1*212c9b3bSriastradh /* $NetBSD: cmd_mapper.c,v 1.3 2024/04/17 18:10:27 riastradh Exp $ */
22c306a0eSkamil
32c306a0eSkamil /*-
42c306a0eSkamil * Copyright (c) 2020 The NetBSD Foundation, Inc.
52c306a0eSkamil * All rights reserved.
62c306a0eSkamil *
72c306a0eSkamil * Redistribution and use in source and binary forms, with or without
82c306a0eSkamil * modification, are permitted provided that the following conditions
92c306a0eSkamil * are met:
102c306a0eSkamil * 1. Redistributions of source code must retain the above copyright
112c306a0eSkamil * notice, this list of conditions and the following disclaimer.
122c306a0eSkamil * 2. Redistributions in binary form must reproduce the above copyright
132c306a0eSkamil * notice, this list of conditions and the following disclaimer in the
142c306a0eSkamil * documentation and/or other materials provided with the distribution.
152c306a0eSkamil *
162c306a0eSkamil * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
172c306a0eSkamil * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
182c306a0eSkamil * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
192c306a0eSkamil * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
202c306a0eSkamil * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
212c306a0eSkamil * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
222c306a0eSkamil * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
232c306a0eSkamil * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
242c306a0eSkamil * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
252c306a0eSkamil * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
262c306a0eSkamil * POSSIBILITY OF SUCH DAMAGE.
272c306a0eSkamil */
282c306a0eSkamil
292c306a0eSkamil #include <sys/cdefs.h>
30*212c9b3bSriastradh __RCSID("$NetBSD: cmd_mapper.c,v 1.3 2024/04/17 18:10:27 riastradh Exp $");
312c306a0eSkamil
322c306a0eSkamil #include <sys/mman.h>
332c306a0eSkamil
342c306a0eSkamil #include <err.h>
352c306a0eSkamil #include <fcntl.h>
362c306a0eSkamil #include <stdio.h>
372c306a0eSkamil #include <stdlib.h>
382c306a0eSkamil #include <unistd.h>
392c306a0eSkamil
402c306a0eSkamil #define _PATH_DEV_MAPPER "/dev/fopsmapper"
412c306a0eSkamil
main(int argc,char ** argv)422c306a0eSkamil int main(int argc, char **argv)
432c306a0eSkamil {
442c306a0eSkamil int devfd;
452c306a0eSkamil char *map = NULL;
462c306a0eSkamil
472c306a0eSkamil if ((devfd = open(_PATH_DEV_MAPPER, O_RDONLY)) == -1)
482c306a0eSkamil err(EXIT_FAILURE, "Cannot open %s", _PATH_DEV_MAPPER);
492c306a0eSkamil
50*212c9b3bSriastradh map = mmap(0, sysconf(_SC_PAGESIZE), PROT_READ, MAP_SHARED, devfd, 0);
512c306a0eSkamil if (map == MAP_FAILED)
522c306a0eSkamil err(EXIT_FAILURE, "Mapping failed");
532c306a0eSkamil
542c306a0eSkamil printf("Message from device: %s\n", map);
552c306a0eSkamil
562c306a0eSkamil if (munmap(map, sysconf(_SC_PAGESIZE)) == -1)
572c306a0eSkamil err(EXIT_FAILURE, "Unmap failed");
582c306a0eSkamil
592c306a0eSkamil if (close(devfd) == -1)
602c306a0eSkamil err(EXIT_FAILURE, "Cannot close %s", _PATH_DEV_MAPPER);
612c306a0eSkamil
622c306a0eSkamil return EXIT_SUCCESS;
632c306a0eSkamil }
64