bits/fenv.h

   1 /* Copyright (C) 1997, 1998, 1999, 2000, 2001 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, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #ifndef _FENV_H
  20 # error "Never use <bits/fenv.h> directly; include <fenv.h> instead."
  21 #endif
  22
  23
  24 /* Here should be the exception be defined:
  25     FE_INVALID
  26     FE_DIVBYZERO
  27     FE_OVERFLOW
  28     FE_UNDERFLOW
  29     FE_INEXACT
  30    We define no macro which signals no exception is supported.  */
  31
  32 #define FE_ALL_EXCEPT 0
  33
  34
  35 /* Here should the rounding modes be defined:
  36     FE_TONEAREST
  37     FE_DOWNWARD
  38     FE_UPWARD
  39     FE_TOWARDZERO
  40    We define no macro which signals no rounding mode is selectable.  */
  41
  42
  43 /* Type representing exception flags.  */
  44 typedef unsigned int fexcept_t;
  45
  46
  47 /* Type representing floating-point environment.  */
  48 typedef struct
  49   {
  50     fexcept_t __excepts;
  51     /* XXX I don't know what else we should save.  */
  52   }
  53 fenv_t;
  54
  55 /* If the default argument is used we use this value.  */
  56 #define FE_DFL_ENV      ((__const fenv_t *) -1l)