Back to index

glibc  2.9
backtracesyms.c
Go to the documentation of this file.
00001 /* Return list with names for address in backtrace.
00002    Copyright (C) 1998, 2000 Free Software Foundation, Inc.
00003    This file is part of the GNU C Library.
00004    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
00005 
00006    The GNU C Library is free software; you can redistribute it and/or
00007    modify it under the terms of the GNU Lesser General Public
00008    License as published by the Free Software Foundation; either
00009    version 2.1 of the License, or (at your option) any later version.
00010 
00011    The GNU C Library is distributed in the hope that it will be useful,
00012    but WITHOUT ANY WARRANTY; without even the implied warranty of
00013    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00014    Lesser General Public License for more details.
00015 
00016    You should have received a copy of the GNU Lesser General Public
00017    License along with the GNU C Library; if not, write to the Free
00018    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00019    02111-1307 USA.  */
00020 
00021 #include <execinfo.h>
00022 #include <stdlib.h>
00023 #include <string.h>
00024 
00025 
00026 /* Assume the worst for the width of an address.  */
00027 #define WORD_WIDTH 16
00028 
00029 
00030 char **
00031 __backtrace_symbols (array, size)
00032      void *const *array;
00033      int size;
00034 {
00035   int cnt;
00036   size_t total = 0;
00037   char **result;
00038 
00039   /* We can compute the text size needed for the symbols since we print
00040      them all as "[+0x<addr>]".  */
00041   total = size * (WORD_WIDTH + 6);
00042 
00043   /* Allocate memory for the result.  */
00044   result = malloc (size * sizeof (char *) + total);
00045   if (result != NULL)
00046     {
00047       char *last = (char *) (result + size);
00048 
00049       for (cnt = 0; cnt < size; ++cnt)
00050        {
00051          result[cnt] = last;
00052          last += 1 + sprintf (last, "[+%p]", array[cnt]);
00053        }
00054     }
00055 
00056   return result;
00057 }
00058 weak_alias (__backtrace_symbols, backtrace_symbols)