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The C and C++ Include Header Files

cat -n /usr/include/linux/netfilter/xt_cpu.h

     1	/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
     2	#ifndef _XT_CPU_H
     3	#define _XT_CPU_H
     4	
     5	#include <linux/types.h>
     6	
     7	struct xt_cpu_info {
     8		__u32	cpu;
     9		__u32	invert;
    10	};
    11	
    12	#endif /*_XT_CPU_H*/