* 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.
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 1.6 2002/03/22 21:53:09 obrien Exp $");
+__FBSDID("$FreeBSD: src/lib/libc/stdlib/atexit.c,v 1.8 2007/01/09 00:28:09 imp Exp $");
#include "namespace.h"
#include <stddef.h>
#include <stdlib.h>
#include <unistd.h>
#include <pthread.h>
+#if defined(__DYNAMIC__) || defined (__BLOCKS__)
+#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 *__atexit; /* points to head of LIFO stack */
+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 a function to be performed at exit.
+ * 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.
*/
-int
-atexit(fn)
- void (*fn)();
+static int
+atexit_register(struct atexit_fn *fptr)
{
static struct atexit __atexit0; /* one guaranteed table */
struct atexit *p;
p->next = __atexit;
__atexit = p;
}
- p->fns[p->ind++] = fn;
+ 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);
- return (0);
}
projects / apple / libc.git / blobdiff