bits/fenv.h

   1 /* Copyright (C) 1997 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 Library General Public License as
   6    published by the Free Software Foundation; either version 2 of the
   7    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    Library General Public License for more details.
  13
  14    You should have received a copy of the GNU Library General Public
  15    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  16    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17    Boston, MA 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_TOWARDSZERO
  40    We define no macro which signals no rounding mode is selectable.  */
  41
  42
  43 /* Type representing exception flags.
  44    XXX Probably we should also include the signal handler here.  */
  45 typedef struct
  46   {
  47     unsigned int flags;
  48   }
  49 fexcept_t;
  50
  51
  52 /* Type representing floating-point environment.  */
  53 typedef struct
  54   {
  55     fexcept_t excepts;
  56     /* XXX I don't know what else we should save.  */
  57   }
  58 fenv_t;
  59
  60 /* If the default argument is used we use this value.  */
  61 #define FE_DFL_ENV      ((fenv_t *) -1l)