1. 根目录:
2. include
3. net
4. netns
5. unix.h

/*
 * Unix network namespace
 */
#ifndef __NETNS_UNIX_H__
#define __NETNS_UNIX_H__

struct ctl_table_header;
struct netns_unix {
	int			sysctl_max_dgram_qlen;
	struct ctl_table_header	*ctl;
};

#endif /* __NETNS_UNIX_H__ */