137 struct socket {  struct
139 	short   so_type;                /* generic type, see socket.h */  argument
143 	u_int32_t so_options;           /* from socket call, see socket.h */  argument
151 	 * If so_head is 0, socket is not related to an accept.  argument
159 	struct  socket *so_head;        /* back pointer to accept socket */  argument
171 	 * Variables for socket buffering.  argument
183 		struct socket   *sb_so;         /* socket back ptr for kexts */  argument
201 #define LOW_SB_MAX      (2*9*1024)      /* lower limit on max socket buffer  argument
225 	void            (*so_event)(struct socket *, void *, uint32_t);  argument
227 	kauth_cred_t    so_cred;        /* cred of who opened the socket */  argument
230 	STAILQ_ENTRY(socket) so_cache_ent;      /* socache entry */  argument
232 	u_int64_t       cache_timestamp;        /* time socket was cached */  argument
238 	struct socket_filter_entry *so_filt;    /* NKE hook */  argument
244 #define SOF_DEFUNCT             0x00000008 /* socket marked as inactive */  argument
283 #define SOF1_EXTEND_BK_IDLE_INPROG      0x00000080 /* socket */  argument
309 	int             so_usecount;    /* refcounting of socket use */  argument
328 	                                         *  this socket background */  argument
329 	struct data_stats so_tc_stats[SO_TC_STATS_MAX];
330 	struct klist    so_klist;               /* klist for EV_SOCK events */
332 	struct flow_divert_pcb  *so_fd_pcb;     /* Flow Divert control block */
334 	struct soflow_db    *so_flow_db;
337 	struct cfil_info    *so_cfil;
338 	u_int32_t           so_state_change_cnt; /* incr for each connect, disconnect */
341 	pid_t           e_pid;          /* pid of the effective owner */
342 	u_int64_t       e_upid;         /* upid of the effective owner */
343 	pid_t           so_rpid;        /* pid of the responsible process */
345 	uuid_t          last_uuid;      /* uuid of most recent accessor */
346 	uuid_t          e_uuid;         /* uuid of effective owner */
347 	uuid_t          so_vuuid;       /* UUID of the Voucher originator */
348 	uuid_t          so_ruuid;       /* UUID of the responsible process */
350 	uid_t           so_persona_id;  /* persona of effective owner */
352 	int32_t         so_policy_gencnt; /* UUID policy gencnt */
354 	u_int64_t       so_extended_bk_start;
356 	u_int8_t        so_fallback_mode;
363 	u_int8_t        so_log_seqn;    /* Multi-layer Packet Logging rolling sequence number */
364 	uint8_t         so_mpkl_send_proto;
365 	uuid_t          so_mpkl_send_uuid;