Differential D36328 Diff 109768 lib/libc/sys/getsockopt.2

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lib/libc/sys/getsockopt.2

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	.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT			.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY			.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF			.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	.\" SUCH DAMAGE.			.\" SUCH DAMAGE.
	.\"			.\"
	.\" @(#)getsockopt.2 8.4 (Berkeley) 5/2/95			.\" @(#)getsockopt.2 8.4 (Berkeley) 5/2/95
	.\" $FreeBSD$			.\" $FreeBSD$
	.\"			.\"
	.Dd February 8, 2021			.Dd August 24, 2022
	.Dt GETSOCKOPT 2			.Dt GETSOCKOPT 2
	.Os			.Os
	.Sh NAME			.Sh NAME
	.Nm getsockopt ,			.Nm getsockopt ,
	.Nm setsockopt			.Nm setsockopt
	.Nd get and set options on sockets			.Nd get and set options on sockets
	.Sh LIBRARY			.Sh LIBRARY
	.Lb libc			.Lb libc
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	.It Dv SO_REUSEPORT_LB Ta "enables duplicate address and port bindings with load balancing"			.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_RCVBUFFORCE Ta "set buffer size for input ignoring system limit"
	.It Dv SO_SNDLOWAT Ta "set minimum count for output"			.It Dv SO_SNDLOWAT Ta "set minimum count for output"
	.It Dv SO_RCVLOWAT Ta "set minimum count for input"			.It Dv SO_RCVLOWAT Ta "set minimum count for input"
	.It Dv SO_SNDTIMEO Ta "set timeout value for output"			.It Dv SO_SNDTIMEO Ta "set timeout value for output"
	.It Dv SO_RCVTIMEO Ta "set timeout value for input"			.It Dv SO_RCVTIMEO Ta "set timeout value for input"
	.It Dv SO_ACCEPTFILTER Ta "set accept filter on listening socket"			.It Dv SO_ACCEPTFILTER Ta "set accept filter on listening socket"
	.It Dv SO_NOSIGPIPE Ta			.It Dv SO_NOSIGPIPE Ta
	controls generation of			controls generation of
	.Dv SIGPIPE			.Dv SIGPIPE
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	buffer sizes allocated for output and input buffers, respectively.			buffer sizes allocated for output and input buffers, respectively.
	The buffer size may be increased for high-volume connections,			The buffer size may be increased for high-volume connections,
	or may be decreased to limit the possible backlog of incoming data.			or may be decreased to limit the possible backlog of incoming data.
	The system places an absolute maximum on these values, which is accessible			The system places an absolute maximum on these values, which is accessible
	through the			through the
	.Xr sysctl 3			.Xr sysctl 3
	MIB variable			MIB variable
	.Dq Li kern.ipc.maxsockbuf .			.Dq Li kern.ipc.maxsockbuf .
				.Dv SO_RCVBUFFORCE
				is a priviledged version of
				.Dv SO_RCVBUF
				adjusting the input buffer size ignoring system-wide limits.
	.Pp			.Pp
	.Dv SO_SNDLOWAT			.Dv SO_SNDLOWAT
	is an option to set the minimum count for output operations.			is an option to set the minimum count for output operations.
	Most output operations process all of the data supplied			Most output operations process all of the data supplied
	by the call, delivering data to the protocol for transmission			by the call, delivering data to the protocol for transmission
	and blocking as necessary for flow control.			and blocking as necessary for flow control.
	Nonblocking output operations will process as much data as permitted			Nonblocking output operations will process as much data as permitted
	subject to flow control without blocking, but will process no data			subject to flow control without blocking, but will process no data
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