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NetBSD 6.1.5 - man page for tcp_congctl (netbsd section 9)

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TCP_CONGCTL(9)			  BSD Kernel Developer's Manual 		   TCP_CONGCTL(9)

NAME
     tcp_congctl -- TCP congestion control API

SYNOPSIS
     #include <netinet/tcp_congctl.h>

     int
     tcp_congctl_register(const char *, struct tcp_congctl *);

     int
     tcp_congctl_unregister(const char *);

DESCRIPTION
     The tcp_congctrl API is used to add or remove TCP congestion control algorithms on-the-fly
     and to modularize them.  It includes basically two functions:

     tcp_congctl_register(const char *, struct tcp_congctl *)
	    Registers a new congestion control algorithm.  The struct tcp_congctl argument must
	    contain a list of callbacks like the following:

		  struct tcp_congctl {
			  int  (*fast_retransmit)(struct tcpcb *,
			      struct tcphdr *);
			  void (*slow_retransmit)(struct tcpcb *);
			  void (*fast_retransmit_newack)(struct tcpcb *,
			      struct tcphdr *);
			  void (*newack)(struct tcpcb *,
			      struct tcphdr *);
			  void (*cong_exp)(struct tcpcb *);
		  };

     tcp_congctl_unregister(const char *)
	    If found, unregister the selected TCP congestion control algorithm.

RETURN VALUES
     tcp_congctl_register() and tcp_congctl_unregister() both return 0 when there is no error.
     If the name is already registered, tcp_congctl_register() will return EEXIST.
     tcp_congctl_unregister() can return ENOENT if there is no congestion control algorithm by
     that name and can return EBUSY if the matched algorithm is being used by userspace applica-
     tions.

FILES
     Implementation is in sys/netinet/tcp_congctl.c and the interface is in
     sys/netinet/tcp_congctl.h.

SEE ALSO
     tcp(4)

BSD					 October 15, 2006				      BSD
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