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The C and C++ Include Header Files

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

     1	/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
     2	#ifndef _LINUX_EVENTFD_H
     3	#define _LINUX_EVENTFD_H
     4	
     5	#include <linux/fcntl.h>
     6	
     7	#define EFD_SEMAPHORE (1 << 0)
     8	#define EFD_CLOEXEC O_CLOEXEC
     9	#define EFD_NONBLOCK O_NONBLOCK
    10	
    11	#endif /* _LINUX_EVENTFD_H */