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/* Based on code marked: */
/*-
* Copyright (c) 1990, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Chris Torek.
*
* 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
*
* from: FreeBSD: src/lib/libc/stdlib/atexit.c,v 1.7 2003/12/19 17:11:20 kan Exp
*
*/
/*
* Copyright (c) 2004 Marius Strobl <marius@alchemy.franken.de>.
* All rights reserved.
*
* The same license as above applies. If clause 3 of the license in the
* above mentioned file gets removed this file should follow and this
* sentence should get removed.
*
*/
#include <sys/cdefs.h>
#include <stddef.h>
#include <stdlib.h>
#include <unistd.h>
#include <osreldate.h>
#if __FreeBSD_version >= 502101
#error "Not required on this version of FreeBSD."
#endif
#define ATEXIT_FN_EMPTY 0
#define ATEXIT_FN_STD 1
#define ATEXIT_FN_CXA 2
/* must be at least 32 to guarantee ANSI conformance */
#define ATEXIT_SIZE 32
extern int __isthreaded;
#if __FreeBSD_version < 500016
typedef struct {
volatile long access_lock;
volatile long lock_owner;
volatile char *fname;
volatile int lineno;
} spinlock_t;
#define _SPINLOCK_INITIALIZER { 0, 0, 0, 0 }
#define _SPINUNLOCK(_lck) (_lck)->access_lock = 0
#ifdef _LOCK_DEBUG
#define _SPINLOCK(_lck) _spinlock_debug(_lck, __FILE__, __LINE__)
#else
#define _SPINLOCK(_lck) _spinlock(_lck)
#endif
static spinlock_t thread_lock = _SPINLOCK_INITIALIZER;
#define _ATEXIT_LOCK() if (__isthreaded) _SPINLOCK(&thread_lock);
#define _ATEXIT_UNLOCK() if (__isthreaded) _SPINUNLOCK(&thread_lock);
#else
#include <pthread.h>
static pthread_mutex_t atexit_mutex = PTHREAD_MUTEX_INITIALIZER;
#define _ATEXIT_LOCK() if (__isthreaded) \
_pthread_mutex_lock(&atexit_mutex)
#define _ATEXIT_UNLOCK() if (__isthreaded) \
_pthread_mutex_unlock(&atexit_mutex)
#endif
struct atexit {
struct atexit *next; /* next in list */
int ind; /* next index in this table */
struct atexit_fn {
int fn_type; /* ATEXIT_? from above */
union {
void (*std_func)(void);
void (*cxa_func)(void *);
} fn_ptr; /* function pointer */
void *fn_arg; /* argument for CXA callback */
void *fn_dso; /* shared module handle */
} fns[ATEXIT_SIZE]; /* the table itself */
};
static struct atexit *__atexit; /* points to head of LIFO stack */
/*
* Register the function described by 'fptr' to be called at application
* exit or owning shared object unload time. This is a helper function
* for atexit and __cxa_atexit.
*/
static int
atexit_register(struct atexit_fn *fptr)
{
static struct atexit __atexit0; /* one guaranteed table */
struct atexit *p;
_ATEXIT_LOCK();
if ((p = __atexit) == NULL)
__atexit = p = &__atexit0;
else while (p->ind >= ATEXIT_SIZE) {
struct atexit *old__atexit;
old__atexit = __atexit;
_ATEXIT_UNLOCK();
if ((p = (struct atexit *)malloc(sizeof(*p))) == NULL)
return (-1);
_ATEXIT_LOCK();
if (old__atexit != __atexit) {
/* Lost race, retry operation */
_ATEXIT_UNLOCK();
free(p);
_ATEXIT_LOCK();
p = __atexit;
continue;
}
p->ind = 0;
p->next = __atexit;
__atexit = p;
}
p->fns[p->ind++] = *fptr;
_ATEXIT_UNLOCK();
return 0;
}
/*
* Register a function to be performed at exit or when an shared object
* with given dso handle is unloaded dynamically.
*/
int
__cxa_atexit(void (*func)(void *), void *arg, void *dso)
{
struct atexit_fn fn;
int error;
fn.fn_type = ATEXIT_FN_CXA;
fn.fn_ptr.cxa_func = func;;
fn.fn_arg = arg;
fn.fn_dso = dso;
error = atexit_register(&fn);
return (error);
}
/*
* Call all handlers registered with __cxa_atexit for the shared
* object owning 'dso'. Note: if 'dso' is NULL, then all remaining
* handlers are called.
*/
void
__cxa_finalize(void *dso)
{
struct atexit *p;
struct atexit_fn fn;
int n;
_ATEXIT_LOCK();
for (p = __atexit; p; p = p->next) {
for (n = p->ind; --n >= 0;) {
if (p->fns[n].fn_type == ATEXIT_FN_EMPTY)
continue; /* already been called */
if (dso != NULL && dso != p->fns[n].fn_dso)
continue; /* wrong DSO */
fn = p->fns[n];
/*
Mark entry to indicate that this particular handler
has already been called.
*/
p->fns[n].fn_type = ATEXIT_FN_EMPTY;
_ATEXIT_UNLOCK();
/* Call the function of correct type. */
if (fn.fn_type == ATEXIT_FN_CXA)
fn.fn_ptr.cxa_func(fn.fn_arg);
else if (fn.fn_type == ATEXIT_FN_STD)
fn.fn_ptr.std_func();
_ATEXIT_LOCK();
}
}
_ATEXIT_UNLOCK();
}
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