Re: exit() from within C++ program

From:
Old Wolf <oldwolf@inspire.net.nz>
Newsgroups:
comp.lang.c++
Date:
9 May 2007 22:17:37 -0700
Message-ID:
<1178774257.718357.58440@e65g2000hsc.googlegroups.com>
On May 10, 3:26 pm, chris <craph...@indiana.edu> wrote:

Without changing each instance of exit to something else, I would like to
change things so that my program will at least terminate normally,
maybe with a concilliatory message.


You could do that by registering a handler with atexit(). In fact
this is possible in C as well.

Of course a better solution is to design your C API so that
it returns error codes instead of calling exit().

NB. Here is a brutal hack I thought of that might work.
In a common header file for your C code (that is NOT
included by any C++ code), write:
  #define exit(arg) hack_exit(arg)
  void hack_exit(int x);

Then in one of the C++ modules write:
  extern "C" void hack_exit(int x) {
    throw std::runtime_error("C code tried to exit");
  }

Then any attempted exit by the C code would show up as an
exception that can be handled by the C++ part. Which could
even just be wrapping main:

  int main2() { /* the main program */ }
  int main() {
   try { main2(); }
   catch(std::execption &e) { std::cout << "Aborting: " << e.what() <<
std::endl; }
  }

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