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/* Copyright (C) 1991-2022 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <assert.h>
#include <stdlib.h>
#include "exit.h"
#include <pointer_guard.h>
/* Register a function to be called by exit. */
int
__on_exit (void (*func) (int status, void *arg), void *arg)
{
struct exit_function *new;
/* As a QoI issue we detect NULL early with an assertion instead
of a SIGSEGV at program exit when the handler is run (bug 20544). */
assert (func != NULL);
__libc_lock_lock (__exit_funcs_lock);
new = __new_exitfn (&__exit_funcs);
if (new == NULL)
{
__libc_lock_unlock (__exit_funcs_lock);
return -1;
}
PTR_MANGLE (func);
new->func.on.fn = func;
new->func.on.arg = arg;
new->flavor = ef_on;
__libc_lock_unlock (__exit_funcs_lock);
return 0;
}
weak_alias (__on_exit, on_exit)
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