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/* $Id: mmaptest.c,v 1.3 2003/09/02 23:52:17 david Exp $ */
/*
* Copyright (c) 2001 Niklas Hallqvist. All rights reserverd.
*
* 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.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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/types.h>
#include <sys/mman.h>
#include <err.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#define TEMPL "test-fileXXXXXXXXXX"
#define MAGIC 0x1234
int
main(int argc, char **argv)
{
int fd;
void *v;
int i;
ssize_t n;
static char nm[] = TEMPL;
off_t sz;
fd = mkstemp(nm);
if (fd == -1)
err(1, "mkstemp");
sz = sysconf(_SC_PAGESIZE);
if (sz == -1)
err(1, "sysconf");
if (ftruncate(fd, sz) == -1)
err (1, "ftruncate");
v = mmap(0, sz, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
if (v == MAP_FAILED)
err(1, "mmap");
*(int *)v = MAGIC;
if (msync(v, sz, MS_SYNC) == -1)
err(1, "msync");
if (munmap(v, sz) == -1)
err(1, "munmap");
if (close(fd) == -1)
err(1, "close");
fd = open(nm, O_RDONLY);
if (fd == -1)
err(1, "open");
if (unlink(nm) == -1)
err(1, "unlink");
n = read(fd, &i, sizeof i);
if (n == -1)
err(1, "read");
if (n != sizeof i)
errx(1, "short read");
if (close(fd) == -1)
err(1, "close");
exit(i != MAGIC);
}
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