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The C and C++ Include Header Files

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

     1	/* termios input mode definitions.  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-ciflags.h> directly; use <termios.h> instead."
    21	#endif
    22	
    23	/* c_iflag bits */
    24	#define IGNBRK	0000001  /* Ignore break condition.  */
    25	#define BRKINT	0000002  /* Signal interrupt on break.  */
    26	#define IGNPAR	0000004  /* Ignore characters with parity errors.  */
    27	#define PARMRK	0000010  /* Mark parity and framing errors.  */
    28	#define INPCK	0000020  /* Enable input parity check.  */
    29	#define ISTRIP	0000040  /* Strip 8th bit off characters.  */
    30	#define INLCR	0000100  /* Map NL to CR on input.  */
    31	#define IGNCR	0000200  /* Ignore CR.  */
    32	#define ICRNL	0000400  /* Map CR to NL on input.  */
    33	#define IUCLC	0001000  /* Map uppercase characters to lowercase on input
    34				    (not in POSIX).  */
    35	#define IXON	0002000  /* Enable start/stop output control.  */
    36	#define IXANY	0004000  /* Enable any character to restart output.  */
    37	#define IXOFF	0010000  /* Enable start/stop input control.  */
    38	#define IMAXBEL	0020000  /* Ring bell when input queue is full
    39				    (not in POSIX).  */
    40	#define IUTF8	0040000  /* Input is UTF8 (not in POSIX).  */