[Feature][ZXW-33]merge ZXW 0428 version
Change-Id: I11f167edfea428d9fab198ff00ff1364932d1b0b
diff --git a/ap/libc/glibc/glibc-2.23/stdlib/cxa_atexit.c b/ap/libc/glibc/glibc-2.23/stdlib/cxa_atexit.c
new file mode 100644
index 0000000..61c6e51
--- /dev/null
+++ b/ap/libc/glibc/glibc-2.23/stdlib/cxa_atexit.c
@@ -0,0 +1,133 @@
+/* Copyright (C) 1999-2016 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
+
+#include <assert.h>
+#include <stdlib.h>
+#include <stdint.h>
+
+#include <libc-lock.h>
+#include "exit.h"
+#include <atomic.h>
+#include <sysdep.h>
+
+#undef __cxa_atexit
+
+
+int
+attribute_hidden
+__internal_atexit (void (*func) (void *), void *arg, void *d,
+ struct exit_function_list **listp)
+{
+ struct exit_function *new = __new_exitfn (listp);
+
+ if (new == NULL)
+ return -1;
+
+#ifdef PTR_MANGLE
+ PTR_MANGLE (func);
+#endif
+ new->func.cxa.fn = (void (*) (void *, int)) func;
+ new->func.cxa.arg = arg;
+ new->func.cxa.dso_handle = d;
+ atomic_write_barrier ();
+ new->flavor = ef_cxa;
+ return 0;
+}
+
+
+/* Register a function to be called by exit or when a shared library
+ is unloaded. This function is only called from code generated by
+ the C++ compiler. */
+int
+__cxa_atexit (void (*func) (void *), void *arg, void *d)
+{
+ return __internal_atexit (func, arg, d, &__exit_funcs);
+}
+libc_hidden_def (__cxa_atexit)
+
+
+/* We change global data, so we need locking. */
+__libc_lock_define_initialized (static, lock)
+
+
+static struct exit_function_list initial;
+struct exit_function_list *__exit_funcs = &initial;
+uint64_t __new_exitfn_called;
+
+struct exit_function *
+__new_exitfn (struct exit_function_list **listp)
+{
+ struct exit_function_list *p = NULL;
+ struct exit_function_list *l;
+ struct exit_function *r = NULL;
+ size_t i = 0;
+
+ __libc_lock_lock (lock);
+
+ for (l = *listp; l != NULL; p = l, l = l->next)
+ {
+ for (i = l->idx; i > 0; --i)
+ if (l->fns[i - 1].flavor != ef_free)
+ break;
+
+ if (i > 0)
+ break;
+
+ /* This block is completely unused. */
+ l->idx = 0;
+ }
+
+ if (l == NULL || i == sizeof (l->fns) / sizeof (l->fns[0]))
+ {
+ /* The last entry in a block is used. Use the first entry in
+ the previous block if it exists. Otherwise create a new one. */
+ if (p == NULL)
+ {
+ assert (l != NULL);
+ p = (struct exit_function_list *)
+ calloc (1, sizeof (struct exit_function_list));
+ if (p != NULL)
+ {
+ p->next = *listp;
+ *listp = p;
+ }
+ }
+
+ if (p != NULL)
+ {
+ r = &p->fns[0];
+ p->idx = 1;
+ }
+ }
+ else
+ {
+ /* There is more room in the block. */
+ r = &l->fns[i];
+ l->idx = i + 1;
+ }
+
+ /* Mark entry as used, but we don't know the flavor now. */
+ if (r != NULL)
+ {
+ r->flavor = ef_us;
+ ++__new_exitfn_called;
+ }
+
+ __libc_lock_unlock (lock);
+
+ return r;
+}