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/usr/aarch64-linux-gnu/include/linux/sock_diag.h is in linux-libc-dev-arm64-cross 3.13.0-12.32cross0.10.

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#ifndef __SOCK_DIAG_H__
#define __SOCK_DIAG_H__

#include <linux/types.h>

#define SOCK_DIAG_BY_FAMILY 20

struct sock_diag_req {
	__u8	sdiag_family;
	__u8	sdiag_protocol;
};

enum {
	SK_MEMINFO_RMEM_ALLOC,
	SK_MEMINFO_RCVBUF,
	SK_MEMINFO_WMEM_ALLOC,
	SK_MEMINFO_SNDBUF,
	SK_MEMINFO_FWD_ALLOC,
	SK_MEMINFO_WMEM_QUEUED,
	SK_MEMINFO_OPTMEM,
	SK_MEMINFO_BACKLOG,

	SK_MEMINFO_VARS,
};

#endif /* __SOCK_DIAG_H__ */