src/stackvma-linux.c

   1 /* Determine the virtual memory area of a given address.  Linux version.
   2    Copyright (C) 2002, 2006, 2008  Bruno Haible <bruno@clisp.org>
   3
   4    This program is free software; you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation; either version 2, or (at your option)
   7    any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program; if not, write to the Free Software Foundation,
  16    Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
  17
  18 #include "stackvma.h"
  19 #include <stdio.h>
  20
  21 #include "stackvma-simple.c"
  22 #include "stackvma-rofile.c"
  23
  24 #if HAVE_MINCORE
  25 # define sigsegv_get_vma mincore_get_vma
  26 # define STATIC static
  27 # include "stackvma-mincore.c"
  28 # undef sigsegv_get_vma
  29 #endif
  30
  31 int
  32 sigsegv_get_vma (unsigned long address, struct vma_struct *vma)
  33 {
  34   struct rofile rof;
  35   int c;
  36   unsigned long start, end;
  37 #if STACK_DIRECTION < 0
  38   unsigned long prev;
  39 #endif
  40
  41   /* Open the current process' maps file.  It describes one VMA per line.  */
  42   if (rof_open (&rof, "/proc/self/maps") < 0)
  43     goto failed;
  44
  45 #if STACK_DIRECTION < 0
  46   prev = 0;
  47 #endif
  48   for (;;)
  49     {
  50       if (!(rof_scanf_lx (&rof, &start) >= 0
  51             && rof_getchar (&rof) == '-'
  52             && rof_scanf_lx (&rof, &end) >= 0))
  53         break;
  54       while (c = rof_getchar (&rof), c != -1 && c != '\n')
  55         continue;
  56       if (address >= start && address <= end - 1)
  57         {
  58           vma->start = start;
  59           vma->end = end;
  60 #if STACK_DIRECTION < 0
  61           vma->prev_end = prev;
  62 #else
  63           if (!(rof_scanf_lx (&rof, &vma->next_start) >= 0
  64                 && rof_getchar (&rof) == '-'
  65                 && rof_scanf_lx (&rof, &end) >= 0))
  66             vma->next_start = 0;
  67 #endif
  68           rof_close (&rof);
  69           vma->is_near_this = simple_is_near_this;
  70           return 0;
  71         }
  72 #if STACK_DIRECTION < 0
  73       prev = end;
  74 #endif
  75     }
  76   rof_close (&rof);
  77  failed:
  78 #if HAVE_MINCORE
  79   return mincore_get_vma (address, vma);
  80 #else
  81   return -1;
  82 #endif
  83 }