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/usr/include/diet/sys/un.h is in dietlibc-dev 0.33~cvs20120325-6+deb8u1.

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#ifndef	_SYS_UN_H
#define	_SYS_UN_H

#include <sys/cdefs.h>

__BEGIN_DECLS

#define UNIX_PATH_MAX	108

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

__END_DECLS

#endif	/* sys/un.h  */