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The C and C++ Include Header Files

cat -n /usr/include/linux/if_x25.h

     1	/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
     2	/*
     3	 *  Linux X.25 packet to device interface
     4	 *
     5	 *  This program is free software; you can redistribute it and/or modify
     6	 *  it under the terms of the GNU General Public License as published by
     7	 *  the Free Software Foundation; either version 2 of the License, or
     8	 *  (at your option) any later version.
     9	 *
    10	 *  This program 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
    13	 *  GNU General Public License for more details.
    14	 */
    15	
    16	#ifndef _IF_X25_H
    17	#define _IF_X25_H
    18	
    19	#include <linux/types.h>
    20	
    21	/* Documentation/networking/x25-iface.rst */
    22	#define X25_IFACE_DATA		0x00
    23	#define X25_IFACE_CONNECT	0x01
    24	#define X25_IFACE_DISCONNECT	0x02
    25	#define X25_IFACE_PARAMS	0x03
    26	
    27	#endif /* _IF_X25_H */