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The C and C++ Include Header Files

cat -n /usr/include/linux/termios.h

     1	/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
     2	#ifndef _LINUX_TERMIOS_H
     3	#define _LINUX_TERMIOS_H
     4	
     5	#include <linux/types.h>
     6	#include <asm/termios.h>
     7	
     8	#endif