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The C and C++ Include Header Files

cat -n /usr/include/x86_64-linux-gnu/bits/termios-struct.h

     1	/* struct termios definition.  Linux/generic version.
     2	   Copyright (C) 2019-2026 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 _TERMIOS_H
    20	# error "Never include <bits/termios-struct.h> directly; use <termios.h> instead."
    21	#endif
    22	
    23	#define NCCS 32
    24	struct termios
    25	  {
    26	    tcflag_t c_iflag;		/* input mode flags */
    27	    tcflag_t c_oflag;		/* output mode flags */
    28	    tcflag_t c_cflag;		/* control mode flags */
    29	    tcflag_t c_lflag;		/* local mode flags */
    30	    cc_t c_line;			/* line discipline */
    31	    cc_t c_cc[NCCS];		/* control characters */
    32	    /* Input and output baud rates.  */
    33	    __extension__ union {
    34	      speed_t __ispeed;
    35	      speed_t c_ispeed;
    36	    };
    37	#define _HAVE_STRUCT_TERMIOS_C_ISPEED 1
    38	    __extension__ union {
    39	      speed_t __ospeed;
    40	      speed_t c_ospeed;
    41	    };
    42	#define _HAVE_STRUCT_TERMIOS_C_OSPEED 1
    43	  };