[apple/libc.git] / stdlib / atexit-fbsd.c

/*-
 * 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.
 */

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)atexit.c	8.2 (Berkeley) 7/3/94";
#endif /* LIBC_SCCS and not lint */
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/lib/libc/stdlib/atexit.c,v 1.7 2003/12/19 17:11:20 kan Exp $");

#include "namespace.h"
#include <stddef.h>
#include <stdlib.h>
#include <unistd.h>
#include <pthread.h>
#if defined(__DYNAMIC__)
#include <dlfcn.h>
#endif /* defined(__DYNAMIC__) */
#include "atexit.h"
#include "un-namespace.h"

#ifdef __BLOCKS__
#include <Block.h>
#endif /* __BLOCKS__ */
#include "libc_private.h"

#define	ATEXIT_FN_EMPTY	0
#define	ATEXIT_FN_STD	1
#define	ATEXIT_FN_CXA	2
#ifdef __BLOCKS__
#define	ATEXIT_FN_BLK	3
#endif /* __BLOCKS__ */

static pthread_mutex_t atexit_mutex = PTHREAD_MUTEX_INITIALIZER;

#define _MUTEX_LOCK(x)		if (__isthreaded) _pthread_mutex_lock(x)
#define _MUTEX_UNLOCK(x)	if (__isthreaded) _pthread_mutex_unlock(x)

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 *);
#ifdef __BLOCKS__
			void (^block)(void);
#endif /* __BLOCKS__ */
		} 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 */
static int new_registration;

/*
 * 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;

	_MUTEX_LOCK(&atexit_mutex);
	if ((p = __atexit) == NULL)
		__atexit = p = &__atexit0;
	else while (p->ind >= ATEXIT_SIZE) {
		struct atexit *old__atexit;
		old__atexit = __atexit;
	        _MUTEX_UNLOCK(&atexit_mutex);
		if ((p = (struct atexit *)malloc(sizeof(*p))) == NULL)
			return (-1);
		_MUTEX_LOCK(&atexit_mutex);
		if (old__atexit != __atexit) {
			/* Lost race, retry operation */
			_MUTEX_UNLOCK(&atexit_mutex);
			free(p);
			_MUTEX_LOCK(&atexit_mutex);
			p = __atexit;
			continue;
		}
		p->ind = 0;
		p->next = __atexit;
		__atexit = p;
	}
	p->fns[p->ind++] = *fptr;
	new_registration = 1;
	_MUTEX_UNLOCK(&atexit_mutex);
	return 0;
}

/*
 * Register a function to be performed at exit.
 */
int
atexit(void (*func)(void))
{
	struct atexit_fn fn;
	struct dl_info info;
	int error;

	fn.fn_type = ATEXIT_FN_STD;
	fn.fn_ptr.std_func = func;
	fn.fn_arg = NULL;
#if defined(__DYNAMIC__)
	if ( dladdr(func, &info) )
		fn.fn_dso = info.dli_fbase;
	else 
		fn.fn_dso = NULL;
#else /* ! defined(__DYNAMIC__) */
	fn.fn_dso = NULL;
#endif /* defined(__DYNAMIC__) */

 	error = atexit_register(&fn);	
	return (error);
}

#ifdef __BLOCKS__
int
atexit_b(void (^block)(void))
{
	struct atexit_fn fn;
	struct dl_info info;
	int error;

	fn.fn_type = ATEXIT_FN_BLK;
	fn.fn_ptr.block = Block_copy(block);
	fn.fn_arg = NULL;
#if defined(__DYNAMIC__)
	if ( dladdr(block, &info) )
		fn.fn_dso = info.dli_fbase;
	else 
		fn.fn_dso = NULL;
#else /* ! defined(__DYNAMIC__) */
	fn.fn_dso = NULL;
#endif /* defined(__DYNAMIC__) */

 	error = atexit_register(&fn);	
	return (error);
}
#endif /* __BLOCKS__ */

/*
 * 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(const void *dso)
{
	struct atexit *p;
	struct atexit_fn fn;
	int n;

	_MUTEX_LOCK(&atexit_mutex);
restart:
	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;
			new_registration = 0;
		        _MUTEX_UNLOCK(&atexit_mutex);
		
			/* 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();
#ifdef __BLOCKS__
			else if (fn.fn_type == ATEXIT_FN_BLK)
				fn.fn_ptr.block();
#endif /* __BLOCKS__ */
			_MUTEX_LOCK(&atexit_mutex);
			if (new_registration)
			    goto restart;
		}
	}
	_MUTEX_UNLOCK(&atexit_mutex);
}
Commit	Line	Data
224c7076 A	1	/*-
	2	* Copyright (c) 1990, 1993
	3	* The Regents of the University of California. All rights reserved.
	4	*
	5	* This code is derived from software contributed to Berkeley by
	6	* Chris Torek.
	7	*
	8	* Redistribution and use in source and binary forms, with or without
	9	* modification, are permitted provided that the following conditions
	10	* are met:
	11	* 1. Redistributions of source code must retain the above copyright
	12	* notice, this list of conditions and the following disclaimer.
	13	* 2. Redistributions in binary form must reproduce the above copyright
	14	* notice, this list of conditions and the following disclaimer in the
	15	* documentation and/or other materials provided with the distribution.
	16	* 3. All advertising materials mentioning features or use of this software
	17	* must display the following acknowledgement:
	18	* This product includes software developed by the University of
	19	* California, Berkeley and its contributors.
	20	* 4. Neither the name of the University nor the names of its contributors
	21	* may be used to endorse or promote products derived from this software
	22	* without specific prior written permission.
	23	*
	24	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	25	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	26	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	27	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	28	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	29	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	30	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	31	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	32	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	33	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	34	* SUCH DAMAGE.
	35	*/
	36
	37	#if defined(LIBC_SCCS) && !defined(lint)
	38	static char sccsid[] = "@(#)atexit.c 8.2 (Berkeley) 7/3/94";
	39	#endif /* LIBC_SCCS and not lint */
	40	#include <sys/cdefs.h>
	41	__FBSDID("$FreeBSD: src/lib/libc/stdlib/atexit.c,v 1.7 2003/12/19 17:11:20 kan Exp $");
	42
	43	#include "namespace.h"
	44	#include <stddef.h>
	45	#include <stdlib.h>
	46	#include <unistd.h>
	47	#include <pthread.h>
	48	#if defined(__DYNAMIC__)
b5d655f7	49	#include <dlfcn.h>
224c7076 A	50	#endif /* defined(__DYNAMIC__) */
	51	#include "atexit.h"
	52	#include "un-namespace.h"
	53
34e8f829 A	54	#ifdef __BLOCKS__
	55	#include <Block.h>
	56	#endif /* __BLOCKS__ */
224c7076 A	57	#include "libc_private.h"
	58
	59	#define ATEXIT_FN_EMPTY 0
	60	#define ATEXIT_FN_STD 1
	61	#define ATEXIT_FN_CXA 2
34e8f829 A	62	#ifdef __BLOCKS__
	63	#define ATEXIT_FN_BLK 3
	64	#endif /* __BLOCKS__ */
224c7076 A	65
	66	static pthread_mutex_t atexit_mutex = PTHREAD_MUTEX_INITIALIZER;
	67
	68	#define _MUTEX_LOCK(x) if (__isthreaded) _pthread_mutex_lock(x)
	69	#define _MUTEX_UNLOCK(x) if (__isthreaded) _pthread_mutex_unlock(x)
	70
	71	struct atexit {
	72	struct atexit next; / next in list */
	73	int ind; /* next index in this table */
	74	struct atexit_fn {
	75	int fn_type; /* ATEXIT_? from above */
	76	union {
	77	void (*std_func)(void);
	78	void (cxa_func)(void );
34e8f829 A	79	#ifdef __BLOCKS__
	80	void (^block)(void);
	81	#endif /* __BLOCKS__ */
224c7076 A	82	} fn_ptr; /* function pointer */
	83	void fn_arg; / argument for CXA callback */
	84	void fn_dso; / shared module handle */
	85	} fns[ATEXIT_SIZE]; /* the table itself */
	86	};
	87
	88	static struct atexit __atexit; / points to head of LIFO stack */
	89	static int new_registration;
	90
	91	/*
	92	* Register the function described by 'fptr' to be called at application
	93	* exit or owning shared object unload time. This is a helper function
	94	* for atexit and __cxa_atexit.
	95	*/
	96	static int
	97	atexit_register(struct atexit_fn *fptr)
	98	{
	99	static struct atexit __atexit0; /* one guaranteed table */
	100	struct atexit *p;
	101
	102	_MUTEX_LOCK(&atexit_mutex);
	103	if ((p = __atexit) == NULL)
	104	__atexit = p = &__atexit0;
	105	else while (p->ind >= ATEXIT_SIZE) {
	106	struct atexit *old__atexit;
	107	old__atexit = __atexit;
	108	_MUTEX_UNLOCK(&atexit_mutex);
	109	if ((p = (struct atexit )malloc(sizeof(p))) == NULL)
	110	return (-1);
	111	_MUTEX_LOCK(&atexit_mutex);
	112	if (old__atexit != __atexit) {
	113	/* Lost race, retry operation */
	114	_MUTEX_UNLOCK(&atexit_mutex);
	115	free(p);
	116	_MUTEX_LOCK(&atexit_mutex);
	117	p = __atexit;
	118	continue;
	119	}
	120	p->ind = 0;
	121	p->next = __atexit;
	122	__atexit = p;
	123	}
	124	p->fns[p->ind++] = *fptr;
	125	new_registration = 1;
	126	_MUTEX_UNLOCK(&atexit_mutex);
	127	return 0;
	128	}
	129
	130	/*
	131	* Register a function to be performed at exit.
	132	*/
	133	int
	134	atexit(void (*func)(void))
	135	{
	136	struct atexit_fn fn;
b5d655f7	137	struct dl_info info;
224c7076 A	138	int error;
	139
	140	fn.fn_type = ATEXIT_FN_STD;
34e8f829	141	fn.fn_ptr.std_func = func;
224c7076 A	142	fn.fn_arg = NULL;
224c7076 A	143	#if defined(__DYNAMIC__)
b5d655f7 A	144	if ( dladdr(func, &info) )
	145	fn.fn_dso = info.dli_fbase;
	146	else
	147	fn.fn_dso = NULL;
224c7076 A	148	#else /* ! defined(__DYNAMIC__) */
	149	fn.fn_dso = NULL;
	150	#endif /* defined(__DYNAMIC__) */
	151
	152	error = atexit_register(&fn);
	153	return (error);
	154	}
	155
34e8f829 A	156	#ifdef __BLOCKS__
	157	int
	158	atexit_b(void (^block)(void))
	159	{
	160	struct atexit_fn fn;
	161	struct dl_info info;
	162	int error;
	163
	164	fn.fn_type = ATEXIT_FN_BLK;
	165	fn.fn_ptr.block = Block_copy(block);
	166	fn.fn_arg = NULL;
	167	#if defined(__DYNAMIC__)
	168	if ( dladdr(block, &info) )
	169	fn.fn_dso = info.dli_fbase;
	170	else
	171	fn.fn_dso = NULL;
	172	#else /* ! defined(__DYNAMIC__) */
	173	fn.fn_dso = NULL;
	174	#endif /* defined(__DYNAMIC__) */
	175
	176	error = atexit_register(&fn);
	177	return (error);
	178	}
	179	#endif /* __BLOCKS__ */
	180
224c7076 A	181	/*
	182	* Register a function to be performed at exit or when an shared object
	183	* with given dso handle is unloaded dynamically.
	184	*/
	185	int
	186	__cxa_atexit(void (func)(void ), void arg, void dso)
	187	{
	188	struct atexit_fn fn;
	189	int error;
	190
	191	fn.fn_type = ATEXIT_FN_CXA;
	192	fn.fn_ptr.cxa_func = func;;
	193	fn.fn_arg = arg;
	194	fn.fn_dso = dso;
	195
	196	error = atexit_register(&fn);
	197	return (error);
	198	}
	199
	200	/*
	201	* Call all handlers registered with __cxa_atexit for the shared
	202	* object owning 'dso'. Note: if 'dso' is NULL, then all remaining
	203	* handlers are called.
	204	*/
	205	void
	206	__cxa_finalize(const void *dso)
	207	{
	208	struct atexit *p;
	209	struct atexit_fn fn;
	210	int n;
	211
	212	_MUTEX_LOCK(&atexit_mutex);
	213	restart:
	214	for (p = __atexit; p; p = p->next) {
	215	for (n = p->ind; --n >= 0;) {
	216	if (p->fns[n].fn_type == ATEXIT_FN_EMPTY)
	217	continue; /* already been called */
	218	if (dso != NULL && dso != p->fns[n].fn_dso)
	219	continue; /* wrong DSO */
	220	fn = p->fns[n];
	221	/*
	222	Mark entry to indicate that this particular handler
	223	has already been called.
	224	*/
	225	p->fns[n].fn_type = ATEXIT_FN_EMPTY;
	226	new_registration = 0;
	227	_MUTEX_UNLOCK(&atexit_mutex);
	228
	229	/* Call the function of correct type. */
	230	if (fn.fn_type == ATEXIT_FN_CXA)
	231	fn.fn_ptr.cxa_func(fn.fn_arg);
	232	else if (fn.fn_type == ATEXIT_FN_STD)
	233	fn.fn_ptr.std_func();
34e8f829 A	234	#ifdef __BLOCKS__
	235	else if (fn.fn_type == ATEXIT_FN_BLK)
	236	fn.fn_ptr.block();
	237	#endif /* __BLOCKS__ */
224c7076 A	238	_MUTEX_LOCK(&atexit_mutex);
	239	if (new_registration)
	240	goto restart;
	241	}
	242	}
	243	_MUTEX_UNLOCK(&atexit_mutex);
	244	}