bsd/netinet/tcp_input.c

832 	struct sockbuf *sbrcv,
846 	if (newsize > sbrcv->sb_hiwat &&
847 		(sbreserve(sbrcv, newsize) == 1)) {
848 		sbrcv->sb_idealsize = min(max(sbrcv->sb_idealsize,
855 		sbrcv->sb_idealsize = min(sbrcv->sb_idealsize,
866 tcp_sbrcv_grow(struct tcpcb *tp, struct sockbuf *sbrcv,
870 		(sbrcv->sb_flags & SB_AUTOSIZE) == 0 ||
871 		tcp_cansbgrow(sbrcv) == 0 ||
872 		sbrcv->sb_hiwat >= tcp_autorcvbuf_max) {
896 				tcp_sbrcv_reserve(tp, sbrcv,
913 		 * 2. the space left in sbrcv is less than
918 			if ((tp->rfbuf_cnt > (sbrcv->sb_hiwat -
919 				(sbrcv->sb_hiwat >> tcp_rbuf_hiwat_shift)) ||
920 				(sbrcv->sb_hiwat - sbrcv->sb_cc) <
935 				tcp_sbrcv_reserve(tp, sbrcv,
936 					sbrcv->sb_hiwat + rcvbuf_inc,
958 tcp_sbrcv_trim(struct tcpcb *tp, struct sockbuf *sbrcv) {
959 	if (tcp_do_autorcvbuf == 1 && sbrcv->sb_idealsize > 0 &&
960 		sbrcv->sb_hiwat > sbrcv->sb_idealsize) {
963 		u_int32_t diff = sbrcv->sb_hiwat - sbrcv->sb_idealsize;
975 		u_int32_t leave = max(advwin, (sbrcv->sb_idealsize >> 4));
983 		trim = sbrcv->sb_hiwat - (sbrcv->sb_cc + leave);
987 			sbreserve(sbrcv, (sbrcv->sb_hiwat - trim));
1027 	struct sockbuf *sbrcv = &so->so_rcv;
1031 		(sbrcv->sb_flags & SB_AUTOSIZE) != 0) {
1032 		tcp_sbrcv_reserve(tp, sbrcv, newsize, 0);