--- /dev/null
+/* Copyright (C) 1991-2018 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/>. */
+
+/*
+ * ISO C99 Standard: 7.5 Errors <errno.h>
+ */
+
+#ifndef _ERRNO_H
+#define _ERRNO_H 1
+
+#include <features.h>
+
+/* The system-specific definitions of the E* constants, as macros. */
+#include <bits/errno.h>
+
+/* When included from assembly language, this header only provides the
+ E* constants. */
+#ifndef __ASSEMBLER__
+
+__BEGIN_DECLS
+
+/* The error code set by various library functions. */
+extern int *__errno_location (void) __THROW __attribute_const__;
+# define errno (*__errno_location ())
+
+# ifdef __USE_GNU
+
+/* The full and simple forms of the name with which the program was
+ invoked. These variables are set up automatically at startup based on
+ the value of argv[0]. */
+extern char *program_invocation_name;
+extern char *program_invocation_short_name;
+
+#include <bits/types/error_t.h>
+
+# endif /* __USE_GNU */
+
+__END_DECLS
+
+#endif /* !__ASSEMBLER__ */
+#endif /* errno.h */