golden hour

/usr/include/bits

File/Folder	Size	Actions
a.out.h	268 B
byteswap-16.h	1.69 KB
byteswap.h	5.56 KB
cmathcalls.h	4.7 KB
confname.h	23.19 KB
dirent.h	1.69 KB
dlfcn.h	2.47 KB
elfclass.h	426 B
endian.h	176 B
environments.h	3.5 KB
epoll.h	1.11 KB
errno.h	2.11 KB
error.h	2.62 KB
eventfd.h	1.1 KB
fcntl-linux.h	12.55 KB
fcntl.h	2.19 KB
fcntl2.h	5.44 KB
fenv.h	3.94 KB
fenvinline.h	190 B
huge_val.h	1.83 KB
huge_valf.h	1.79 KB
huge_vall.h	1.57 KB
hwcap.h	966 B
in.h	9.01 KB
inf.h	1.03 KB
initspin.h	25 B
inotify.h	1.05 KB
ioctl-types.h	2.41 KB
ioctls.h	4.38 KB
ipc.h	2.01 KB
ipctypes.h	1.14 KB
libc-lock.h	12.54 KB
libio-ldbl.h	1014 B
link.h	4.2 KB
local_lim.h	3.13 KB
locale.h	1.33 KB
math-finite.h	14.24 KB
mathcalls.h	11.3 KB
mathdef.h	2.14 KB
mathinline.h	30.86 KB
mman.h	4.78 KB
monetary-ldbl.h	1.02 KB
mqueue.h	1.22 KB
mqueue2.h	2.11 KB
msq.h	2.47 KB
nan.h	1.54 KB
netdb.h	1.25 KB
param.h	1.4 KB
poll.h	2.04 KB
poll2.h	2.86 KB
posix1_lim.h	4.81 KB
posix2_lim.h	2.82 KB
posix_opt.h	5.65 KB
printf-ldbl.h	986 B
pthreadtypes.h	6.33 KB
resource.h	9.21 KB
sched.h	7.37 KB
select.h	2.08 KB
select2.h	1.4 KB
sem.h	2.53 KB
semaphore.h	1.21 KB
setjmp.h	1.26 KB
setjmp2.h	1.67 KB
shm.h	3.44 KB
sigaction.h	2.79 KB
sigcontext.h	4.08 KB
siginfo.h	9.81 KB
signalfd.h	1.04 KB
signum.h	3.34 KB
sigset.h	4.48 KB
sigstack.h	1.49 KB
sigthread.h	1.64 KB
sockaddr.h	1.5 KB
socket.h	12.6 KB
socket2.h	2.95 KB
socket_type.h	2.16 KB
stab.def	8.82 KB
stat.h	7.46 KB
statfs.h	1.89 KB
statvfs.h	3.34 KB
stdio-ldbl.h	3.11 KB
stdio-lock.h	2.14 KB
stdio.h	5.45 KB
stdio2.h	12.36 KB
stdio_lim.h	1.34 KB
stdlib-float.h	1.12 KB
stdlib-ldbl.h	1.36 KB
stdlib.h	5.53 KB
string.h	56.48 KB
string2.h	46.08 KB
string3.h	4.38 KB
sys_errlist.h	1.19 KB
syscall.h	43.03 KB
sysctl.h	893 B
syslog-ldbl.h	1.17 KB
syslog-path.h	1.03 KB
syslog.h	1.66 KB
termios.h	5.23 KB
time.h	3.35 KB
timerfd.h	1.08 KB
timex.h	4.36 KB
types.h	7.55 KB
typesizes.h	3.15 KB
uio.h	2.42 KB
unistd.h	13.07 KB
ustat.h	1.06 KB
utmp.h	3.87 KB
utmpx.h	3.38 KB
utsname.h	1.19 KB
waitflags.h	1.61 KB
waitstatus.h	3.49 KB
wchar-ldbl.h	2.45 KB
wchar.h	1.11 KB
wchar2.h	20.04 KB
wordsize.h	327 B
xopen_lim.h	3.68 KB

Edit: fcntl2.h

/* Checking macros for fcntl functions.
   Copyright (C) 2007, 2012 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	_FCNTL_H
# error "Never include <bits/fcntl2.h> directly; use <fcntl.h> instead."
#endif

/* Check that calls to open and openat with O_CREAT or O_TMPFILE set have an
   appropriate third/fourth parameter.  */
#ifndef __USE_FILE_OFFSET64
extern int __open_2 (const char *__path, int __oflag) __nonnull ((1));
extern int __REDIRECT (__open_alias, (const char *__path, int __oflag, ...),
		       open) __nonnull ((1));
#else
extern int __REDIRECT (__open_2, (const char *__path, int __oflag),
		       __open64_2) __nonnull ((1));
extern int __REDIRECT (__open_alias, (const char *__path, int __oflag, ...),
		       open64) __nonnull ((1));
#endif
__errordecl (__open_too_many_args,
	     "open can be called either with 2 or 3 arguments, not more");
__errordecl (__open_missing_mode,
	     "open with O_CREAT or O_TMPFILE in second argument needs 3 arguments");

__fortify_function int
open (const char *__path, int __oflag, ...)
{
  if (__va_arg_pack_len () > 1)
    __open_too_many_args ();

if (__builtin_constant_p (__oflag))
    {
      if (__OPEN_NEEDS_MODE (__oflag) && __va_arg_pack_len () < 1)
	{
	  __open_missing_mode ();
	  return __open_2 (__path, __oflag);
	}
      return __open_alias (__path, __oflag, __va_arg_pack ());
    }

if (__va_arg_pack_len () < 1)
    return __open_2 (__path, __oflag);

return __open_alias (__path, __oflag, __va_arg_pack ());
}

#ifdef __USE_LARGEFILE64
extern int __open64_2 (const char *__path, int __oflag) __nonnull ((1));
extern int __REDIRECT (__open64_alias, (const char *__path, int __oflag,
					...), open64) __nonnull ((1));
__errordecl (__open64_too_many_args,
	     "open64 can be called either with 2 or 3 arguments, not more");
__errordecl (__open64_missing_mode,
	     "open64 with O_CREAT or O_TMPFILE in second argument needs 3 arguments");

__fortify_function int
open64 (const char *__path, int __oflag, ...)
{
  if (__va_arg_pack_len () > 1)
    __open64_too_many_args ();

if (__builtin_constant_p (__oflag))
    {
      if (__OPEN_NEEDS_MODE (__oflag) && __va_arg_pack_len () < 1)
	{
	  __open64_missing_mode ();
	  return __open64_2 (__path, __oflag);
	}
      return __open64_alias (__path, __oflag, __va_arg_pack ());
    }

if (__va_arg_pack_len () < 1)
    return __open64_2 (__path, __oflag);

return __open64_alias (__path, __oflag, __va_arg_pack ());
}
#endif

#ifdef __USE_ATFILE
# ifndef __USE_FILE_OFFSET64
extern int __openat_2 (int __fd, const char *__path, int __oflag)
     __nonnull ((2));
extern int __REDIRECT (__openat_alias, (int __fd, const char *__path,
					int __oflag, ...), openat)
     __nonnull ((2));
# else
extern int __REDIRECT (__openat_2, (int __fd, const char *__path,
				    int __oflag), __openat64_2)
     __nonnull ((2));
extern int __REDIRECT (__openat_alias, (int __fd, const char *__path,
					int __oflag, ...), openat64)
     __nonnull ((2));
# endif
__errordecl (__openat_too_many_args,
	     "openat can be called either with 3 or 4 arguments, not more");
__errordecl (__openat_missing_mode,
	     "openat with O_CREAT or O_TMPFILE in third argument needs 4 arguments");

__fortify_function int
openat (int __fd, const char *__path, int __oflag, ...)
{
  if (__va_arg_pack_len () > 1)
    __openat_too_many_args ();

if (__builtin_constant_p (__oflag))
    {
      if (__OPEN_NEEDS_MODE (__oflag) && __va_arg_pack_len () < 1)
	{
	  __openat_missing_mode ();
	  return __openat_2 (__fd, __path, __oflag);
	}
      return __openat_alias (__fd, __path, __oflag, __va_arg_pack ());
    }

if (__va_arg_pack_len () < 1)
    return __openat_2 (__fd, __path, __oflag);

return __openat_alias (__fd, __path, __oflag, __va_arg_pack ());
}

# ifdef __USE_LARGEFILE64
extern int __openat64_2 (int __fd, const char *__path, int __oflag)
     __nonnull ((2));
extern int __REDIRECT (__openat64_alias, (int __fd, const char *__path,
					  int __oflag, ...), openat64)
     __nonnull ((2));
__errordecl (__openat64_too_many_args,
	     "openat64 can be called either with 3 or 4 arguments, not more");
__errordecl (__openat64_missing_mode,
	     "openat64 with O_CREAT or O_TMPFILE in third argument needs 4 arguments");

__fortify_function int
openat64 (int __fd, const char *__path, int __oflag, ...)
{
  if (__va_arg_pack_len () > 1)
    __openat64_too_many_args ();

if (__builtin_constant_p (__oflag))
    {
      if (__OPEN_NEEDS_MODE (__oflag) && __va_arg_pack_len () < 1)
	{
	  __openat64_missing_mode ();
	  return __openat64_2 (__fd, __path, __oflag);
	}
      return __openat64_alias (__fd, __path, __oflag, __va_arg_pack ());
    }

if (__va_arg_pack_len () < 1)
    return __openat64_2 (__fd, __path, __oflag);

return __openat64_alias (__fd, __path, __oflag, __va_arg_pack ());
}
# endif
#endif