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/* Determine the virtual memory area of a given address.
Copyright (C) 2002, 2006 Bruno Haible <bruno@clisp.org>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software Foundation,
Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
#ifndef _STACKVMA_H
#define _STACKVMA_H
/* Describes a virtual memory area, with some info about the gap between
it and the next or previous virtual memory area. */
struct vma_struct
{
unsigned long start;
unsigned long end;
#if STACK_DIRECTION < 0
/* Info about the gap between this VMA and the previous one.
addr must be < vma->start. */
int (*is_near_this) (unsigned long addr, struct vma_struct *vma);
/* Private field, not provided by all sigsegv_get_vma implementations. */
unsigned long prev_end;
#endif
#if STACK_DIRECTION > 0
/* Info about the gap between this VMA and the next one.
addr must be > vma->end - 1. */
int (*is_near_this) (unsigned long addr, struct vma_struct *vma);
/* Private field, not provided by all sigsegv_get_vma implementations. */
unsigned long next_start;
#endif
};
/* Determines the virtual memory area to which a given address belongs,
and returns 0. Returns -1 if it cannot be determined.
This function is used to determine the stack extent when a fault occurs. */
extern int sigsegv_get_vma (unsigned long address, struct vma_struct *vma);
#endif /* _STACKVMA_H */
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