1  /* Copyright (C) 1997-2023 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     <https://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)
      56  
      57  #if __GLIBC_USE (IEC_60559_BFP_EXT_C2X)
      58  /* Type representing floating-point control modes.  */
      59  typedef unsigned int femode_t;
      60  
      61  /* Default floating-point control modes.  */
      62  # define FE_DFL_MODE	((const femode_t *) -1L)
      63  #endif