method

tcp

v1_9_3_392 - Show latest stable - Class: Socket

tcp(host, port, local_host=nil, local_port=nil)

public

creates a new socket object connected to host:port using TCP/IP.

If local_host:local_port is given, the socket is bound to it.

If a block is given, the block is called with the socket. The value of the block is returned. The socket is closed when this method returns.

If no block is given, the socket is returned.

Socket.tcp("www.ruby-lang.org", 80) {|sock|
  sock.print "GET / HTTP/1.0\r\nHost: www.ruby-lang.org\r\n\r\n"
  sock.close_write
  puts sock.read
}

# File ext/socket/lib/socket.rb, line 236
  def self.tcp(host, port, local_host=nil, local_port=nil) # :yield: socket
    last_error = nil
    ret = nil

    local_addr_list = nil
    if local_host != nil || local_port != nil
      local_addr_list = Addrinfo.getaddrinfo(local_host, local_port, nil, :STREAM, nil)
    end

    Addrinfo.foreach(host, port, nil, :STREAM) {|ai|
      if local_addr_list
        local_addr = local_addr_list.find {|local_ai| local_ai.afamily == ai.afamily }
        next if !local_addr
      else
        local_addr = nil
      end
      begin
        sock = local_addr ? ai.connect_from(local_addr) : ai.connect
      rescue SystemCallError
        last_error = $!
        next
      end
      ret = sock
      break
    }
    if !ret
      if last_error
        raise last_error
      else
        raise SocketError, "no appropriate local address"
      end
    end
    if block_given?
      begin
        yield ret
      ensure
        ret.close if !ret.closed?
      end
    else
      ret
    end
  end

tcp

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