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The C and C++ Include Header Files

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

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

     1	/* Old-style Unix parameters and limits.  Linux version.
     2	   Copyright (C) 1995-2024 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 _SYS_PARAM_H
    20	# error "Never use <bits/param.h> directly; include <sys/param.h> instead."
    21	#endif
    22	
    23	#ifndef ARG_MAX
    24	# define __undef_ARG_MAX
    25	#endif
    26	
    27	#include <linux/limits.h>
    28	#include <linux/param.h>
    29	
    30	/* The kernel headers define ARG_MAX.  The value is wrong, though.  */
    31	#ifdef __undef_ARG_MAX
    32	# undef ARG_MAX
    33	# undef __undef_ARG_MAX
    34	#endif
    35	
    36	#define	MAXSYMLINKS	20
    37	
    38	/* The following are not really correct but it is a value we used for a
    39	   long time and which seems to be usable.  People should not use NOFILE
    40	   and NCARGS anyway.  */
    41	#define NOFILE		256
    42	#define	NCARGS		131072
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