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Filename : errno.h
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/* 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 */