C++ atexit() doesn't work

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2 total messages Started by Harold Zatz Mon, 04 Jan 1993 22:17

#44

Author: Harold Zatz
Date: Mon, 04 Jan 1993 22:17

28 lines
983 bytes

On an Elan R4000, running 4.0.5F, with a version of the C++ library
that looks like:
krazy % ll /usr/lib/libC.a
-r--r--r--   1 root     wheel     161188 Oct  2 19:48 /usr/lib/libC.a

atexit() doesn't work with C++. Try this program:
-----test.c-----
#include <stdlib.h>
#include <stdio.h>

void doMe() {
    fprintf( stderr, "atexit() works!\n" );
    }

main() {
    atexit( doMe );
    exit( 0 );
    }
-------
krazy % cc -o test test.c
krazy % test
atexit() works!
krazy % CC -o test test.c
krazy % test

	Fixes? Workarounds? Anyone?

	--Harold Zatz

Re: C++ atexit() doesn't work

#46

Author: Shankar Unni
Date: Tue, 05 Jan 1993 01:43

59 lines
1852 bytes

Harold Zatz (hzatz@cco.caltech.edu) wrote:

> krazy % CC -o test test.c
> krazy % test

An artifact of the woefully unportable AT&T C++ library. It has a
replacement for "exit()" that is totally bogus (it's pre-ANSI C, and
doesn't look for atexit() functions).

> 	Fixes? Workarounds? Anyone?

Solution (it's a little crude for the moment):

  1.  Create the following compilation unit:

      exit.c:

        /* --- cut here --- */

	extern "C" {
		extern void _exit(int);
		extern void __call_exitfns();
		extern void _cleanup();
	}
	extern void __dtors();

	extern "C" {
	extern void exit(int i);
	}

	extern void exit(int i)
	{
		__call_exitfns();		/* This is the fix */
		__dtors();
		_cleanup();
		_exit(i);
	}

        /* --- cut here --- */
           
  2.  To use this fix:

      (a) Compile it, and link it with your application as the last object
          file in the link list.  CAUTION: ensure that you have at least
	  *ONE* exit() call in your code, otherwise the version of exit()
	  in libC.a will be picked up. (Old-time Unix'ers will know why).

          OR

      (b) Replace the file in /usr/lib/libC.a:

            # ar rv /usr/lib/libC.a exit.o

          Be careful with the last: You may want to save the old libC.a
          before doing this, in case anything goes wrong..

--
Shankar Unni				E-Mail:	shankar@sgi.com
Silicon Graphics Inc.			Phone:	+1-415-390-2072

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