1/* Declarations for SVID math error handling compatibility.
2 Copyright (C) 1991-2023 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19#ifndef _MATH_SVID_COMPAT_H
20#define _MATH_SVID_COMPAT_H 1
21
22/* Support for various different standard error handling behaviors. */
23typedef enum
24{
25 _IEEE_ = -1, /* According to IEEE 754/IEEE 854. */
26 _SVID_, /* According to System V, release 4. */
27 _XOPEN_, /* Nowadays also Unix98. */
28 _POSIX_,
29 _ISOC_ /* Actually this is ISO C99. */
30} _LIB_VERSION_TYPE;
31
32/* This variable can be changed at run-time to any of the values above to
33 affect floating point error handling behavior (it may also be necessary
34 to change the hardware FPU exception settings). */
35extern _LIB_VERSION_TYPE _LIB_VERSION;
36
37/* In SVID error handling, `matherr' is called with this description
38 of the exceptional condition. */
39struct exception
40 {
41 int type;
42 char *name;
43 double arg1;
44 double arg2;
45 double retval;
46 };
47
48extern int matherr (struct exception *__exc);
49extern int __matherr (struct exception *__exc);
50
51#define X_TLOSS 1.41484755040568800000e+16
52#define AS_FLOAT_CONSTANT_1(x) x##f
53#define AS_FLOAT_CONSTANT(x) AS_FLOAT_CONSTANT_1(x)
54
55/* Types of exceptions in the `type' field. */
56#define DOMAIN 1
57#define SING 2
58#define OVERFLOW 3
59#define UNDERFLOW 4
60#define TLOSS 5
61#define PLOSS 6
62
63/* SVID mode specifies returning this large value instead of infinity. */
64#define HUGE 3.40282347e+38F
65
66/* The above definitions may be used in testcases. The following code
67 is only used in the implementation. */
68
69#ifdef _LIBC
70/* fdlibm kernel function */
71extern double __kernel_standard (double, double, int);
72extern float __kernel_standard_f (float, float, int);
73extern long double __kernel_standard_l (long double, long double, int);
74
75# include <shlib-compat.h>
76# define LIBM_SVID_COMPAT SHLIB_COMPAT (libm, GLIBC_2_0, GLIBC_2_27)
77# if LIBM_SVID_COMPAT
78compat_symbol_reference (libm, matherr, matherr, GLIBC_2_0);
79compat_symbol_reference (libm, _LIB_VERSION, _LIB_VERSION, GLIBC_2_0);
80# else
81/* Except when building compat code, optimize out references to
82 _LIB_VERSION and matherr. */
83# define _LIB_VERSION _POSIX_
84# define matherr(EXC) ((void) (EXC), 0)
85# endif
86#endif
87
88#endif /* math-svid-compat.h. */
89