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/* Declarations for SVID math error handling compatibility.
Copyright (C) 1991-2020 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
<https://www.gnu.org/licenses/>. */
#ifndef _MATH_SVID_COMPAT_H
#define _MATH_SVID_COMPAT_H 1
/* Support for various different standard error handling behaviors. */
typedef enum
{
_IEEE_ = -1, /* According to IEEE 754/IEEE 854. */
_SVID_, /* According to System V, release 4. */
_XOPEN_, /* Nowadays also Unix98. */
_POSIX_,
_ISOC_ /* Actually this is ISO C99. */
} _LIB_VERSION_TYPE;
/* This variable can be changed at run-time to any of the values above to
affect floating point error handling behavior (it may also be necessary
to change the hardware FPU exception settings). */
extern _LIB_VERSION_TYPE _LIB_VERSION;
/* In SVID error handling, `matherr' is called with this description
of the exceptional condition. */
struct exception
{
int type;
char *name;
double arg1;
double arg2;
double retval;
};
extern int matherr (struct exception *__exc);
extern int __matherr (struct exception *__exc);
#define X_TLOSS 1.41484755040568800000e+16
/* Types of exceptions in the `type' field. */
#define DOMAIN 1
#define SING 2
#define OVERFLOW 3
#define UNDERFLOW 4
#define TLOSS 5
#define PLOSS 6
/* SVID mode specifies returning this large value instead of infinity. */
#define HUGE 3.40282347e+38F
/* The above definitions may be used in testcases. The following code
is only used in the implementation. */
#ifdef _LIBC
/* fdlibm kernel function */
extern double __kernel_standard (double, double, int);
extern float __kernel_standard_f (float, float, int);
extern long double __kernel_standard_l (long double, long double, int);
# include <shlib-compat.h>
# define LIBM_SVID_COMPAT SHLIB_COMPAT (libm, GLIBC_2_0, GLIBC_2_27)
# if LIBM_SVID_COMPAT
compat_symbol_reference (libm, matherr, matherr, GLIBC_2_0);
compat_symbol_reference (libm, _LIB_VERSION, _LIB_VERSION, GLIBC_2_0);
# else
/* Except when building compat code, optimize out references to
_LIB_VERSION and matherr. */
# define _LIB_VERSION _POSIX_
# define matherr(EXC) ((void) (EXC), 0)
# endif
#endif
#endif /* math-svid-compat.h. */
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