addresses/sockets_of_every_kind_no_parens.rb

tests/_examples/addresses/sockets_of_every_kind_no_parens.rb in the metorex repository.

require 'socket'

# The same as `sockets_of_every_kind.rb`, written without parentheses.
# Two sockets already joined to each other, in either family.
first, second = Socket.pair(Socket::AF_UNIX, Socket::SOCK_STREAM)
first.puts 'over a path'
p second.gets
p first.local_address.afamily == Socket::AF_UNIX
first.close
second.close

# A socket carrying each message on its own says where each one came from.
sending = Socket.new(:INET, :DGRAM)
receiving = Socket.new(:INET, :DGRAM)
receiving.bind(Socket.sockaddr_in(0, '127.0.0.1'))
sending.send('one message', 0, receiving.getsockname)
message, from = receiving.recvfrom(11)
p message
p from.class
p from.ip_address
sending.close
receiving.close

# Reading into a buffer keeps the encoding the buffer was tagged with.
listener = Socket.new(:INET, :STREAM)
listener.bind(Socket.sockaddr_in(0, '127.0.0.1'))
listener.listen 1
client = Socket.tcp('127.0.0.1', listener.connect_address.ip_port)
client.write('bytes')
accepted, address = listener.accept
buffer = 'held'.dup.force_encoding(Encoding::UTF_8)
accepted.read(5, buffer)
p buffer
p buffer.encoding
p address.class
accepted.close
client.close
listener.close

# What the system knows about names, ports, and addresses.
p Socket.getservbyname('ftp')
p Socket.gethostbyname('<broadcast>')[0]
p Socket.getnameinfo(['AF_INET', 21, '127.0.0.1'], Socket::NI_NUMERICHOST | Socket::NI_NUMERICSERV)

Output:

"over a path\n"
true
"one message"
Addrinfo
"127.0.0.1"
"bytes"
#<Encoding:UTF-8>
Addrinfo
21
"255.255.255.255"
["127.0.0.1", "21"]