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/* Memory allocation next to an unmapped page.
Copyright (C) 2017-2023 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
<https://www.gnu.org/licenses/>. */
#ifndef SUPPORT_NEXT_TO_FAULT_H
#define SUPPORT_NEXT_TO_FAULT_H
#include <sys/cdefs.h>
#include <sys/types.h>
__BEGIN_DECLS
/* The memory region created by next_to_fault_allocate. */
struct support_next_to_fault
{
/* The user data. */
char *buffer;
size_t length;
/* The entire allocated region. */
void *region_start;
size_t region_size;
};
/* Allocate a buffer of SIZE bytes just before a page which is mapped
with PROT_NONE (so that overrunning the buffer will cause a
fault). */
struct support_next_to_fault support_next_to_fault_allocate (size_t size);
/* Deallocate the memory region allocated by
next_to_fault_allocate. */
void support_next_to_fault_free (struct support_next_to_fault *);
#endif /* SUPPORT_NEXT_TO_FAULT_H */
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