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The C and C++ Include Header Files

/usr/include/x86_64-linux-gnu/c++/11/bits/c++io.h

$ cat -n /usr/include/x86_64-linux-gnu/c++/11/bits/c++io.h

     1	// Underlying io library details -*- C++ -*-
     2	
     3	// Copyright (C) 2000-2021 Free Software Foundation, Inc.
     4	//
     5	// This file is part of the GNU ISO C++ Library.  This library is free
     6	// software; you can redistribute it and/or modify it under the
     7	// terms of the GNU General Public License as published by the
     8	// Free Software Foundation; either version 3, or (at your option)
     9	// any later version.
    10	
    11	// This library is distributed in the hope that it will be useful,
    12	// but WITHOUT ANY WARRANTY; without even the implied warranty of
    13	// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    14	// GNU General Public License for more details.
    15	
    16	// Under Section 7 of GPL version 3, you are granted additional
    17	// permissions described in the GCC Runtime Library Exception, version
    18	// 3.1, as published by the Free Software Foundation.
    19	
    20	// You should have received a copy of the GNU General Public License and
    21	// a copy of the GCC Runtime Library Exception along with this program;
    22	// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
    23	// <http://www.gnu.org/licenses/>.
    24	
    25	/** @file bits/c++io.h
    26	 *  This is an internal header file, included by other library headers.
    27	 *  Do not attempt to use it directly. @headername{ios}
    28	 */
    29	
    30	// c_io_stdio.h - Defines for using "C" stdio.h
    31	
    32	#ifndef _GLIBCXX_CXX_IO_H
    33	#define _GLIBCXX_CXX_IO_H 1
    34	
    35	#include <cstdio>
    36	#include <bits/gthr.h>
    37	
    38	namespace std _GLIBCXX_VISIBILITY(default)
    39	{
    40	_GLIBCXX_BEGIN_NAMESPACE_VERSION
    41	
    42	  typedef __gthread_mutex_t __c_lock;
    43	
    44	  // for basic_file.h
    45	  typedef FILE __c_file;
    46	
    47	_GLIBCXX_END_NAMESPACE_VERSION
    48	} // namespace
    49	
    50	#endif
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