require 'socket'


Class Socket provides access to the underlying operating system socket implementations. It can be used to provide more operating system specific functionality than the protocol-specific socket classes.

The constants defined under Socket::Constants are also defined under Socket. For example, Socket::AF_INET is usable as well as Socket::Constants::AF_INET. See Socket::Constants for the list of constants.

Quick start

Many of the classes, such as TCPSocket, UDPSocket or UNIXSocket, ease the use of sockets comparatively to the equivalent C programming interface.

Let’s create an internet socket using the IPv4 protocol in a C-like manner:

require 'socket'

s = Socket::AF_INET, Socket::SOCK_STREAM
s.connect Socket.pack_sockaddr_in(80, '')

You could also use the TCPSocket class:

s = '', 80

A simple server might look like this:

require 'socket'

server = 2000 # Server bound to port 2000

loop do
  client = server.accept    # Wait for a client to connect
  client.puts "Hello !"
  client.puts "Time is #{}"

A simple client may look like this:

require 'socket'

s = 'localhost', 2000

while line = s.gets # Read lines from socket
  puts line         # and print them

s.close             # close socket when done

Socket Reference