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64 lines
2.0 KiB
C
64 lines
2.0 KiB
C
/* Test mremap with MREMAP_DONTUNMAP.
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Copyright (C) 2024-2025 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library 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 GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <sys/mman.h>
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#include <support/xstdlib.h>
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#include <support/xunistd.h>
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#include <support/check.h>
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#include <support/test-driver.h>
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#include <mremap-failure.h>
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static int
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do_test (void)
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{
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size_t old_size = getpagesize ();
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size_t new_size = old_size;
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char *old_addr = xmmap (NULL, old_size, PROT_READ | PROT_WRITE,
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MAP_PRIVATE | MAP_ANONYMOUS, -1);
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old_addr[0] = 1;
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old_addr[old_size - 1] = 2;
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/* Create an available 64-page mmap region. */
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size_t fixed_size = old_size * 64;
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char *fixed_addr = xmmap (NULL, fixed_size, PROT_READ | PROT_WRITE,
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MAP_PRIVATE | MAP_ANONYMOUS, -1);
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xmunmap (fixed_addr, fixed_size);
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/* Add 3 * pagesize. */
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fixed_size += 3 * old_size;
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/* Test MREMAP_DONTUNMAP. It should return FIXED_ADDR created above. */
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char *new_addr = mremap (old_addr, old_size, new_size,
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MREMAP_DONTUNMAP | MREMAP_MAYMOVE,
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fixed_addr);
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if (new_addr == MAP_FAILED)
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return mremap_failure_exit (errno);
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TEST_VERIFY_EXIT (fixed_addr == new_addr);
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old_addr[0] = 3;
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old_addr[old_size - 1] = 4;
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new_addr[0] = 1;
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new_addr[new_size - 1] = 2;
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xmunmap (new_addr, new_size);
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xmunmap (old_addr, old_size);
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return 0;
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}
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#include <support/test-driver.c>
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