使用 try/catch 确定程序在内存中的位置？

我把指针移到内存的开头p = 0，增加它，记住（noerr）没有错误发生的时刻。然后我寻找错误再次出现的时刻（err）。[noerr; err)原来是程序在内存区间。但是代码在第一次迭代时就已经崩溃了。

Ошибка сегментирования (сделан дамп памяти)

编码：

#include <iostream>
using namespace std;

int main()
{
  char *p = 0, *noerr = 0, *err = 0;
  while (1) {
    try {
      char c = *p;
      if (!noerr) {
          noerr = p;
          cout << "noerr: " << (int)noerr << endl;
      }
    } catch (...) {
      p++;
      if (noerr) {
          err = p;
          cout << "err: " << (int)err << endl;
          break;
      }
    }
  }
}

为什么try/catch它不捕获错误？我怎样才能修复该程序，使其按我的预期工作？

操作系统：Linux。

解决方案

main.cpp:

#include <iostream>
#include <csignal>
#include <cstdio>
#include <cstdlib>
#include <fstream>
using namespace std;

int main();

char *begin_ptr;

void find_begin() {
  char *p = (char*) main;
  while (1) {
    begin_ptr = p;
    char c = *(--p);
  }
}

void find_end() {
  char *p = (char*) main;
  while (1) {
    ofstream f("end.txt");
    f << (int) p;
    f.close();
    char c = *(++p);
  }
}

void sig_handler(int signo) {
  ofstream f("begin.txt");
  f << (int) begin_ptr;
  f.close();
  cout << "Signal " << signo << endl;
  cout << "begin_ptr: " << (int) begin_ptr << endl;
  cout << "dist from begin to main: " << ((char*)main - begin_ptr) << endl;
  find_end();
  exit(0);
}

void HandlerRun () {
  printf("Sig Handle Initialized!\n");
  signal(SIGSEGV, sig_handler);
  signal(SIGSTOP, sig_handler);
  signal(SIGTERM, sig_handler);
  // signal(SIGKILL, sig_handler);
  signal(SIGABRT, sig_handler);
  signal(SIGINT , sig_handler);
}

int main() {
  HandlerRun();
  ofstream f("main.txt");
  f << (int) main;
  f.close();
  cout << "main: " << (int) main << endl;
  find_begin();
}

main.sh:

./main > /dev/null
beg=$(cat begin.txt)
end=$(cat end.txt)
echo begin: $beg
echo end: $end
echo end - begin: $(echo $end - $beg | bc)

输出示例：

begin: 134512640
end: 134529023
end - begin: 16383