1 /* Declarations for SVID math error handling compatibility. 2 Copyright (C) 1991-2022 Free Software Foundation, Inc. 3 This file is part of the GNU C Library. 4 5 The GNU C Library is free software; you can redistribute it and/or 6 modify it under the terms of the GNU Lesser General Public 7 License as published by the Free Software Foundation; either 8 version 2.1 of the License, or (at your option) any later version. 9 10 The GNU C Library is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 Lesser General Public License for more details. 14 15 You should have received a copy of the GNU Lesser General Public 16 License along with the GNU C Library; if not, see 17 <https://www.gnu.org/licenses/>. */ 18 19 #ifndef _MATH_SVID_COMPAT_H 20 #define _MATH_SVID_COMPAT_H 1 21 22 /* Support for various different standard error handling behaviors. */ 23 typedef enum 24 { 25 _IEEE_ = -1, /* According to IEEE 754/IEEE 854. */ 26 _SVID_, /* According to System V, release 4. */ 27 _XOPEN_, /* Nowadays also Unix98. */ 28 _POSIX_, 29 _ISOC_ /* Actually this is ISO C99. */ 30 } _LIB_VERSION_TYPE; 31 32 /* This variable can be changed at run-time to any of the values above to 33 affect floating point error handling behavior (it may also be necessary 34 to change the hardware FPU exception settings). */ 35 extern _LIB_VERSION_TYPE _LIB_VERSION; 36 37 /* In SVID error handling, `matherr' is called with this description 38 of the exceptional condition. */ 39 struct exception 40 { 41 int type; 42 char *name; 43 double arg1; 44 double arg2; 45 double retval; 46 }; 47 48 extern int matherr (struct exception *__exc); 49 extern int __matherr (struct exception *__exc); 50 51 #define X_TLOSS 1.41484755040568800000e+16 52 #define AS_FLOAT_CONSTANT_1(x) x##f 53 #define AS_FLOAT_CONSTANT(x) AS_FLOAT_CONSTANT_1(x) 54 55 /* Types of exceptions in the `type' field. */ 56 #define DOMAIN 1 57 #define SING 2 58 #define OVERFLOW 3 59 #define UNDERFLOW 4 60 #define TLOSS 5 61 #define PLOSS 6 62 63 /* SVID mode specifies returning this large value instead of infinity. */ 64 #define HUGE 3.40282347e+38F 65 66 /* The above definitions may be used in testcases. The following code 67 is only used in the implementation. */ 68 69 #ifdef _LIBC 70 /* fdlibm kernel function */ 71 extern double __kernel_standard (double, double, int); 72 extern float __kernel_standard_f (float, float, int); 73 extern long double __kernel_standard_l (long double, long double, int); 74 75 # include <shlib-compat.h> 76 # define LIBM_SVID_COMPAT SHLIB_COMPAT (libm, GLIBC_2_0, GLIBC_2_27) 77 # if LIBM_SVID_COMPAT 78 compat_symbol_reference (libm, matherr, matherr, GLIBC_2_0); 79 compat_symbol_reference (libm, _LIB_VERSION, _LIB_VERSION, GLIBC_2_0); 80 # else 81 /* Except when building compat code, optimize out references to 82 _LIB_VERSION and matherr. */ 83 # define _LIB_VERSION _POSIX_ 84 # define matherr(EXC) ((void) (EXC), 0) 85 # endif 86 #endif 87 88 #endif /* math-svid-compat.h. */ 89