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/* Determine the virtual memory area of a given address.
Copyright (C) 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. */
/* This file contains the proximity test function for the simple cases, where
the OS has an API for enumerating the mapped ranges of virtual memory. */
#if STACK_DIRECTION < 0
/* Info about the gap between this VMA and the previous one.
addr must be < vma->start. */
static int
simple_is_near_this (unsigned long addr, struct vma_struct *vma)
{
return (vma->start - addr <= (vma->start - vma->prev_end) / 2);
}
#endif
#if STACK_DIRECTION > 0
/* Info about the gap between this VMA and the next one.
addr must be > vma->end - 1. */
static int
simple_is_near_this (unsigned long addr, struct vma_struct *vma)
{
return (addr - vma->end < (vma->next_start - vma->end) / 2);
}
#endif
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