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The C and C++ Include Header Files

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

     1	/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
     2	/* atmarp.h - ATM ARP protocol and kernel-demon interface definitions */
     3	 
     4	/* Written 1995-1999 by Werner Almesberger, EPFL LRC/ICA */
     5	 
     6	
     7	#ifndef _LINUX_ATMARP_H
     8	#define _LINUX_ATMARP_H
     9	
    10	#include <linux/types.h>
    11	#include <linux/atmapi.h>
    12	#include <linux/atmioc.h>
    13	
    14	
    15	#define ATMARP_RETRY_DELAY 30		/* request next resolution or forget
    16						   NAK after 30 sec - should go into
    17						   atmclip.h */
    18	#define ATMARP_MAX_UNRES_PACKETS 5	/* queue that many packets while
    19						   waiting for the resolver */
    20	
    21	
    22	#define ATMARPD_CTRL	_IO('a',ATMIOC_CLIP+1)	/* become atmarpd ctrl sock */
    23	#define ATMARP_MKIP	_IO('a',ATMIOC_CLIP+2)	/* attach socket to IP */
    24	#define ATMARP_SETENTRY	_IO('a',ATMIOC_CLIP+3)	/* fill or hide ARP entry */
    25	#define ATMARP_ENCAP	_IO('a',ATMIOC_CLIP+5)	/* change encapsulation */
    26	
    27	
    28	enum atmarp_ctrl_type {
    29		act_invalid,		/* catch uninitialized structures */
    30		act_need,		/* need address resolution */
    31		act_up,			/* interface is coming up */
    32		act_down,		/* interface is going down */
    33		act_change		/* interface configuration has changed */
    34	};
    35	
    36	struct atmarp_ctrl {
    37		enum atmarp_ctrl_type	type;	/* message type */
    38		int			itf_num;/* interface number (if present) */
    39		__be32			ip;	/* IP address (act_need only) */
    40	};
    41	
    42	#endif