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glibc/math/fenv.h
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/* Copyright (C) 1997-2015 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 | |
<http://www.gnu.org/licenses/>. */ | |
/* | |
* ISO C99 7.6: Floating-point environment <fenv.h> | |
*/ | |
#ifndef _FENV_H | |
#define _FENV_H 1 | |
#include <features.h> | |
/* Get the architecture dependend definitions. The following definitions | |
are expected to be done: | |
fenv_t type for object representing an entire floating-point | |
environment | |
FE_DFL_ENV macro of type pointer to fenv_t to be used as the argument | |
to functions taking an argument of type fenv_t; in this | |
case the default environment will be used | |
fexcept_t type for object representing the floating-point exception | |
flags including status associated with the flags | |
The following macros are defined iff the implementation supports this | |
kind of exception. | |
FE_INEXACT inexact result | |
FE_DIVBYZERO division by zero | |
FE_UNDERFLOW result not representable due to underflow | |
FE_OVERFLOW result not representable due to overflow | |
FE_INVALID invalid operation | |
FE_ALL_EXCEPT bitwise OR of all supported exceptions | |
The next macros are defined iff the appropriate rounding mode is | |
supported by the implementation. | |
FE_TONEAREST round to nearest | |
FE_UPWARD round toward +Inf | |
FE_DOWNWARD round toward -Inf | |
FE_TOWARDZERO round toward 0 | |
*/ | |
#include <bits/fenv.h> | |
__BEGIN_DECLS | |
/* Floating-point exception handling. */ | |
/* Clear the supported exceptions represented by EXCEPTS. */ | |
extern int feclearexcept (int __excepts) __THROW; | |
/* Store implementation-defined representation of the exception flags | |
indicated by EXCEPTS in the object pointed to by FLAGP. */ | |
extern int fegetexceptflag (fexcept_t *__flagp, int __excepts) __THROW; | |
/* Raise the supported exceptions represented by EXCEPTS. */ | |
extern int feraiseexcept (int __excepts) __THROW; | |
/* Set complete status for exceptions indicated by EXCEPTS according to | |
the representation in the object pointed to by FLAGP. */ | |
extern int fesetexceptflag (const fexcept_t *__flagp, int __excepts) __THROW; | |
/* Determine which of subset of the exceptions specified by EXCEPTS are | |
currently set. */ | |
extern int fetestexcept (int __excepts) __THROW; | |
/* Rounding control. */ | |
/* Get current rounding direction. */ | |
extern int fegetround (void) __THROW __attribute_pure__; | |
/* Establish the rounding direction represented by ROUND. */ | |
extern int fesetround (int __rounding_direction) __THROW; | |
/* Floating-point environment. */ | |
/* Store the current floating-point environment in the object pointed | |
to by ENVP. */ | |
extern int fegetenv (fenv_t *__envp) __THROW; | |
/* Save the current environment in the object pointed to by ENVP, clear | |
exception flags and install a non-stop mode (if available) for all | |
exceptions. */ | |
extern int feholdexcept (fenv_t *__envp) __THROW; | |
/* Establish the floating-point environment represented by the object | |
pointed to by ENVP. */ | |
extern int fesetenv (const fenv_t *__envp) __THROW; | |
/* Save current exceptions in temporary storage, install environment | |
represented by object pointed to by ENVP and raise exceptions | |
according to saved exceptions. */ | |
extern int feupdateenv (const fenv_t *__envp) __THROW; | |
/* Include optimization. */ | |
#ifdef __OPTIMIZE__ | |
# include <bits/fenvinline.h> | |
#endif | |
#ifdef __USE_GNU | |
/* Enable individual exceptions. Will not enable more exceptions than | |
EXCEPTS specifies. Returns the previous enabled exceptions if all | |
exceptions are successfully set, otherwise returns -1. */ | |
extern int feenableexcept (int __excepts) __THROW; | |
/* Disable individual exceptions. Will not disable more exceptions than | |
EXCEPTS specifies. Returns the previous enabled exceptions if all | |
exceptions are successfully disabled, otherwise returns -1. */ | |
extern int fedisableexcept (int __excepts) __THROW; | |
/* Return enabled exceptions. */ | |
extern int fegetexcept (void) __THROW; | |
#endif | |
__END_DECLS | |
#endif /* fenv.h */ |