| Current File : //usr/include/fenv.h |
/* Copyright (C) 1997, 1999, 2000, 2012 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;
/* 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 */