| 2ee739cc |
1 | #pragma force_top_level |
| 2 | #pragma include_only_once |
| 3 | |
| 4 | /* errno.h: ANSI 'C' (X3J11 Oct 88) library header, section 4.1.3 */ |
| 5 | /* Copyright (C) Codemist Ltd. */ |
| 6 | /* Copyright (C) Acorn Computers Ltd. 1991, 1992 */ |
| 7 | /* version 2.00 */ |
| 8 | |
| 9 | #ifndef __errno_h |
| 10 | #define __errno_h |
| 11 | |
| 12 | #ifndef errno |
| 13 | #ifdef __cplusplus |
| 14 | extern "C" { |
| 15 | #define _VOLATILE |
| 16 | #else |
| 17 | #define _VOLATILE volatile |
| 18 | #endif |
| 19 | |
| 20 | #ifdef SYSTEM_STATICS |
| 21 | extern _VOLATILE int *__errno; |
| 22 | #define errno *__errno |
| 23 | #elif defined(_DLL) |
| 24 | extern int *_dll_errno(void); |
| 25 | #define errno (*_dll_errno()) |
| 26 | #else |
| 27 | extern _VOLATILE int __errno; |
| 28 | #define errno __errno |
| 29 | #endif |
| 30 | |
| 31 | #ifdef __cplusplus |
| 32 | } |
| 33 | #endif |
| 34 | |
| 35 | #undef _VOLATILE |
| 36 | |
| 37 | #endif |
| 38 | |
| 39 | /* |
| 40 | * expands to a modifiable lvalue that has type volatile int, the value of |
| 41 | * which is set to a positive error code by several library functions. It is |
| 42 | * initialised to zero at program startup, but is never set to zero by any |
| 43 | * library function. The value of errno may be set to nonzero by a library |
| 44 | * function call whether or not there is an error, provided the use of errno |
| 45 | * is not documented in the description of the function in the Standard. |
| 46 | */ |
| 47 | |
| 48 | #define EDOM 1 |
| 49 | /* |
| 50 | * if a domain error occurs (an input argument is outside the domain over |
| 51 | * which the mathematical function is defined) the integer expression errno |
| 52 | * acquires the value of the macro EDOM and HUGE_VAL is returned. EDOM may |
| 53 | * be used by non-mathematical functions. |
| 54 | */ |
| 55 | #define ERANGE 2 |
| 56 | /* |
| 57 | * a range error occurs if the result of a function can not be represented |
| 58 | * as a double value. If the result overflows (the magnitude of the result |
| 59 | * is so large that it cannot be represented in an object of the specified |
| 60 | * type), the function returns the value of the macro HUGE_VAL, with the |
| 61 | * same sign as the correct value of the function; the integer expression |
| 62 | * errno acquires the value of the macro ERANGE. If the result underflows |
| 63 | * (the magnitude of the result is so small that it cannot be represented |
| 64 | * in an object of the specified type), the function returns zero; the |
| 65 | * integer expression errno acquires the value of the macro ERANGE. ERANGE |
| 66 | * may be used by non-mathematical functions. |
| 67 | */ |
| 68 | #define ESIGNUM 3 |
| 69 | |
| 70 | #endif |
| 71 | |
| 72 | /* end of errno.h */ |
~mdw / ssr / blame