/* Error constants. Generic version. 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 . */ /* This file defines the errno constants. */ #ifndef _BITS_ERRNO_H #define _BITS_ERRNO_H 1 #if !defined _ERRNO_H # error "Never include directly; use instead." #endif #error "Generic bits/errno.h included -- port is incomplete." /* Authors of new ports of the GNU C Library must override this file with their own bits/errno.h in an appropriate subdirectory of sysdeps/. Its function is to define all of the error constants from C2011 and POSIX.1-2008, with values appropriate to the operating system, and any additional OS-specific error constants. C2011 requires all error constants to be object-like macros that expand to "integer constant expressions with type int, positive values, and suitable for use in #if directives". Moreover, all of their names must begin with a capital E, followed immediately by either another capital letter, or a digit. It is OK to define macros that are not error constants, but only in the implementation namespace. errno.h is sometimes included from assembly language. Therefore, when __ASSEMBLER__ is defined, bits/errno.h may only define macros; it may not make any other kind of C declaration or definition. Also, the error constants should, if at all possible, expand to simple decimal or hexadecimal numbers. */ #endif /* bits/errno.h. */