215 lines
6.2 KiB
C
215 lines
6.2 KiB
C
/* Based on code marked: */
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/*-
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* Copyright (c) 1990, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Chris Torek.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: FreeBSD: src/lib/libc/stdlib/atexit.c,v 1.7 2003/12/19 17:11:20 kan Exp
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*
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*/
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/*
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* Copyright (c) 2004 Marius Strobl <marius@alchemy.franken.de>.
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* All rights reserved.
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*
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* The same license as above applies. If clause 3 of the license in the
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* above mentioned file gets removed this file should follow and this
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* sentence should get removed.
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*
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD: /tmp/pcvs/ports/lang/ifc/files/cxa_atexit.c,v 1.3 2004-01-31 23:32:41 maho Exp $");
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#include <stddef.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <osreldate.h>
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#if __FreeBSD_version >= 502101
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#error "Not required on this version of FreeBSD."
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#endif
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#define ATEXIT_FN_EMPTY 0
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#define ATEXIT_FN_STD 1
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#define ATEXIT_FN_CXA 2
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/* must be at least 32 to guarantee ANSI conformance */
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#define ATEXIT_SIZE 32
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extern int __isthreaded;
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#if __FreeBSD_version < 500016
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typedef struct {
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volatile long access_lock;
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volatile long lock_owner;
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volatile char *fname;
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volatile int lineno;
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} spinlock_t;
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#define _SPINLOCK_INITIALIZER { 0, 0, 0, 0 }
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#define _SPINUNLOCK(_lck) (_lck)->access_lock = 0
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#ifdef _LOCK_DEBUG
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#define _SPINLOCK(_lck) _spinlock_debug(_lck, __FILE__, __LINE__)
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#else
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#define _SPINLOCK(_lck) _spinlock(_lck)
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#endif
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static spinlock_t thread_lock = _SPINLOCK_INITIALIZER;
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#define _ATEXIT_LOCK() if (__isthreaded) _SPINLOCK(&thread_lock);
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#define _ATEXIT_UNLOCK() if (__isthreaded) _SPINUNLOCK(&thread_lock);
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#else
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#include <pthread.h>
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static pthread_mutex_t atexit_mutex = PTHREAD_MUTEX_INITIALIZER;
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#define _ATEXIT_LOCK() if (__isthreaded) \
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_pthread_mutex_lock(&atexit_mutex)
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#define _ATEXIT_UNLOCK() if (__isthreaded) \
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_pthread_mutex_unlock(&atexit_mutex)
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#endif
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struct atexit {
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struct atexit *next; /* next in list */
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int ind; /* next index in this table */
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struct atexit_fn {
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int fn_type; /* ATEXIT_? from above */
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union {
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void (*std_func)(void);
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void (*cxa_func)(void *);
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} fn_ptr; /* function pointer */
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void *fn_arg; /* argument for CXA callback */
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void *fn_dso; /* shared module handle */
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} fns[ATEXIT_SIZE]; /* the table itself */
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};
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static struct atexit *__atexit; /* points to head of LIFO stack */
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/*
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* Register the function described by 'fptr' to be called at application
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* exit or owning shared object unload time. This is a helper function
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* for atexit and __cxa_atexit.
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*/
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static int
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atexit_register(struct atexit_fn *fptr)
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{
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static struct atexit __atexit0; /* one guaranteed table */
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struct atexit *p;
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_ATEXIT_LOCK();
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if ((p = __atexit) == NULL)
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__atexit = p = &__atexit0;
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else while (p->ind >= ATEXIT_SIZE) {
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struct atexit *old__atexit;
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old__atexit = __atexit;
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_ATEXIT_UNLOCK();
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if ((p = (struct atexit *)malloc(sizeof(*p))) == NULL)
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return (-1);
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_ATEXIT_LOCK();
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if (old__atexit != __atexit) {
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/* Lost race, retry operation */
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_ATEXIT_UNLOCK();
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free(p);
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_ATEXIT_LOCK();
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p = __atexit;
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continue;
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}
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p->ind = 0;
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p->next = __atexit;
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__atexit = p;
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}
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p->fns[p->ind++] = *fptr;
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_ATEXIT_UNLOCK();
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return 0;
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}
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/*
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* Register a function to be performed at exit or when an shared object
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* with given dso handle is unloaded dynamically.
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*/
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int
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__cxa_atexit(void (*func)(void *), void *arg, void *dso)
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{
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struct atexit_fn fn;
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int error;
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fn.fn_type = ATEXIT_FN_CXA;
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fn.fn_ptr.cxa_func = func;;
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fn.fn_arg = arg;
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fn.fn_dso = dso;
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error = atexit_register(&fn);
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return (error);
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}
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/*
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* Call all handlers registered with __cxa_atexit for the shared
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* object owning 'dso'. Note: if 'dso' is NULL, then all remaining
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* handlers are called.
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*/
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void
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__cxa_finalize(void *dso)
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{
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struct atexit *p;
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struct atexit_fn fn;
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int n;
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_ATEXIT_LOCK();
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for (p = __atexit; p; p = p->next) {
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for (n = p->ind; --n >= 0;) {
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if (p->fns[n].fn_type == ATEXIT_FN_EMPTY)
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continue; /* already been called */
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if (dso != NULL && dso != p->fns[n].fn_dso)
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continue; /* wrong DSO */
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fn = p->fns[n];
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/*
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Mark entry to indicate that this particular handler
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has already been called.
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*/
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p->fns[n].fn_type = ATEXIT_FN_EMPTY;
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_ATEXIT_UNLOCK();
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/* Call the function of correct type. */
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if (fn.fn_type == ATEXIT_FN_CXA)
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fn.fn_ptr.cxa_func(fn.fn_arg);
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else if (fn.fn_type == ATEXIT_FN_STD)
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fn.fn_ptr.std_func();
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_ATEXIT_LOCK();
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}
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}
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_ATEXIT_UNLOCK();
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}
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