diff --git a/ap/libc/glibc/glibc-2.23/libio/iofwrite.c b/ap/libc/glibc/glibc-2.23/libio/iofwrite.c
new file mode 100644
index 0000000..325ff43
--- /dev/null
+++ b/ap/libc/glibc/glibc-2.23/libio/iofwrite.c
@@ -0,0 +1,60 @@
+/* Copyright (C) 1993-2016 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/>.
+
+   As a special exception, if you link the code in this file with
+   files compiled with a GNU compiler to produce an executable,
+   that does not cause the resulting executable to be covered by
+   the GNU Lesser General Public License.  This exception does not
+   however invalidate any other reasons why the executable file
+   might be covered by the GNU Lesser General Public License.
+   This exception applies to code released by its copyright holders
+   in files containing the exception.  */
+
+#include "libioP.h"
+
+_IO_size_t
+_IO_fwrite (const void *buf, _IO_size_t size, _IO_size_t count, _IO_FILE *fp)
+{
+  _IO_size_t request = size * count;
+  _IO_size_t written = 0;
+  CHECK_FILE (fp, 0);
+  if (request == 0)
+    return 0;
+  _IO_acquire_lock (fp);
+  if (_IO_vtable_offset (fp) != 0 || _IO_fwide (fp, -1) == -1)
+    written = _IO_sputn (fp, (const char *) buf, request);
+  _IO_release_lock (fp);
+  /* We have written all of the input in case the return value indicates
+     this or EOF is returned.  The latter is a special case where we
+     simply did not manage to flush the buffer.  But the data is in the
+     buffer and therefore written as far as fwrite is concerned.  */
+  if (written == request || written == EOF)
+    return count;
+  else
+    return written / size;
+}
+libc_hidden_def (_IO_fwrite)
+
+#ifdef weak_alias
+# include <stdio.h>
+weak_alias (_IO_fwrite, fwrite)
+libc_hidden_weak (fwrite)
+# ifndef _IO_MTSAFE_IO
+weak_alias (_IO_fwrite, fwrite_unlocked)
+libc_hidden_weak (fwrite_unlocked)
+# endif
+#endif