dlls/msvcrt/onexit.c

   1 /*
   2  * msvcrt onexit functions
   3  *
   4  * Copyright 2016 Nikolay Sivov
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  */
  20
  21 /* these functions are part of the import lib for compatibility with the Mingw runtime */
  22 #if 0
  23 #pragma makedep implib
  24 #endif
  25
  26 #include <process.h>
  27 #include "msvcrt.h"
  28 #include "mtdll.h"
  29
  30
  31 /*********************************************************************
  32  *              _initialize_onexit_table (UCRTBASE.@)
  33  */
  34 int __cdecl _initialize_onexit_table(_onexit_table_t *table)
  35 {
  36     if (!table)
  37         return -1;
  38
  39     if (table->_first == table->_end)
  40         table->_last = table->_end = table->_first = NULL;
  41     return 0;
  42 }
  43
  44
  45 /*********************************************************************
  46  *              _register_onexit_function (UCRTBASE.@)
  47  */
  48 int __cdecl _register_onexit_function(_onexit_table_t *table, _onexit_t func)
  49 {
  50     if (!table)
  51         return -1;
  52
  53     _lock(_EXIT_LOCK1);
  54     if (!table->_first)
  55     {
  56         table->_first = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, 32 * sizeof(void *));
  57         if (!table->_first)
  58         {
  59             _unlock(_EXIT_LOCK1);
  60             return -1;
  61         }
  62         table->_last = table->_first;
  63         table->_end = table->_first + 32;
  64     }
  65
  66     /* grow if full */
  67     if (table->_last == table->_end)
  68     {
  69         int len = table->_end - table->_first;
  70         _PVFV *tmp = HeapReAlloc(GetProcessHeap(), 0, table->_first, 2 * len * sizeof(void *));
  71         if (!tmp)
  72         {
  73             _unlock(_EXIT_LOCK1);
  74             return -1;
  75         }
  76         table->_first = tmp;
  77         table->_end = table->_first + 2 * len;
  78         table->_last = table->_first + len;
  79     }
  80
  81     *table->_last = (_PVFV)func;
  82     table->_last++;
  83     _unlock(_EXIT_LOCK1);
  84     return 0;
  85 }
  86
  87
  88 /*********************************************************************
  89  *              _execute_onexit_table (UCRTBASE.@)
  90  */
  91 int __cdecl _execute_onexit_table(_onexit_table_t *table)
  92 {
  93     _PVFV *func;
  94     _onexit_table_t copy;
  95
  96     if (!table)
  97         return -1;
  98
  99     _lock(_EXIT_LOCK1);
 100     if (!table->_first || table->_first >= table->_last)
 101     {
 102         _unlock(_EXIT_LOCK1);
 103         return 0;
 104     }
 105     copy._first = table->_first;
 106     copy._last  = table->_last;
 107     copy._end   = table->_end;
 108     memset(table, 0, sizeof(*table));
 109     _initialize_onexit_table(table);
 110     _unlock(_EXIT_LOCK1);
 111
 112     for (func = copy._last - 1; func >= copy._first; func--)
 113     {
 114         if (*func)
 115            (*func)();
 116     }
 117
 118     HeapFree(GetProcessHeap(), 0, copy._first);
 119     return 0;
 120 }