git.m6w6.name Git - m6w6/libmemcached/blob - libtest/backtrace_test.cc

   1 /*  vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
   2  *
   3  *  Data Differential YATL (i.e. libtest)  library
   4  *
   5  *  Copyright (C) 2012 Data Differential, http://datadifferential.com/
   6  *
   7  *  Redistribution and use in source and binary forms, with or without
   8  *  modification, are permitted provided that the following conditions are
   9  *  met:
  10  *
  11  *      * Redistributions of source code must retain the above copyright
  12  *  notice, this list of conditions and the following disclaimer.
  13  *
  14  *      * Redistributions in binary form must reproduce the above
  15  *  copyright notice, this list of conditions and the following disclaimer
  16  *  in the documentation and/or other materials provided with the
  17  *  distribution.
  18  *
  19  *      * The names of its contributors may not be used to endorse or
  20  *  promote products derived from this software without specific prior
  21  *  written permission.
  22  *
  23  *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  24  *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  25  *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  26  *  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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  31  *  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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  33  *  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  34  *
  35  */
  36
  37 #include <cerrno>
  38 #include <csignal>
  39 #include <cstdio>
  40 #include <cstdlib>
  41 #include <cstring>
  42 #include <iostream>
  43
  44 #include "libmemcached/backtrace.hpp"
  45
  46 class Test {
  47 public:
  48   Test()
  49   {
  50   }
  51
  52   void call_backtrace()
  53   {
  54     std::cerr << __func__ << std::endl;
  55     custom_backtrace();
  56   }
  57 };
  58
  59 void SIGSEGV_handler(int sig_num, siginfo_t* info, void* ucontext)
  60 {
  61   std::cerr << __func__ << std::endl;
  62   (void)sig_num;
  63   (void)info;
  64   (void)ucontext;
  65
  66   custom_backtrace();
  67 }
  68
  69 int raise_SIGSEGV()
  70 {
  71   std::cerr << std::endl << "Calling backtrace()" << std::endl;
  72   custom_backtrace();
  73   std::cerr << std::endl << "Calling raise()" << std::endl;
  74   return raise(SIGSEGV);
  75 }
  76
  77 int layer4()
  78 {
  79   return raise_SIGSEGV();
  80 }
  81
  82 int layer3()
  83 {
  84   return layer4();
  85 }
  86
  87 int layer2()
  88 {
  89   return layer3();
  90 }
  91
  92 int layer1()
  93 {
  94   return layer2();
  95 }
  96
  97 int main(int, char **)
  98 {
  99   Test t;
 100
 101   t.call_backtrace();
 102
 103   struct sigaction sigact;
 104
 105   sigact.sa_sigaction= SIGSEGV_handler;
 106   sigact.sa_flags= SA_RESTART | SA_SIGINFO;
 107
 108   if (sigaction(SIGSEGV, &sigact, (struct sigaction *)NULL) != 0)
 109   {
 110     std::cerr << "error setting signal handler for " << strsignal(SIGSEGV) << "(" <<  SIGSEGV << ")" << std::endl;
 111
 112     exit(EXIT_FAILURE);
 113   }
 114
 115   int ret= layer1();
 116   if (ret)
 117   {
 118     std::cerr << "raise() " << strerror(errno) << std::endl;
 119     exit(EXIT_FAILURE);
 120   }
 121
 122   exit(EXIT_SUCCESS);
 123 }