bits/fenv.h

   1 /* Copyright (C) 1997-2015 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #ifndef _FENV_H
  19 # error "Never use <bits/fenv.h> directly; include <fenv.h> instead."
  20 #endif
  21
  22
  23 /* Here should be the exception be defined:
  24     FE_INVALID
  25     FE_DIVBYZERO
  26     FE_OVERFLOW
  27     FE_UNDERFLOW
  28     FE_INEXACT
  29    We define no macro which signals no exception is supported.  */
  30
  31 #define FE_ALL_EXCEPT 0
  32
  33
  34 /* Here should the rounding modes be defined:
  35     FE_TONEAREST
  36     FE_DOWNWARD
  37     FE_UPWARD
  38     FE_TOWARDZERO
  39    We define no macro which signals no rounding mode is selectable.  */
  40
  41
  42 /* Type representing exception flags.  */
  43 typedef unsigned int fexcept_t;
  44
  45
  46 /* Type representing floating-point environment.  */
  47 typedef struct
  48   {
  49     fexcept_t __excepts;
  50     /* XXX I don't know what else we should save.  */
  51   }
  52 fenv_t;
  53
  54 /* If the default argument is used we use this value.  */
  55 #define FE_DFL_ENV      ((const fenv_t *) -1l)