The socket_set_option() function sets the option
specified by the optname parameter, at the
specified protocol level, to the value pointed to
by the optval parameter for the
socket.
socket
level
The level parameter specifies the protocol
level at which the option resides. For example, to retrieve options at
the socket level, a level parameter of
SOL_SOCKET would be used. Other levels, such as
TCP, can be used by specifying the protocol number of that level.
Protocol numbers can be found by using the
getprotobyname() function.
optnameThe available socket options are the same as those for the socket_get_option() function.
optvalThe option value.