Differential D11003 Diff 42638 lib/libc/sys/getsockopt.2

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lib/libc/sys/getsockopt.2

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	Except as noted, each may be examined with			Except as noted, each may be examined with
	.Fn getsockopt			.Fn getsockopt
	and set with			and set with
	.Fn setsockopt .			.Fn setsockopt .
	.Bl -column SO_ACCEPTFILTER -offset indent			.Bl -column SO_ACCEPTFILTER -offset indent
	.It Dv SO_DEBUG Ta "enables recording of debugging information"			.It Dv SO_DEBUG Ta "enables recording of debugging information"
	.It Dv SO_REUSEADDR Ta "enables local address reuse"			.It Dv SO_REUSEADDR Ta "enables local address reuse"
	.It Dv SO_REUSEPORT Ta "enables duplicate address and port bindings"			.It Dv SO_REUSEPORT Ta "enables duplicate address and port bindings"
				.It Dv SO_REUSEPORT_LB Ta "enables duplicate address and port bindings with load balancing"
	.It Dv SO_KEEPALIVE Ta "enables keep connections alive"			.It Dv SO_KEEPALIVE Ta "enables keep connections alive"
	.It Dv SO_DONTROUTE Ta "enables routing bypass for outgoing messages"			.It Dv SO_DONTROUTE Ta "enables routing bypass for outgoing messages"
	.It Dv SO_LINGER Ta "linger on close if data present"			.It Dv SO_LINGER Ta "linger on close if data present"
	.It Dv SO_BROADCAST Ta "enables permission to transmit broadcast messages"			.It Dv SO_BROADCAST Ta "enables permission to transmit broadcast messages"
	.It Dv SO_OOBINLINE Ta "enables reception of out-of-band data in band"			.It Dv SO_OOBINLINE Ta "enables reception of out-of-band data in band"
	.It Dv SO_SNDBUF Ta "set buffer size for output"			.It Dv SO_SNDBUF Ta "set buffer size for output"
	.It Dv SO_RCVBUF Ta "set buffer size for input"			.It Dv SO_RCVBUF Ta "set buffer size for input"
	.It Dv SO_SNDLOWAT Ta "set minimum count for output"			.It Dv SO_SNDLOWAT Ta "set minimum count for output"
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	.Pp			.Pp
	.Dv SO_REUSEPORT			.Dv SO_REUSEPORT
	allows completely duplicate bindings by multiple processes			allows completely duplicate bindings by multiple processes
	if they all set			if they all set
	.Dv SO_REUSEPORT			.Dv SO_REUSEPORT
	before binding the port.			before binding the port.
	This option permits multiple instances of a program to each			This option permits multiple instances of a program to each
	receive UDP/IP multicast or broadcast datagrams destined for the bound port.			receive UDP/IP multicast or broadcast datagrams destined for the bound port.
				.Pp
				.Dv SO_REUSEPORT_LB
				allows completely duplicate bindings by multiple processes
				if they all set
				.Dv SO_REUSEPORT_LB
				before binding the port.
				Incoming TCP and UDP connections are distributed among the sharing
				processes based on a hash function of local port number, foreign IP
				address and port number. A maximum of 256 processes can share one socket.
	.Pp			.Pp
	.Dv SO_KEEPALIVE			.Dv SO_KEEPALIVE
	enables the			enables the
	periodic transmission of messages on a connected socket.			periodic transmission of messages on a connected socket.
	Should the			Should the
	connected party fail to respond to these messages, the connection is			connected party fail to respond to these messages, the connection is
	considered broken and processes using the socket are notified via a			considered broken and processes using the socket are notified via a
	.Dv SIGPIPE			.Dv SIGPIPE
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