1 /* Copyright (C) 1997-2022 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 64