
extern "C" {
#endif
/* Prototypes */
char *mapread(int, int);
int unmap(char *, int);
char *mapread(int fd, int nbytes)
{
char *p = (char *)mmap((void *)0, (size_t)nbytes, PROT_READ,
MAP_FILE|MAP_PRIVATE, fd, (off_t)0);
if (p == MAP_FAILED)
return 0;
/* mmap() shouldn't return 0 since MAP_FIXED wasn't specified. */
if (p == 0)
abort();
return p;
}
int unmap(char *p, int len)
{
return munmap((void *)p, len);
}
#ifdef __cplusplus
}
#endif
#else /* not HAVE_MMAP */
#include <errno.h>
#ifdef __cplusplus
extern "C" {
#endif
char *mapread(int fd, int nbytes)
{
errno = ENODEV;
return 0;
}
int unmap(char *p, int len)
{
errno = EINVAL;
return -1;
}
#ifdef __cplusplus
}
#endif
#endif /* not HAVE_MMAP */
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