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91 lines
2.1 KiB
C
91 lines
2.1 KiB
C
/* Copyright (C) 1991, 1996, 1999 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but 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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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <bits/libc-lock.h>
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#include <stdlib.h>
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#include "exit.h"
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/* Register FUNC to be executed by `exit'. */
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int
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atexit (void (*func) (void))
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{
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struct exit_function *new = __new_exitfn ();
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if (new == NULL)
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return -1;
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new->flavor = ef_at;
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new->func.at = func;
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return 0;
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}
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/* We change global data, so we need locking. */
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__libc_lock_define_initialized (static, lock)
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static struct exit_function_list initial;
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struct exit_function_list *__exit_funcs = &initial;
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struct exit_function *
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__new_exitfn (void)
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{
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struct exit_function_list *l;
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size_t i = 0;
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__libc_lock_lock (lock);
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for (l = __exit_funcs; l != NULL; l = l->next)
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{
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for (i = 0; i < l->idx; ++i)
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if (l->fns[i].flavor == ef_free)
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break;
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if (i < l->idx)
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break;
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if (l->idx < sizeof (l->fns) / sizeof (l->fns[0]))
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{
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i = l->idx++;
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break;
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}
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}
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if (l == NULL)
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{
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l = (struct exit_function_list *)
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malloc (sizeof (struct exit_function_list));
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if (l != NULL)
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{
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l->next = __exit_funcs;
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__exit_funcs = l;
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l->idx = 1;
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i = 0;
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}
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}
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/* Mark entry as used, but we don't know the flavor now. */
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if (l != NULL)
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l->fns[i].flavor = ef_us;
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__libc_lock_unlock (lock);
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return l == NULL ? NULL : &l->fns[i];
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}
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