|
Packit |
6c4009 |
/* Copyright (C) 1999-2018 Free Software Foundation, Inc.
|
|
Packit |
6c4009 |
This file is part of the GNU C Library.
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
The GNU C Library is free software; you can redistribute it and/or
|
|
Packit |
6c4009 |
modify it under the terms of the GNU Lesser General Public
|
|
Packit |
6c4009 |
License as published by the Free Software Foundation; either
|
|
Packit |
6c4009 |
version 2.1 of the License, or (at your option) any later version.
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
The GNU C Library is distributed in the hope that it will be useful,
|
|
Packit |
6c4009 |
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
Packit |
6c4009 |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Packit |
6c4009 |
Lesser General Public License for more details.
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
You should have received a copy of the GNU Lesser General Public
|
|
Packit |
6c4009 |
License along with the GNU C Library; if not, see
|
|
Packit |
6c4009 |
<http://www.gnu.org/licenses/>. */
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
#include <assert.h>
|
|
Packit |
6c4009 |
#include <stdlib.h>
|
|
Packit |
6c4009 |
#include <stdint.h>
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
#include <libc-lock.h>
|
|
Packit |
6c4009 |
#include "exit.h"
|
|
Packit |
6c4009 |
#include <sysdep.h>
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
#undef __cxa_atexit
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
/* See concurrency notes in stdlib/exit.h where this lock is declared. */
|
|
Packit |
6c4009 |
__libc_lock_define_initialized (, __exit_funcs_lock)
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
int
|
|
Packit |
6c4009 |
attribute_hidden
|
|
Packit |
6c4009 |
__internal_atexit (void (*func) (void *), void *arg, void *d,
|
|
Packit |
6c4009 |
struct exit_function_list **listp)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
struct exit_function *new;
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
__libc_lock_lock (__exit_funcs_lock);
|
|
Packit |
6c4009 |
new = __new_exitfn (listp);
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
if (new == NULL)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
__libc_lock_unlock (__exit_funcs_lock);
|
|
Packit |
6c4009 |
return -1;
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
#ifdef PTR_MANGLE
|
|
Packit |
6c4009 |
PTR_MANGLE (func);
|
|
Packit |
6c4009 |
#endif
|
|
Packit |
6c4009 |
new->func.cxa.fn = (void (*) (void *, int)) func;
|
|
Packit |
6c4009 |
new->func.cxa.arg = arg;
|
|
Packit |
6c4009 |
new->func.cxa.dso_handle = d;
|
|
Packit |
6c4009 |
new->flavor = ef_cxa;
|
|
Packit |
6c4009 |
__libc_lock_unlock (__exit_funcs_lock);
|
|
Packit |
6c4009 |
return 0;
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
/* Register a function to be called by exit or when a shared library
|
|
Packit |
6c4009 |
is unloaded. This function is only called from code generated by
|
|
Packit |
6c4009 |
the C++ compiler. */
|
|
Packit |
6c4009 |
int
|
|
Packit |
6c4009 |
__cxa_atexit (void (*func) (void *), void *arg, void *d)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
return __internal_atexit (func, arg, d, &__exit_funcs);
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
libc_hidden_def (__cxa_atexit)
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
static struct exit_function_list initial;
|
|
Packit |
6c4009 |
struct exit_function_list *__exit_funcs = &initial;
|
|
Packit |
6c4009 |
uint64_t __new_exitfn_called;
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
/* Must be called with __exit_funcs_lock held. */
|
|
Packit |
6c4009 |
struct exit_function *
|
|
Packit |
6c4009 |
__new_exitfn (struct exit_function_list **listp)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
struct exit_function_list *p = NULL;
|
|
Packit |
6c4009 |
struct exit_function_list *l;
|
|
Packit |
6c4009 |
struct exit_function *r = NULL;
|
|
Packit |
6c4009 |
size_t i = 0;
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
if (__exit_funcs_done)
|
|
Packit |
6c4009 |
/* Exit code is finished processing all registered exit functions,
|
|
Packit |
6c4009 |
therefore we fail this registration. */
|
|
Packit |
6c4009 |
return NULL;
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
for (l = *listp; l != NULL; p = l, l = l->next)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
for (i = l->idx; i > 0; --i)
|
|
Packit |
6c4009 |
if (l->fns[i - 1].flavor != ef_free)
|
|
Packit |
6c4009 |
break;
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
if (i > 0)
|
|
Packit |
6c4009 |
break;
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
/* This block is completely unused. */
|
|
Packit |
6c4009 |
l->idx = 0;
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
if (l == NULL || i == sizeof (l->fns) / sizeof (l->fns[0]))
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
/* The last entry in a block is used. Use the first entry in
|
|
Packit |
6c4009 |
the previous block if it exists. Otherwise create a new one. */
|
|
Packit |
6c4009 |
if (p == NULL)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
assert (l != NULL);
|
|
Packit |
6c4009 |
p = (struct exit_function_list *)
|
|
Packit |
6c4009 |
calloc (1, sizeof (struct exit_function_list));
|
|
Packit |
6c4009 |
if (p != NULL)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
p->next = *listp;
|
|
Packit |
6c4009 |
*listp = p;
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
if (p != NULL)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
r = &p->fns[0];
|
|
Packit |
6c4009 |
p->idx = 1;
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
else
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
/* There is more room in the block. */
|
|
Packit |
6c4009 |
r = &l->fns[i];
|
|
Packit |
6c4009 |
l->idx = i + 1;
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
/* Mark entry as used, but we don't know the flavor now. */
|
|
Packit |
6c4009 |
if (r != NULL)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
r->flavor = ef_us;
|
|
Packit |
6c4009 |
++__new_exitfn_called;
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
return r;
|
|
Packit |
6c4009 |
}
|