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--- !ruby/object:RI::MethodDescription
aliases: []
block_params:
comment:
- !ruby/struct:SM::Flow::P
body: Gets a socket option. These are protocol and system specific, see your local sytem documentation for details. The option is returned as a String with the data being the binary value of the socket option.
- !ruby/struct:SM::Flow::H
level: 3
text: Parameters
- !ruby/object:SM::Flow::LIST
contents:
- !ruby/struct:SM::Flow::LI
label: "*"
body: <tt>level</tt> is an integer, usually one of the SOL_ constants such as Socket::SOL_SOCKET, or a protocol level.
- !ruby/struct:SM::Flow::LI
label: "*"
body: <tt>optname</tt> is an integer, usually one of the SO_ constants, such as Socket::SO_REUSEADDR.
type: :BULLET
- !ruby/struct:SM::Flow::H
level: 3
text: Examples
- !ruby/struct:SM::Flow::P
body: "Some socket options are integers with boolean values, in this case #getsockopt could be called like this:"
- !ruby/struct:SM::Flow::VERB
body: " optval = sock.getsockopt(Socket::SOL_SOCKET,Socket::SO_REUSEADDR)\n optval = optval.unpack "i"\n reuseaddr = optval[0] == 0 ? false : true\n"
- !ruby/struct:SM::Flow::P
body: "Some socket options are integers with numeric values, in this case #getsockopt could be called like this:"
- !ruby/struct:SM::Flow::VERB
body: " optval = sock.getsockopt(Socket::IPPROTO_IP, Socket::IP_TTL)\n ipttl = optval.unpack("i")[0]\n"
- !ruby/struct:SM::Flow::P
body: "Option values may be structs. Decoding them can be complex as it involves examining your system headers to determine the correct definition. An example is a +struct linger+, which may be defined in your system headers as:"
- !ruby/struct:SM::Flow::VERB
body: " struct linger {\n int l_onoff;\n int l_linger;\n };\n"
- !ruby/struct:SM::Flow::P
body: "In this case #getsockopt could be called like this:"
- !ruby/struct:SM::Flow::VERB
body: " optval = sock.getsockopt(Socket::SOL_SOCKET, Socket::SO_LINGER)\n onoff, linger = optval.unpack "ii"\n"
full_name: BasicSocket#getsockopt
is_singleton: false
name: getsockopt
params: " getsockopt(level, optname)\n"
visibility: public