diff options
Diffstat (limited to 'stdlib/errno.h')
| -rw-r--r-- | stdlib/errno.h | 62 |
1 files changed, 25 insertions, 37 deletions
diff --git a/stdlib/errno.h b/stdlib/errno.h index c42514b448..fe08365e40 100644 --- a/stdlib/errno.h +++ b/stdlib/errno.h @@ -20,53 +20,41 @@ */ #ifndef _ERRNO_H +#define _ERRNO_H 1 -/* The includer defined __need_Emath if he wants only the definitions - of EDOM and ERANGE, and not everything else. */ -#ifndef __need_Emath -# define _ERRNO_H 1 -# include <features.h> -#endif +#include <features.h> -__BEGIN_DECLS - -/* Get the error number constants from the system-specific file. - This file will test __need_Emath and _ERRNO_H. */ +/* The system-specific definitions of the E* constants, as macros. */ #include <bits/errno.h> -#undef __need_Emath -#ifdef _ERRNO_H +/* When included from assembly language, this header only provides the + E* constants. */ +#ifndef __ASSEMBLER__ -/* Declare the `errno' variable, unless it's defined as a macro by - bits/errno.h. This is the case in GNU, where it is a per-thread - variable. This redeclaration using the macro still works, but it - will be a function declaration without a prototype and may trigger - a -Wstrict-prototypes warning. */ -#ifndef errno -extern int errno; -#endif +__BEGIN_DECLS -#ifdef __USE_GNU +/* 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, *program_invocation_short_name; -#endif /* __USE_GNU */ -#endif /* _ERRNO_H */ +extern char *program_invocation_name; +extern char *program_invocation_short_name; -__END_DECLS +/* bits/errno.h may have defined this type. If it didn't, provide a + fallback definition. */ +# ifndef __error_t_defined +# define __error_t_defined 1 +typedef int error_t; +# endif -#endif /* _ERRNO_H */ +# endif /* __USE_GNU */ -/* The Hurd <bits/errno.h> defines `error_t' as an enumerated type so - that printing `error_t' values in the debugger shows the names. We - might need this definition sometimes even if this file was included - before. */ -#if defined __USE_GNU || defined __need_error_t -# ifndef __error_t_defined -typedef int error_t; -# define __error_t_defined 1 -# endif -# undef __need_error_t -#endif +__END_DECLS + +#endif /* !__ASSEMBLER__ */ +#endif /* errno.h */ |