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100 lines
2.9 KiB
C
100 lines
2.9 KiB
C
/* Generic atexit()
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Copyright (C) 1996 Free Software Foundation, Inc.
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This file is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the
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Free Software Foundation; either version 2, or (at your option) any
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later version.
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In addition to the permissions in the GNU General Public License, the
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Free Software Foundation gives you unlimited permission to link the
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compiled version of this file with other programs, and to distribute
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those programs without any restriction coming from the use of this
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file. (The General Public License restrictions do apply in other
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respects; for example, they cover modification of the file, and
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distribution when not linked into another program.)
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This file is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; see the file COPYING. If not, write to
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the Free Software Foundation, 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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/* As a special exception, if you link this library with files
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compiled with GCC to produce an executable, this does not cause
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the resulting executable to be covered by the GNU General Public License.
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This exception does not however invalidate any other reasons why
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the executable file might be covered by the GNU General Public License. */
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/* Rather than come up with some ugly hack to make mcrt1 work, it is
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better to just go ahead and provide atexit(). */
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#include <stdlib.h>
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void exit(int) __attribute__((noreturn));
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void _exit(int) __attribute__((noreturn));
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void _cleanup(void);
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#define FNS_PER_BLOCK 32
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struct atexit_fn_block
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{
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struct atexit_fn_block *next;
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void (*fns[FNS_PER_BLOCK])(void);
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short used;
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};
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/* staticly allocate the first block */
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static struct atexit_fn_block atexit_fns;
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static struct atexit_fn_block *current_block = &atexit_fns;
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int atexit(void (*fn)(void))
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{
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if (current_block->used >= FNS_PER_BLOCK)
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{
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struct atexit_fn_block *new_block =
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(struct atexit_fn_block *)malloc(sizeof(struct atexit_fn_block));
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if (new_block == NULL)
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return -1;
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new_block->used = 0;
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new_block->next = current_block;
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current_block = new_block;
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}
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current_block->fns[current_block->used++] = fn;
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return 0;
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}
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void exit(int status)
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{
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struct atexit_fn_block *block = current_block, *old_block;
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short i;
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while (1)
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{
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for (i = block->used; --i >= 0 ;)
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(*block->fns[i])();
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if (block == &atexit_fns)
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break;
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/* I know what you are thinking -- we are about to exit, why free?
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Because it is friendly to memory leak detectors, that's why. */
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old_block = block;
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block = block->next;
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free(old_block);
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}
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_exit(status);
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}
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