diff options
Diffstat (limited to 'lib/libc/stdlib/atexit.c')
| -rw-r--r-- | lib/libc/stdlib/atexit.c | 205 |
1 files changed, 0 insertions, 205 deletions
diff --git a/lib/libc/stdlib/atexit.c b/lib/libc/stdlib/atexit.c deleted file mode 100644 index 511172a..0000000 --- a/lib/libc/stdlib/atexit.c +++ /dev/null @@ -1,205 +0,0 @@ -/*- - * 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. - * 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("$FreeBSD$"); - -#include "namespace.h" -#include <link.h> -#include <stddef.h> -#include <stdlib.h> -#include <unistd.h> -#include <pthread.h> -#include "atexit.h" -#include "un-namespace.h" - -#include "libc_private.h" - -#define ATEXIT_FN_EMPTY 0 -#define ATEXIT_FN_STD 1 -#define ATEXIT_FN_CXA 2 - -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) -#define _MUTEX_DESTROY(x) if (__isthreaded) _pthread_mutex_destroy(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 *); - } 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; - - _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; - _MUTEX_UNLOCK(&atexit_mutex); - return 0; -} - -/* - * Register a function to be performed at exit. - */ -int -atexit(void (*func)(void)) -{ - struct atexit_fn fn; - int error; - - fn.fn_type = ATEXIT_FN_STD; - fn.fn_ptr.std_func = func; - fn.fn_arg = NULL; - fn.fn_dso = NULL; - - error = atexit_register(&fn); - return (error); -} - -/* - * 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); -} - -#pragma weak __pthread_cxa_finalize -void __pthread_cxa_finalize(const struct dl_phdr_info *); - -/* - * 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 dl_phdr_info phdr_info; - struct atexit *p; - struct atexit_fn fn; - int n, has_phdr; - - if (dso != NULL) - has_phdr = _rtld_addr_phdr(dso, &phdr_info); - else - has_phdr = 0; - - _MUTEX_LOCK(&atexit_mutex); - 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 */ - fn = p->fns[n]; - if (dso != NULL && dso != fn.fn_dso) { - /* wrong DSO ? */ - if (!has_phdr || !__elf_phdr_match_addr( - &phdr_info, fn.fn_ptr.cxa_func)) - continue; - } - /* - Mark entry to indicate that this particular handler - has already been called. - */ - p->fns[n].fn_type = ATEXIT_FN_EMPTY; - _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(); - _MUTEX_LOCK(&atexit_mutex); - } - } - _MUTEX_UNLOCK(&atexit_mutex); - if (dso == NULL) - _MUTEX_DESTROY(&atexit_mutex); - - if (has_phdr && &__pthread_cxa_finalize != NULL) - __pthread_cxa_finalize(&phdr_info); -} |
