83 struct	sockbuf {  struct
84 	struct	mtx sb_mtx;		/* sockbuf lock */  argument
87 	short	sb_state;	/* (a) socket state on sockbuf */  argument
89 	struct	mbuf *sb_mb;	/* (a) the mbuf chain */
90 	struct	mbuf *sb_mbtail; /* (a) the last mbuf in the chain */
91 	struct	mbuf *sb_lastrecord;	/* (a) first mbuf of last
93 	struct	mbuf *sb_sndptr; /* (a) pointer into mbuf chain */
94 	struct	mbuf *sb_fnrdy;	/* (a) pointer to first not ready buffer */
95 	u_int	sb_sndptroff;	/* (a) byte offset of ptr into chain */
96 	u_int	sb_acc;		/* (a) available chars in buffer */
97 	u_int	sb_ccc;		/* (a) claimed chars in buffer */
98 	u_int	sb_hiwat;	/* (a) max actual char count */
99 	u_int	sb_mbcnt;	/* (a) chars of mbufs used */
100 	u_int   sb_mcnt;        /* (a) number of mbufs in buffer */
101 	u_int   sb_ccnt;        /* (a) number of clusters in buffer */
102 	u_int	sb_mbmax;	/* (a) max chars of mbufs to use */
103 	u_int	sb_ctl;		/* (a) non-data chars in buffer */
104 	u_int	sb_tlscc;	/* (a) TLS chain characters */
105 	u_int	sb_tlsdcc;	/* (a) TLS characters being decrypted */
106 	int	sb_lowat;	/* (a) low water mark */
107 	sbintime_t	sb_timeo;	/* (a) timeout for read/write */
108 	uint64_t sb_tls_seqno;	/* (a) TLS seqno */
109 	struct	ktls_session *sb_tls_info; /* (a + b) TLS state */
110 	struct	mbuf *sb_mtls;	/* (a) TLS mbuf chain */
111 	struct	mbuf *sb_mtlstail; /* (a) last mbuf in TLS chain */
112 	short	sb_flags;	/* (a) flags, see above */
113 	int	(*sb_upcall)(struct socket *, void *, int); /* (a) */
114 	void	*sb_upcallarg;	/* (a) */
116 	struct	task sb_aiotask; /* AIO task */