68 lines
1.9 KiB
C
68 lines
1.9 KiB
C
/* BZ #18877 mmap offset test.
|
|
|
|
Copyright (C) 2015-2016 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
#include <sys/mman.h>
|
|
|
|
static int
|
|
printmsg (int rc, const char *msg)
|
|
{
|
|
printf ("%s failed: %m\n", msg);
|
|
return rc;
|
|
}
|
|
|
|
/* Check if negative offsets are handled correctly by mmap. */
|
|
static int
|
|
do_test (void)
|
|
{
|
|
const int prot = PROT_READ | PROT_WRITE;
|
|
const int flags = MAP_SHARED;
|
|
const unsigned long length = 0x10000;
|
|
const unsigned long offset = 0xace00000;
|
|
const unsigned long size = offset + length;
|
|
void *addr;
|
|
int fd;
|
|
char fname[] = "tst-mmap-offset-XXXXXX";
|
|
|
|
fd = mkstemp64 (fname);
|
|
if (fd < 0)
|
|
return printmsg (1, "mkstemp");
|
|
|
|
if (unlink (fname))
|
|
return printmsg (1, "unlink");
|
|
|
|
if (ftruncate64 (fd, size))
|
|
return printmsg (0, "ftruncate64");
|
|
|
|
addr = mmap (NULL, length, prot, flags, fd, offset);
|
|
if (MAP_FAILED == addr)
|
|
return printmsg (1, "mmap");
|
|
|
|
/* This memcpy is likely to SIGBUS if mmap has messed up with offset. */
|
|
memcpy (addr, fname, sizeof (fname));
|
|
|
|
return 0;
|
|
}
|
|
|
|
#define TEST_FUNCTION do_test ()
|
|
#include "../test-skeleton.c"
|