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/*
* Copyright (c) 2011 Artur Grabowski <art@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <sys/mman.h>
#include <err.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
/*
* Test a corner case writing to a file from an mmap region from that file
* should fail.
*/
int
main(int argc, char **argv)
{
char name[20] = "/tmp/fluff.XXXXXX";
char *buf;
size_t ps;
int fd;
ps = getpagesize();
if ((fd = mkstemp(name)) == -1)
err(1, "mkstemp");
if (unlink(name) == -1)
err(1, "unlink");
buf = mmap(NULL, ps, PROT_READ, MAP_FILE|MAP_SHARED, fd, 0);
if (buf == MAP_FAILED)
err(1, "mmap");
if (pwrite(fd, buf, ps, 0) == ps)
errx(1, "write to self succeeded");
if (errno != EFAULT)
err(1, "unexpected errno");
return (0);
}
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