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/* $NetBSD: cmd_mapper.c,v 1.2 2020/04/01 13:07:32 kamil Exp $ */
/*-
* Copyright (c) 2020 The NetBSD Foundation, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__RCSID("$NetBSD: cmd_mapper.c,v 1.2 2020/04/01 13:07:32 kamil Exp $");
#include <sys/mman.h>
#include <err.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#define _PATH_DEV_MAPPER "/dev/fopsmapper"
int main(int argc, char **argv)
{
int devfd;
char *map = NULL;
if ((devfd = open(_PATH_DEV_MAPPER, O_RDONLY)) == -1)
err(EXIT_FAILURE, "Cannot open %s", _PATH_DEV_MAPPER);
map = (char *)(mmap(0, sysconf(_SC_PAGESIZE), PROT_READ, MAP_SHARED,
devfd, 0));
if (map == MAP_FAILED)
err(EXIT_FAILURE, "Mapping failed");
printf("Message from device: %s\n",map);
if (munmap(map, sysconf(_SC_PAGESIZE)) == -1)
err(EXIT_FAILURE, "Unmap failed");
if (close(devfd) == -1)
err(EXIT_FAILURE, "Cannot close %s", _PATH_DEV_MAPPER);
return EXIT_SUCCESS;
}
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