44 lines
1.0 KiB
C
44 lines
1.0 KiB
C
/*
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* Copyright (c) 2015-2018 Dmitry V. Levin <ldv@altlinux.org>
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* All rights reserved.
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#include "tests.h"
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#include <string.h>
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#include <sys/mman.h>
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void *
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tail_alloc(const size_t size)
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{
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const size_t page_size = get_page_size();
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const size_t len = (size + page_size - 1) & -page_size;
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const size_t alloc_size = len + 6 * page_size;
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void *p = mmap(NULL, alloc_size, PROT_READ | PROT_WRITE,
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MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
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if (MAP_FAILED == p)
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perror_msg_and_fail("mmap(%zu)", alloc_size);
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void *start_work = p + 3 * page_size;
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void *tail_guard = start_work + len;
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if (munmap(p, page_size) ||
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munmap(p + 2 * page_size, page_size) ||
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munmap(tail_guard, page_size) ||
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munmap(tail_guard + 2 * page_size, page_size))
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perror_msg_and_fail("munmap");
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memset(start_work, 0xff, len);
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return tail_guard - size;
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}
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void *
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tail_memdup(const void *p, const size_t size)
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{
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void *dest = tail_alloc(size);
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memcpy(dest, p, size);
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return dest;
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}
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