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/usr/include/linux/un.h is in linux-libc-dev 4.9.144-3.

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#ifndef _LINUX_UN_H
#define _LINUX_UN_H

#include <linux/socket.h>

#define UNIX_PATH_MAX	108

struct sockaddr_un {
	__kernel_sa_family_t sun_family; /* AF_UNIX */
	char sun_path[UNIX_PATH_MAX];	/* pathname */
};

#endif /* _LINUX_UN_H */