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      1 /* libunwind - a platform-independent unwind library
      2    Copyright (C) 2009 Google, Inc
      3 	Contributed by Arun Sharma <arun.sharma (at) google.com>
      4 
      5 Permission is hereby granted, free of charge, to any person obtaining
      6 a copy of this software and associated documentation files (the
      7 "Software"), to deal in the Software without restriction, including
      8 without limitation the rights to use, copy, modify, merge, publish,
      9 distribute, sublicense, and/or sell copies of the Software, and to
     10 permit persons to whom the Software is furnished to do so, subject to
     11 the following conditions:
     12 
     13 The above copyright notice and this permission notice shall be
     14 included in all copies or substantial portions of the Software.
     15 
     16 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
     17 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
     18 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
     19 NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
     20 LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
     21 OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
     22 WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.  */
     23 
     24 #include <unistd.h>
     25 #include <stdio.h>
     26 #include <stdlib.h>
     27 #include <dlfcn.h>
     28 #include <libunwind.h>
     29 
     30 #define panic(args...)				\
     31 	{ fprintf (stderr, args); exit (-1); }
     32 
     33 int verbose;
     34 int num_errors;
     35 int in_unwind;
     36 
     37 void *
     38 malloc(size_t s)
     39 {
     40   static void * (*func)();
     41 
     42   if(!func)
     43     func = (void *(*)()) dlsym(RTLD_NEXT, "malloc");
     44 
     45   if (in_unwind) {
     46     num_errors++;
     47     return NULL;
     48   } else {
     49     return func(s);
     50   }
     51 }
     52 
     53 static void
     54 do_backtrace (void)
     55 {
     56   unw_word_t ip, sp;
     57   unw_cursor_t cursor;
     58   unw_context_t uc;
     59   int ret;
     60 
     61   in_unwind = 1;
     62   unw_getcontext (&uc);
     63   if (unw_init_local (&cursor, &uc) < 0)
     64     panic ("unw_init_local failed!\n");
     65 
     66   do
     67     {
     68       unw_get_reg (&cursor, UNW_REG_IP, &ip);
     69       unw_get_reg (&cursor, UNW_REG_SP, &sp);
     70 
     71       ret = unw_step (&cursor);
     72       if (ret < 0)
     73 	{
     74 	  ++num_errors;
     75 	}
     76     }
     77   while (ret > 0);
     78   in_unwind = 0;
     79 }
     80 
     81 void
     82 foo3 (void)
     83 {
     84   do_backtrace ();
     85 }
     86 
     87 void
     88 foo2 (void)
     89 {
     90   foo3 ();
     91 }
     92 
     93 void
     94 foo1 (void)
     95 {
     96   foo2 ();
     97 }
     98 
     99 int
    100 main (void)
    101 {
    102   foo1();
    103 
    104   if (num_errors > 0)
    105     {
    106       fprintf (stderr, "FAILURE: detected %d errors\n", num_errors);
    107       exit (-1);
    108     }
    109   return 0;
    110 }
    111