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End of Life Ruby 3.0 has reached end of life and gets no more fixes. Switch to Ruby 4.0 →

instance method

Addrinfo#protocol

addrinfo.protocol => integer

returns the socket type as an integer.

Example
Addrinfo.tcp("localhost", 80).protocol == Socket::IPPROTO_TCP #=> true
See also #pfamily #socktype #listen #to_s also in 4.1 · 4.0 · 3.4 · 3.3 · 3.2 · 3.1