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/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2011 David Chisnall
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD: head/lib/libc/stdlib/quick_exit.c 326193 2017-11-25 17:12:48Z pfg $
*/
#include <sys/types.h>
#include <machine/atomic.h>
#include <stdlib.h>
#include <pthread.h>
/**
* Linked list of quick exit handlers. This is simpler than the atexit()
* version, because it is not required to support C++ destructors or
* DSO-specific cleanups.
*/
struct quick_exit_handler {
struct quick_exit_handler *next;
void (*cleanup)(void);
};
/**
* Lock protecting the handlers list.
*/
static pthread_mutex_t atexit_mutex = PTHREAD_MUTEX_INITIALIZER;
/**
* Stack of cleanup handlers. These will be invoked in reverse order when
*/
static struct quick_exit_handler *handlers;
int
at_quick_exit(void (*func)(void))
{
struct quick_exit_handler *h;
h = malloc(sizeof(*h));
if (NULL == h)
return (1);
h->cleanup = func;
pthread_mutex_lock(&atexit_mutex);
h->next = handlers;
__compiler_membar();
handlers = h;
pthread_mutex_unlock(&atexit_mutex);
return (0);
}
void
quick_exit(int status)
{
struct quick_exit_handler *h;
/*
* XXX: The C++ spec requires us to call std::terminate if there is an
* exception here.
*/
for (h = handlers; NULL != h; h = h->next) {
__compiler_membar();
h->cleanup();
}
_Exit(status);
}
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