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📄 confname.h(23.15 KB)
📄 cpu-set.h(4.41 KB)
📄 dirent.h(1.73 KB)
📄 dlfcn.h(2.46 KB)
📄 elfclass.h(426 B)
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📄 environments.h(3.7 KB)
📄 epoll.h(1.04 KB)
📄 errno.h(1.39 KB)
📄 error.h(2.62 KB)
📄 eventfd.h(1.1 KB)
📄 fcntl-linux.h(13.39 KB)
📄 fcntl.h(2.19 KB)
📄 fcntl2.h(5.44 KB)
📄 fenv.h(4.5 KB)
📄 fenvinline.h(190 B)
📄 floatn-common.h(9.54 KB)
📄 floatn.h(4.27 KB)
📄 flt-eval-method.h(1.19 KB)
📄 fp-fast.h(1.19 KB)
📄 fp-logb.h(1011 B)
📄 getopt_core.h(3.58 KB)
📄 getopt_ext.h(2.97 KB)
📄 getopt_posix.h(1.77 KB)
📄 hwcap.h(971 B)
📄 in.h(9.24 KB)
📄 indirect-return.h(1.55 KB)
📄 initspin.h(25 B)
📄 inotify.h(1.05 KB)
📄 ioctl-types.h(2.4 KB)
📄 ioctls.h(4.37 KB)
📄 ipc.h(2.02 KB)
📄 ipctypes.h(1.15 KB)
📄 iscanonical.h(2.42 KB)
📄 libc-header-start.h(2.55 KB)
📄 libm-simd-decl-stubs.h(2.93 KB)
📄 link.h(4.18 KB)
📄 link_lavcurrent.h(1.07 KB)
📄 local_lim.h(3.11 KB)
📄 locale.h(1.33 KB)
📄 long-double.h(923 B)
📄 math-finite.h(5.25 KB)
📄 math-vector.h(2.25 KB)
📄 mathcalls-helper-functions.h(1.72 KB)
📄 mathcalls-narrow.h(1.28 KB)
📄 mathcalls.h(12.79 KB)
📄 mathdef.h(890 B)
📄 mathinline.h(12.71 KB)
📄 mman-linux.h(4.78 KB)
📄 mman-shared.h(2.67 KB)
📄 mman.h(2.01 KB)
📄 monetary-ldbl.h(1.02 KB)
📄 mqueue.h(1.22 KB)
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📄 msq.h(2.58 KB)
📄 netdb.h(1.23 KB)
📄 param.h(1.4 KB)
📄 poll.h(2.03 KB)
📄 poll2.h(2.43 KB)
📄 posix1_lim.h(5.07 KB)
📄 posix2_lim.h(2.8 KB)
📄 posix_opt.h(5.63 KB)
📄 printf-ldbl.h(991 B)
📄 pthreadtypes-arch.h(3.21 KB)
📄 pthreadtypes.h(3 KB)
📄 ptrace-shared.h(2.83 KB)
📄 resource.h(6.15 KB)
📄 sched.h(3.66 KB)
📄 select.h(2.06 KB)
📄 select2.h(1.4 KB)
📄 sem.h(2.56 KB)
📄 semaphore.h(1.21 KB)
📄 setjmp.h(1.26 KB)
📄 setjmp2.h(1.66 KB)
📄 shm.h(3.51 KB)
📄 sigaction.h(2.87 KB)
📄 sigcontext.h(4.16 KB)
📄 sigevent-consts.h(1.44 KB)
📄 siginfo-arch.h(729 B)
📄 siginfo-consts-arch.h(204 B)
📄 siginfo-consts.h(5.83 KB)
📄 signalfd.h(1.04 KB)
📄 signum-generic.h(4.24 KB)
📄 signum.h(1.59 KB)
📄 sigstack.h(1.14 KB)
📄 sigthread.h(1.65 KB)
📄 sockaddr.h(1.48 KB)
📄 socket.h(15.2 KB)
📄 socket2.h(2.96 KB)
📄 socket_type.h(2.16 KB)
📄 ss_flags.h(1.16 KB)
📄 stab.def(8.83 KB)
📄 stat.h(7.44 KB)
📄 statfs.h(1.87 KB)
📄 statvfs.h(3.34 KB)
📄 statx-generic.h(2 KB)
📄 statx.h(1.37 KB)
📄 stdint-intn.h(1.01 KB)
📄 stdint-uintn.h(1.02 KB)
📄 stdio-ldbl.h(2.94 KB)
📄 stdio.h(5.46 KB)
📄 stdio2.h(12.25 KB)
📄 stdio_lim.h(1.18 KB)
📄 stdlib-bsearch.h(1.34 KB)
📄 stdlib-float.h(1.09 KB)
📄 stdlib-ldbl.h(1.34 KB)
📄 stdlib.h(4.95 KB)
📄 string_fortified.h(4.57 KB)
📄 strings_fortified.h(1.21 KB)
📄 sys_errlist.h(1.19 KB)
📄 syscall.h(44.59 KB)
📄 sysctl.h(898 B)
📄 syslog-ldbl.h(1.18 KB)
📄 syslog-path.h(1.04 KB)
📄 syslog.h(1.64 KB)
📄 sysmacros.h(2.88 KB)
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📄 thread-shared-types.h(6.58 KB)
📄 time.h(2.93 KB)
📄 timerfd.h(1.08 KB)
📄 timex.h(4.49 KB)
📁 types
📄 types.h(8.14 KB)
📄 typesizes.h(3.32 KB)
📄 uintn-identity.h(1.5 KB)
📄 uio-ext.h(1.88 KB)
📄 uio_lim.h(1.35 KB)
📄 unistd.h(10.56 KB)
📄 utmp.h(3.97 KB)
📄 utmpx.h(3.49 KB)
📄 utsname.h(1.18 KB)
📄 waitflags.h(1.66 KB)
📄 waitstatus.h(2.23 KB)
📄 wchar-ldbl.h(2.37 KB)
📄 wchar.h(1.86 KB)
📄 wchar2.h(17.79 KB)
📄 wctype-wchar.h(6.15 KB)
📄 wordsize.h(442 B)
📄 xopen_lim.h(3.77 KB)

Editing: fenv.h

/* 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/>.  */

#ifndef _FENV_H
# error "Never use <bits/fenv.h> directly; include <fenv.h> instead."
#endif

/* Define bits representing the exception.  We use the bit positions
   of the appropriate bits in the FPU control word.  */
enum
  {
    FE_INVALID =
#define FE_INVALID	0x01
      FE_INVALID,
    __FE_DENORM = 0x02,
    FE_DIVBYZERO =
#define FE_DIVBYZERO	0x04
      FE_DIVBYZERO,
    FE_OVERFLOW =
#define FE_OVERFLOW	0x08
      FE_OVERFLOW,
    FE_UNDERFLOW =
#define FE_UNDERFLOW	0x10
      FE_UNDERFLOW,
    FE_INEXACT =
#define FE_INEXACT	0x20
      FE_INEXACT
  };

#define FE_ALL_EXCEPT \
	(FE_INEXACT | FE_DIVBYZERO | FE_UNDERFLOW | FE_OVERFLOW | FE_INVALID)

/* The ix87 FPU supports all of the four defined rounding modes.  We
   use again the bit positions in the FPU control word as the values
   for the appropriate macros.  */
enum
  {
    FE_TONEAREST =
#define FE_TONEAREST	0
      FE_TONEAREST,
    FE_DOWNWARD =
#define FE_DOWNWARD	0x400
      FE_DOWNWARD,
    FE_UPWARD =
#define FE_UPWARD	0x800
      FE_UPWARD,
    FE_TOWARDZERO =
#define FE_TOWARDZERO	0xc00
      FE_TOWARDZERO
  };

/* Type representing exception flags.  */
typedef unsigned short int fexcept_t;

/* Type representing floating-point environment.  This structure
   corresponds to the layout of the block written by the `fstenv'
   instruction and has additional fields for the contents of the MXCSR
   register as written by the `stmxcsr' instruction.  */
typedef struct
  {
    unsigned short int __control_word;
    unsigned short int __glibc_reserved1;
    unsigned short int __status_word;
    unsigned short int __glibc_reserved2;
    unsigned short int __tags;
    unsigned short int __glibc_reserved3;
    unsigned int __eip;
    unsigned short int __cs_selector;
    unsigned int __opcode:11;
    unsigned int __glibc_reserved4:5;
    unsigned int __data_offset;
    unsigned short int __data_selector;
    unsigned short int __glibc_reserved5;
#ifdef __x86_64__
    unsigned int __mxcsr;
#endif
  }
fenv_t;

/* If the default argument is used we use this value.  */
#define FE_DFL_ENV	((const fenv_t *) -1)

#ifdef __USE_GNU
/* Floating-point environment where none of the exception is masked.  */
# define FE_NOMASK_ENV	((const fenv_t *) -2)
#endif

#if __GLIBC_USE (IEC_60559_BFP_EXT)
/* Type representing floating-point control modes.  */
typedef struct
  {
    unsigned short int __control_word;
    unsigned short int __glibc_reserved;
    unsigned int __mxcsr;
  }
femode_t;

/* Default floating-point control modes.  */
# define FE_DFL_MODE	((const femode_t *) -1L)
#endif

#ifdef __USE_EXTERN_INLINES
__BEGIN_DECLS

/* Optimized versions.  */
#ifndef _LIBC
extern int __REDIRECT_NTH (__feraiseexcept_renamed, (int), feraiseexcept);
#endif
__extern_always_inline void
__NTH (__feraiseexcept_invalid_divbyzero (int __excepts))
{
  if ((FE_INVALID & __excepts) != 0)
    {
      /* One example of an invalid operation is 0.0 / 0.0.  */
      float __f = 0.0;

# ifdef __SSE_MATH__
      __asm__ __volatile__ ("divss %0, %0 " : "+x" (__f));
# else
      __asm__ __volatile__ ("fdiv %%st, %%st(0); fwait"
			    : "=t" (__f) : "0" (__f));
# endif
      (void) &__f;
    }
  if ((FE_DIVBYZERO & __excepts) != 0)
    {
      float __f = 1.0;
      float __g = 0.0;

# ifdef __SSE_MATH__
      __asm__ __volatile__ ("divss %1, %0" : "+x" (__f) : "x" (__g));
# else
      __asm__ __volatile__ ("fdivp %%st, %%st(1); fwait"
			    : "=t" (__f) : "0" (__f), "u" (__g) : "st(1)");
# endif
      (void) &__f;
    }
}
__extern_inline int
__NTH (feraiseexcept (int __excepts))
{
  if (__builtin_constant_p (__excepts)
      && (__excepts & ~(FE_INVALID | FE_DIVBYZERO)) == 0)
    {
      __feraiseexcept_invalid_divbyzero (__excepts);
      return 0;
    }

return __feraiseexcept_renamed (__excepts);
}

__END_DECLS
#endif

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Editing: fenv.h

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