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/* $OpenBSD: mmap0.c,v 1.2 2016/08/27 04:35:19 guenther Exp $ */
/*
* Copyright (c) 2011 Ariane van der Steldt <ariane@stack.nl>
*
* 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 <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <sysexits.h>
/*
* Mmap allocations with len=0 must fail with EINVAL.
*
* Posix says so and the vmmap implementation may not deal well with them
* either.
*/
int
main()
{
void *ptr;
int errors = 0;
int fd;
fd = open("/dev/zero", O_RDWR, 0);
if (fd == -1)
err(EX_OSERR, "open");
ptr = mmap(NULL, 0, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANON, -1, 0);
if (ptr != MAP_FAILED) {
warn("mmap(len=0, MAP_ANON) return %p, expected MAP_FAILED",
ptr);
errors += 1;
} else if (errno != EINVAL) {
warn("mmap(len=0, MAP_ANON) errno %d, expected %d",
errno, EINVAL);
}
ptr = mmap(NULL, 0, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0);
if (ptr != MAP_FAILED) {
warn("mmap(len=0, fd=\"/dev/zero\") returned %p, "
"expected MAP_FAILED", ptr);
errors += 1;
} else if (errno != EINVAL) {
warn("mmap(len=0, fd=\"/dev/zero\") errno %d, expected %d",
errno, EINVAL);
}
return errors;
}
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