--- /dev/null
+/* Copyright (C) 1997-2018 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
+
+/*
+ * ISO C99 7.6: Floating-point environment <fenv.h>
+ */
+
+#ifndef _FENV_H
+#define _FENV_H 1
+
+#define __GLIBC_INTERNAL_STARTING_HEADER_IMPLEMENTATION
+#include <bits/libc-header-start.h>
+
+/* Get the architecture dependend definitions. The following definitions
+ are expected to be done:
+
+ fenv_t type for object representing an entire floating-point
+ environment
+
+ FE_DFL_ENV macro of type pointer to fenv_t to be used as the argument
+ to functions taking an argument of type fenv_t; in this
+ case the default environment will be used
+
+ fexcept_t type for object representing the floating-point exception
+ flags including status associated with the flags
+
+ femode_t type for object representing floating-point control modes
+
+ FE_DFL_MODE macro of type pointer to const femode_t to be used as the
+ argument to fesetmode; in this case the default control
+ modes will be used
+
+ The following macros are defined iff the implementation supports this
+ kind of exception.
+ FE_INEXACT inexact result
+ FE_DIVBYZERO division by zero
+ FE_UNDERFLOW result not representable due to underflow
+ FE_OVERFLOW result not representable due to overflow
+ FE_INVALID invalid operation
+
+ FE_ALL_EXCEPT bitwise OR of all supported exceptions
+
+ The next macros are defined iff the appropriate rounding mode is
+ supported by the implementation.
+ FE_TONEAREST round to nearest
+ FE_UPWARD round toward +Inf
+ FE_DOWNWARD round toward -Inf
+ FE_TOWARDZERO round toward 0
+*/
+#include <bits/fenv.h>
+
+__BEGIN_DECLS
+
+/* Floating-point exception handling. */
+
+/* Clear the supported exceptions represented by EXCEPTS. */
+extern int feclearexcept (int __excepts) __THROW;
+
+/* Store implementation-defined representation of the exception flags
+ indicated by EXCEPTS in the object pointed to by FLAGP. */
+extern int fegetexceptflag (fexcept_t *__flagp, int __excepts) __THROW;
+
+/* Raise the supported exceptions represented by EXCEPTS. */
+extern int feraiseexcept (int __excepts) __THROW;
+
+#if __GLIBC_USE (IEC_60559_BFP_EXT)
+/* Set the supported exception flags represented by EXCEPTS, without
+ causing enabled traps to be taken. */
+extern int fesetexcept (int __excepts) __THROW;
+#endif
+
+/* Set complete status for exceptions indicated by EXCEPTS according to
+ the representation in the object pointed to by FLAGP. */
+extern int fesetexceptflag (const fexcept_t *__flagp, int __excepts) __THROW;
+
+/* Determine which of subset of the exceptions specified by EXCEPTS are
+ currently set. */
+extern int fetestexcept (int __excepts) __THROW;
+
+#if __GLIBC_USE (IEC_60559_BFP_EXT)
+/* Determine which of subset of the exceptions specified by EXCEPTS
+ are set in *FLAGP. */
+extern int fetestexceptflag (const fexcept_t *__flagp, int __excepts) __THROW;
+#endif
+
+
+/* Rounding control. */
+
+/* Get current rounding direction. */
+extern int fegetround (void) __THROW __attribute_pure__;
+
+/* Establish the rounding direction represented by ROUND. */
+extern int fesetround (int __rounding_direction) __THROW;
+
+
+/* Floating-point environment. */
+
+/* Store the current floating-point environment in the object pointed
+ to by ENVP. */
+extern int fegetenv (fenv_t *__envp) __THROW;
+
+/* Save the current environment in the object pointed to by ENVP, clear
+ exception flags and install a non-stop mode (if available) for all
+ exceptions. */
+extern int feholdexcept (fenv_t *__envp) __THROW;
+
+/* Establish the floating-point environment represented by the object
+ pointed to by ENVP. */
+extern int fesetenv (const fenv_t *__envp) __THROW;
+
+/* Save current exceptions in temporary storage, install environment
+ represented by object pointed to by ENVP and raise exceptions
+ according to saved exceptions. */
+extern int feupdateenv (const fenv_t *__envp) __THROW;
+
+
+/* Control modes. */
+
+#if __GLIBC_USE (IEC_60559_BFP_EXT)
+/* Store the current floating-point control modes in the object
+ pointed to by MODEP. */
+extern int fegetmode (femode_t *__modep) __THROW;
+
+/* Establish the floating-point control modes represented by the
+ object pointed to by MODEP. */
+extern int fesetmode (const femode_t *__modep) __THROW;
+#endif
+
+/* Include optimization. */
+#ifdef __OPTIMIZE__
+# include <bits/fenvinline.h>
+#endif
+
+/* NaN support. */
+
+#if (__GLIBC_USE (IEC_60559_BFP_EXT) \
+ && defined FE_INVALID \
+ && defined __SUPPORT_SNAN__)
+# define FE_SNANS_ALWAYS_SIGNAL 1
+#endif
+
+#ifdef __USE_GNU
+
+/* Enable individual exceptions. Will not enable more exceptions than
+ EXCEPTS specifies. Returns the previous enabled exceptions if all
+ exceptions are successfully set, otherwise returns -1. */
+extern int feenableexcept (int __excepts) __THROW;
+
+/* Disable individual exceptions. Will not disable more exceptions than
+ EXCEPTS specifies. Returns the previous enabled exceptions if all
+ exceptions are successfully disabled, otherwise returns -1. */
+extern int fedisableexcept (int __excepts) __THROW;
+
+/* Return enabled exceptions. */
+extern int fegetexcept (void) __THROW;
+#endif
+
+__END_DECLS
+
+#endif /* fenv.h */
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