root / tests / test-mmap.c @ e1ffb0f1
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/*
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* Small test program to verify simulated mmap behaviour.
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*
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* When running qemu-linux-user with the -p flag, you may need to tell
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* this test program about the pagesize because getpagesize() will not reflect
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* the -p choice. Simply pass one argument beeing the pagesize.
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*
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* Copyright (c) 2007 AXIS Communications AB
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* Written by Edgar E. Iglesias.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <stdint.h> |
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#include <string.h> |
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#include <unistd.h> |
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#include <sys/mman.h> |
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#define D(x)
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#define fail_unless(x) \
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do \
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{ \
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if (!(x)) { \
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fprintf (stderr, "FAILED at %s:%d\n", __FILE__, __LINE__); \
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exit (EXIT_FAILURE); \ |
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} \ |
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} while (0); |
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unsigned char *dummybuf; |
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static unsigned int pagesize; |
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static unsigned int pagemask; |
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int test_fd;
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size_t test_fsize; |
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|
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void check_aligned_anonymous_unfixed_mmaps(void) |
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{
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void *p1;
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void *p2;
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void *p3;
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void *p4;
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void *p5;
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uintptr_t p; |
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int i;
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fprintf (stderr, "%s", __func__);
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for (i = 0; i < 0x1fff; i++) |
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{
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size_t len; |
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len = pagesize + (pagesize * i & 7);
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p1 = mmap(NULL, len, PROT_READ,
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MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); |
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p2 = mmap(NULL, len, PROT_READ,
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MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); |
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p3 = mmap(NULL, len, PROT_READ,
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MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); |
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p4 = mmap(NULL, len, PROT_READ,
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MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); |
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p5 = mmap(NULL, len, PROT_READ,
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MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); |
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/* Make sure we get pages aligned with the pagesize. The
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target expects this. */
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fail_unless (p1 != MAP_FAILED); |
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fail_unless (p2 != MAP_FAILED); |
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fail_unless (p3 != MAP_FAILED); |
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fail_unless (p4 != MAP_FAILED); |
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fail_unless (p5 != MAP_FAILED); |
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p = (uintptr_t) p1; |
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D(printf ("p=%x\n", p));
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fail_unless ((p & pagemask) == 0);
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p = (uintptr_t) p2; |
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fail_unless ((p & pagemask) == 0);
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p = (uintptr_t) p3; |
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fail_unless ((p & pagemask) == 0);
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p = (uintptr_t) p4; |
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fail_unless ((p & pagemask) == 0);
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p = (uintptr_t) p5; |
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fail_unless ((p & pagemask) == 0);
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/* Make sure we can read from the entire area. */
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memcpy (dummybuf, p1, pagesize); |
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memcpy (dummybuf, p2, pagesize); |
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memcpy (dummybuf, p3, pagesize); |
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memcpy (dummybuf, p4, pagesize); |
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memcpy (dummybuf, p5, pagesize); |
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munmap (p1, len); |
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munmap (p2, len); |
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munmap (p3, len); |
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munmap (p4, len); |
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munmap (p5, len); |
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} |
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fprintf (stderr, " passed\n");
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} |
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void check_large_anonymous_unfixed_mmap(void) |
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{
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void *p1;
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uintptr_t p; |
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size_t len; |
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fprintf (stderr, "%s", __func__);
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len = 0x02000000;
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p1 = mmap(NULL, len, PROT_READ,
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MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); |
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/* Make sure we get pages aligned with the pagesize. The
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target expects this. */
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fail_unless (p1 != MAP_FAILED); |
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p = (uintptr_t) p1; |
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fail_unless ((p & pagemask) == 0);
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/* Make sure we can read from the entire area. */
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memcpy (dummybuf, p1, pagesize); |
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munmap (p1, len); |
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fprintf (stderr, " passed\n");
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} |
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void check_aligned_anonymous_unfixed_colliding_mmaps(void) |
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{
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char *p1;
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char *p2;
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char *p3;
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uintptr_t p; |
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int i;
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fprintf (stderr, "%s", __func__);
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for (i = 0; i < 0x2fff; i++) |
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{
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int nlen;
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p1 = mmap(NULL, pagesize, PROT_READ,
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MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); |
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fail_unless (p1 != MAP_FAILED); |
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p = (uintptr_t) p1; |
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fail_unless ((p & pagemask) == 0);
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memcpy (dummybuf, p1, pagesize); |
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p2 = mmap(NULL, pagesize, PROT_READ,
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MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); |
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fail_unless (p2 != MAP_FAILED); |
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p = (uintptr_t) p2; |
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fail_unless ((p & pagemask) == 0);
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memcpy (dummybuf, p2, pagesize); |
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munmap (p1, pagesize); |
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nlen = pagesize * 8;
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p3 = mmap(NULL, nlen, PROT_READ,
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MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); |
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/* Check if the mmaped areas collide. */
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if (p3 < p2
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&& (p3 + nlen) > p2) |
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fail_unless (0);
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memcpy (dummybuf, p3, pagesize); |
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/* Make sure we get pages aligned with the pagesize. The
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target expects this. */
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fail_unless (p3 != MAP_FAILED); |
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p = (uintptr_t) p3; |
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fail_unless ((p & pagemask) == 0);
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munmap (p2, pagesize); |
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munmap (p3, nlen); |
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} |
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fprintf (stderr, " passed\n");
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} |
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void check_aligned_anonymous_fixed_mmaps(void) |
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{
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char *addr;
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void *p1;
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uintptr_t p; |
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int i;
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/* Find a suitable address to start with. */
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addr = mmap(NULL, pagesize * 40, PROT_READ | PROT_WRITE, |
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MAP_PRIVATE | MAP_ANONYMOUS, |
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-1, 0); |
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fprintf (stderr, "%s addr=%p", __func__, addr);
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fail_unless (addr != MAP_FAILED); |
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for (i = 0; i < 40; i++) |
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{
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/* Create submaps within our unfixed map. */
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p1 = mmap(addr, pagesize, PROT_READ, |
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MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED, |
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-1, 0); |
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/* Make sure we get pages aligned with the pagesize.
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The target expects this. */
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p = (uintptr_t) p1; |
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fail_unless (p1 == addr); |
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fail_unless ((p & pagemask) == 0);
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memcpy (dummybuf, p1, pagesize); |
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munmap (p1, pagesize); |
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addr += pagesize; |
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} |
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fprintf (stderr, " passed\n");
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} |
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void check_aligned_anonymous_fixed_mmaps_collide_with_host(void) |
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{
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char *addr;
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void *p1;
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uintptr_t p; |
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int i;
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/* Find a suitable address to start with. Right were the x86 hosts
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stack is. */
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addr = ((void *)0x80000000); |
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fprintf (stderr, "%s addr=%p", __func__, addr);
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fprintf (stderr, "FIXME: QEMU fails to track pages used by the host.");
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for (i = 0; i < 20; i++) |
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{
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/* Create submaps within our unfixed map. */
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p1 = mmap(addr, pagesize, PROT_READ | PROT_WRITE, |
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MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED, |
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-1, 0); |
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/* Make sure we get pages aligned with the pagesize.
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The target expects this. */
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p = (uintptr_t) p1; |
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fail_unless (p1 == addr); |
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fail_unless ((p & pagemask) == 0);
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memcpy (p1, dummybuf, pagesize); |
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munmap (p1, pagesize); |
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addr += pagesize; |
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} |
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fprintf (stderr, " passed\n");
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} |
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void check_file_unfixed_mmaps(void) |
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{
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unsigned int *p1, *p2, *p3; |
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uintptr_t p; |
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int i;
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fprintf (stderr, "%s", __func__);
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for (i = 0; i < 0x10; i++) |
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{
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size_t len; |
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len = pagesize; |
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p1 = mmap(NULL, len, PROT_READ,
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MAP_PRIVATE, |
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test_fd, 0);
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p2 = mmap(NULL, len, PROT_READ,
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MAP_PRIVATE, |
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test_fd, pagesize); |
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p3 = mmap(NULL, len, PROT_READ,
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MAP_PRIVATE, |
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test_fd, pagesize * 2);
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fail_unless (p1 != MAP_FAILED); |
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fail_unless (p2 != MAP_FAILED); |
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fail_unless (p3 != MAP_FAILED); |
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/* Make sure we get pages aligned with the pagesize. The
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target expects this. */
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p = (uintptr_t) p1; |
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fail_unless ((p & pagemask) == 0);
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p = (uintptr_t) p2; |
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fail_unless ((p & pagemask) == 0);
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p = (uintptr_t) p3; |
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fail_unless ((p & pagemask) == 0);
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/* Verify that the file maps was made correctly. */
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D(printf ("p1=%d p2=%d p3=%d\n", *p1, *p2, *p3));
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fail_unless (*p1 == 0);
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fail_unless (*p2 == (pagesize / sizeof *p2));
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fail_unless (*p3 == ((pagesize * 2) / sizeof *p3)); |
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memcpy (dummybuf, p1, pagesize); |
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memcpy (dummybuf, p2, pagesize); |
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memcpy (dummybuf, p3, pagesize); |
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munmap (p1, len); |
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munmap (p2, len); |
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munmap (p3, len); |
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} |
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fprintf (stderr, " passed\n");
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} |
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|
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void check_file_unfixed_eof_mmaps(void) |
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{
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char *cp;
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unsigned int *p1; |
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uintptr_t p; |
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int i;
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fprintf (stderr, "%s", __func__);
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for (i = 0; i < 0x10; i++) |
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{
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p1 = mmap(NULL, pagesize, PROT_READ,
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MAP_PRIVATE, |
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test_fd, |
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(test_fsize - sizeof *p1) & ~pagemask);
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fail_unless (p1 != MAP_FAILED); |
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/* Make sure we get pages aligned with the pagesize. The
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target expects this. */
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p = (uintptr_t) p1; |
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fail_unless ((p & pagemask) == 0);
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/* Verify that the file maps was made correctly. */
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fail_unless (p1[(test_fsize & pagemask) / sizeof *p1 - 1] |
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== ((test_fsize - sizeof *p1) / sizeof *p1)); |
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/* Verify that the end of page is accessable and zeroed. */
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cp = (void *) p1;
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fail_unless (cp[pagesize - 4] == 0); |
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munmap (p1, pagesize); |
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} |
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fprintf (stderr, " passed\n");
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} |
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|
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void check_file_fixed_eof_mmaps(void) |
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{
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char *addr;
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char *cp;
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unsigned int *p1; |
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uintptr_t p; |
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int i;
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/* Find a suitable address to start with. */
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addr = mmap(NULL, pagesize * 44, PROT_READ, |
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MAP_PRIVATE | MAP_ANONYMOUS, |
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-1, 0); |
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|
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fprintf (stderr, "%s addr=%p", __func__, (void *)addr); |
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fail_unless (addr != MAP_FAILED); |
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|
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for (i = 0; i < 0x10; i++) |
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{
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/* Create submaps within our unfixed map. */
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p1 = mmap(addr, pagesize, PROT_READ, |
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MAP_PRIVATE | MAP_FIXED, |
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test_fd, |
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(test_fsize - sizeof *p1) & ~pagemask);
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|
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fail_unless (p1 != MAP_FAILED); |
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|
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/* Make sure we get pages aligned with the pagesize. The
|
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target expects this. */
|
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p = (uintptr_t) p1; |
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fail_unless ((p & pagemask) == 0);
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|
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/* Verify that the file maps was made correctly. */
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fail_unless (p1[(test_fsize & pagemask) / sizeof *p1 - 1] |
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== ((test_fsize - sizeof *p1) / sizeof *p1)); |
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|
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/* Verify that the end of page is accessable and zeroed. */
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cp = (void *)p1;
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fail_unless (cp[pagesize - 4] == 0); |
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munmap (p1, pagesize); |
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addr += pagesize; |
| 374 |
} |
| 375 |
fprintf (stderr, " passed\n");
|
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} |
| 377 |
|
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void check_file_fixed_mmaps(void) |
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{
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unsigned int *addr; |
| 381 |
unsigned int *p1, *p2, *p3, *p4; |
| 382 |
int i;
|
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|
| 384 |
/* Find a suitable address to start with. */
|
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addr = mmap(NULL, pagesize * 44 * 3, PROT_READ, |
| 386 |
MAP_PRIVATE | MAP_ANONYMOUS, |
| 387 |
-1, 0); |
| 388 |
fprintf (stderr, "%s addr=%p", __func__, (void *)addr); |
| 389 |
fail_unless (addr != MAP_FAILED); |
| 390 |
|
| 391 |
for (i = 0; i < 40; i++) |
| 392 |
{
|
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p1 = mmap(addr, pagesize, PROT_READ, |
| 394 |
MAP_PRIVATE | MAP_FIXED, |
| 395 |
test_fd, 0);
|
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p2 = mmap(addr + pagesize, pagesize, PROT_READ, |
| 397 |
MAP_PRIVATE | MAP_FIXED, |
| 398 |
test_fd, pagesize); |
| 399 |
p3 = mmap(addr + pagesize * 2, pagesize, PROT_READ,
|
| 400 |
MAP_PRIVATE | MAP_FIXED, |
| 401 |
test_fd, pagesize * 2);
|
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p4 = mmap(addr + pagesize * 3, pagesize, PROT_READ,
|
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MAP_PRIVATE | MAP_FIXED, |
| 404 |
test_fd, pagesize * 3);
|
| 405 |
|
| 406 |
/* Make sure we get pages aligned with the pagesize.
|
| 407 |
The target expects this. */
|
| 408 |
fail_unless (p1 == addr); |
| 409 |
fail_unless (p2 == addr + pagesize); |
| 410 |
fail_unless (p3 == addr + pagesize * 2);
|
| 411 |
fail_unless (p4 == addr + pagesize * 3);
|
| 412 |
|
| 413 |
/* Verify that the file maps was made correctly. */
|
| 414 |
fail_unless (*p1 == 0);
|
| 415 |
fail_unless (*p2 == (pagesize / sizeof *p2));
|
| 416 |
fail_unless (*p3 == ((pagesize * 2) / sizeof *p3)); |
| 417 |
fail_unless (*p4 == ((pagesize * 3) / sizeof *p4)); |
| 418 |
|
| 419 |
memcpy (dummybuf, p1, pagesize); |
| 420 |
memcpy (dummybuf, p2, pagesize); |
| 421 |
memcpy (dummybuf, p3, pagesize); |
| 422 |
memcpy (dummybuf, p4, pagesize); |
| 423 |
|
| 424 |
munmap (p1, pagesize); |
| 425 |
munmap (p2, pagesize); |
| 426 |
munmap (p3, pagesize); |
| 427 |
munmap (p4, pagesize); |
| 428 |
addr += pagesize * 3;
|
| 429 |
} |
| 430 |
fprintf (stderr, " passed\n");
|
| 431 |
} |
| 432 |
|
| 433 |
int main(int argc, char **argv) |
| 434 |
{
|
| 435 |
char tempname[] = "/tmp/.cmmapXXXXXX"; |
| 436 |
unsigned int i; |
| 437 |
|
| 438 |
/* Trust the first argument, otherwise probe the system for our
|
| 439 |
pagesize. */
|
| 440 |
if (argc > 1) |
| 441 |
pagesize = strtoul(argv[1], NULL, 0); |
| 442 |
else
|
| 443 |
pagesize = sysconf(_SC_PAGESIZE); |
| 444 |
|
| 445 |
/* Assume pagesize is a power of two. */
|
| 446 |
pagemask = pagesize - 1;
|
| 447 |
dummybuf = malloc (pagesize); |
| 448 |
printf ("pagesize=%u pagemask=%x\n", pagesize, pagemask);
|
| 449 |
|
| 450 |
test_fd = mkstemp(tempname); |
| 451 |
unlink(tempname); |
| 452 |
|
| 453 |
/* Fill the file with int's counting from zero and up. */
|
| 454 |
for (i = 0; i < (pagesize * 4) / sizeof i; i++) |
| 455 |
write (test_fd, &i, sizeof i);
|
| 456 |
/* Append a few extra writes to make the file end at non
|
| 457 |
page boundary. */
|
| 458 |
write (test_fd, &i, sizeof i); i++;
|
| 459 |
write (test_fd, &i, sizeof i); i++;
|
| 460 |
write (test_fd, &i, sizeof i); i++;
|
| 461 |
|
| 462 |
test_fsize = lseek(test_fd, 0, SEEK_CUR);
|
| 463 |
|
| 464 |
/* Run the tests. */
|
| 465 |
check_aligned_anonymous_unfixed_mmaps(); |
| 466 |
check_aligned_anonymous_unfixed_colliding_mmaps(); |
| 467 |
check_aligned_anonymous_fixed_mmaps(); |
| 468 |
check_file_unfixed_mmaps(); |
| 469 |
check_file_fixed_mmaps(); |
| 470 |
check_file_fixed_eof_mmaps(); |
| 471 |
check_file_unfixed_eof_mmaps(); |
| 472 |
|
| 473 |
/* Fails at the moment. */
|
| 474 |
/* check_aligned_anonymous_fixed_mmaps_collide_with_host(); */
|
| 475 |
|
| 476 |
return EXIT_SUCCESS;
|
| 477 |
} |