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The C and C++ Include Header Files

/usr/include/linux/pidfd.h


$ cat -n /usr/include/linux/pidfd.h

     1	/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
     2	
     3	#ifndef _LINUX_PIDFD_H
     4	#define _LINUX_PIDFD_H
     5	
     6	#include <linux/types.h>
     7	#include <linux/fcntl.h>
     8	
     9	/* Flags for pidfd_open().  */
    10	#define PIDFD_NONBLOCK O_NONBLOCK
    11	
    12	#endif /* _LINUX_PIDFD_H */