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  1. /****************************************************************************
  2. *
  3. *                            Open Watcom Project
  4. *
  5. *    Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
  6. *
  7. *  ========================================================================
  8. *
  9. *    This file contains Original Code and/or Modifications of Original
  10. *    Code as defined in and that are subject to the Sybase Open Watcom
  11. *    Public License version 1.0 (the 'License'). You may not use this file
  12. *    except in compliance with the License. BY USING THIS FILE YOU AGREE TO
  13. *    ALL TERMS AND CONDITIONS OF THE LICENSE. A copy of the License is
  14. *    provided with the Original Code and Modifications, and is also
  15. *    available at www.sybase.com/developer/opensource.
  16. *
  17. *    The Original Code and all software distributed under the License are
  18. *    distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  19. *    EXPRESS OR IMPLIED, AND SYBASE AND ALL CONTRIBUTORS HEREBY DISCLAIM
  20. *    ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF
  21. *    MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR
  22. *    NON-INFRINGEMENT. Please see the License for the specific language
  23. *    governing rights and limitations under the License.
  24. *
  25. *  ========================================================================
  26. *
  27. * Description:  Module for adding functions to the atexit() list, as well
  28. *               invoking the functions on library shutdown.
  29. *
  30. ****************************************************************************/
  31.  
  32.  
  33. #include "variety.h"
  34. #include <stdio.h>
  35. #include <stdlib.h>
  36. #include "rtdata.h"
  37. #include "extfunc.h"
  38. #include "rtinit.h"
  39.  
  40. #define EXIT_LIMIT      32
  41.  
  42. static  void    (* _HUGEDATA _ExitList[EXIT_LIMIT])( void );
  43. static  int     _ExitCount;
  44.  
  45. int atexit( void (*func)( void ) )
  46. {
  47.     if( _ExitCount < EXIT_LIMIT ) {
  48.         _ExitList[ _ExitCount++ ] = func;
  49.         return( 0 );                /* indicate added successfully */
  50.     }
  51.     return( -1 );                   /* indicate no room */
  52. }
  53.  
  54. typedef void exit_fn( void );
  55. #if defined(_M_IX86)
  56.     #pragma aux (__outside_CLIB) exit_fn;
  57. #endif
  58.  
  59. static void _Full_at_exit_rtn( void )
  60. {
  61.     int         count;
  62.     exit_fn     *func;
  63.  
  64.     count = _ExitCount;
  65.     if( count == ( EXIT_LIMIT + 1 ) ) {
  66.         return;                     /* already done once */
  67.     }
  68.     _ExitCount = EXIT_LIMIT + 1;    /* prevent others being registered */
  69.     /* call functions in reverse order of their registration */
  70.     while( count != 0 ) {
  71.         --count;
  72.         func = _ExitList[ count ];
  73.         (*func)();                 /* invoke user exit routine */
  74.     }
  75. }
  76.  
  77. AYI( _Full_at_exit_rtn, INIT_PRIORITY_PROGRAM + 32 );
  78.