[Feature][ZXW-33]merge ZXW 0428 version
Change-Id: I11f167edfea428d9fab198ff00ff1364932d1b0b
diff --git a/ap/libc/glibc/glibc-2.23/io/linkat.c b/ap/libc/glibc/glibc-2.23/io/linkat.c
new file mode 100644
index 0000000..8db993d
--- /dev/null
+++ b/ap/libc/glibc/glibc-2.23/io/linkat.c
@@ -0,0 +1,44 @@
+/* Copyright (C) 2005-2016 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 <errno.h>
+#include <fcntl.h>
+#include <stddef.h>
+#include <unistd.h>
+
+
+/* Make a link to FROM relative to FROMFD called TO relative to TOFD. */
+int
+linkat (int fromfd, const char *from, int tofd, const char *to, int flags)
+{
+ if (from == NULL || to == NULL)
+ {
+ __set_errno (EINVAL);
+ return -1;
+ }
+
+ if ((tofd != AT_FDCWD && tofd < 0 && *to != '/')
+ || (fromfd != AT_FDCWD && fromfd < 0 && *from != '/'))
+ {
+ __set_errno (EBADF);
+ return -1;
+ }
+
+ __set_errno (ENOSYS);
+ return -1;
+}
+stub_warning (linkat)