#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)atexit.c 8.2 (Berkeley) 7/3/94";
#endif
#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
#include "atexit.h"
#include "un-namespace.h"
#ifdef __BLOCKS__
#include <Block.h>
#endif
#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
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;
int ind;
struct atexit_fn {
int fn_type;
union {
void (*std_func)(void);
void (*cxa_func)(void *);
#ifdef __BLOCKS__
void (^block)(void);
#endif
} fn_ptr;
void *fn_arg;
void *fn_dso;
} fns[ATEXIT_SIZE];
};
static struct atexit *__atexit;
static int new_registration;
static int
atexit_register(struct atexit_fn *fptr)
{
static struct atexit __atexit0;
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) {
_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;
}
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
fn.fn_dso = NULL;
#endif
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
fn.fn_dso = NULL;
#endif
error = atexit_register(&fn);
return (error);
}
#endif
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);
}
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;
if (dso != NULL && dso != p->fns[n].fn_dso)
continue;
fn = p->fns[n];
p->fns[n].fn_type = ATEXIT_FN_EMPTY;
new_registration = 0;
_MUTEX_UNLOCK(&atexit_mutex);
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
_MUTEX_LOCK(&atexit_mutex);
if (new_registration)
goto restart;
}
}
_MUTEX_UNLOCK(&atexit_mutex);
}