t/bin/unused_listen

   1 #!/usr/bin/env ruby
   2 # -*- encoding: binary -*-
   3 # this is to remain compatible with the unused_port function in the
   4 # Unicorn test/test_helper.rb file
   5 require 'socket'
   6 require 'tmpdir'
   7
   8 default_port = 8080
   9 addr = ENV['UNICORN_TEST_ADDR'] || '127.0.0.1'
  10 retries = 100
  11 base = 5000
  12 port = sock = lock_path = nil
  13
  14 begin
  15   begin
  16     port = base + rand(32768 - base)
  17     while port == default_port
  18       port = base + rand(32768 - base)
  19     end
  20
  21     sock = Socket.new(Socket::AF_INET, Socket::SOCK_STREAM, 0)
  22     sock.bind(Socket.pack_sockaddr_in(port, addr))
  23     sock.listen(5)
  24   rescue Errno::EADDRINUSE, Errno::EACCES
  25     sock.close rescue nil
  26     retry if (retries -= 1) >= 0
  27   end
  28
  29   # since we'll end up closing the random port we just got, there's a race
  30   # condition could allow the random port we just chose to reselect itself
  31   # when running tests in parallel with gmake.  Create a lock file while
  32   # we have the port here to ensure that does not happen.
  33   lock_path = "#{Dir::tmpdir}/unicorn_test.#{addr}:#{port}.lock"
  34   lock = File.open(lock_path, File::WRONLY|File::CREAT|File::EXCL, 0600)
  35 rescue Errno::EEXIST
  36   sock.close rescue nil
  37   retry
  38 end
  39 sock.close rescue nil
  40 puts %Q(listen=#{addr}:#{port} T_RM_LIST="$T_RM_LIST #{lock_path}")