The C and C++ Include Header Files

/usr/include/x86_64-linux-gnu/bits/time64.h


$ cat -n /usr/include/x86_64-linux-gnu/bits/time64.h

     1	/* bits/time64.h -- underlying types for __time64_t.  Generic version.
     2	   Copyright (C) 2018-2024 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 _BITS_TYPES_H
    20	# error "Never include <bits/time64.h> directly; use <sys/types.h> instead."
    21	#endif
    22	
    23	#ifndef	_BITS_TIME64_H
    24	#define	_BITS_TIME64_H	1
    25	
    26	/* Define __TIME64_T_TYPE so that it is always a 64-bit type.  */
    27	
    28	#if __TIMESIZE == 64
    29	/* If we already have 64-bit time type then use it.  */
    30	# define __TIME64_T_TYPE		__TIME_T_TYPE
    31	#else
    32	/* Define a 64-bit time type alongsize the 32-bit one.  */
    33	# define __TIME64_T_TYPE		__SQUAD_TYPE
    34	#endif
    35	
    36	#endif /* bits/time64.h */