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?? ..
?? English.rb(5.6 KB)
?? Env.rb(274 B)
?? abbrev.rb(2.5 KB)
?? base64.rb(3.37 KB)
?? benchmark.rb(17.73 KB)
?? bigdecimal
?? cgi
?? cgi-lib.rb(6.89 KB)
?? cgi.rb(73.74 KB)
?? complex.rb(12.84 KB)
?? csv.rb(24.46 KB)
?? date
?? date.rb(53.02 KB)
?? date2.rb(128 B)
?? debug.rb(20.61 KB)
?? delegate.rb(8.81 KB)
?? digest
?? digest.rb(1.12 KB)
?? dl
?? drb
?? drb.rb(19 B)
?? e2mmap.rb(4.04 KB)
?? erb.rb(21.38 KB)
?? eregex.rb(487 B)
?? expect.rb(633 B)
?? fileutils.rb(42.23 KB)
?? finalize.rb(5.38 KB)
?? find.rb(1.84 KB)
?? forwardable.rb(6.16 KB)
?? ftools.rb(6.17 KB)
?? generator.rb(8.1 KB)
?? getoptlong.rb(14.88 KB)
?? getopts.rb(2.25 KB)
?? gserver.rb(6.43 KB)
?? importenv.rb(590 B)
?? io
?? ipaddr.rb(21.96 KB)
?? irb
?? irb.rb(7.43 KB)
?? jcode.rb(4.3 KB)
?? kconv.rb(8.12 KB)
?? logger.rb(17.59 KB)
?? mailread.rb(1.28 KB)
?? mathn.rb(5.42 KB)
?? matrix.rb(27.21 KB)
?? md5.rb(411 B)
?? mkmf.rb(50.65 KB)
?? monitor.rb(7.93 KB)
?? mutex_m.rb(2.07 KB)
?? net
?? observer.rb(5.15 KB)
?? open-uri.rb(20.49 KB)
?? open3.rb(2.1 KB)
?? openssl
?? openssl.rb(575 B)
?? optparse
?? optparse.rb(47.12 KB)
?? ostruct.rb(3.35 KB)
?? parsearg.rb(1.55 KB)
?? parsedate.rb(1.33 KB)
?? pathname.rb(29.39 KB)
?? ping.rb(1.48 KB)
?? pp.rb(15.97 KB)
?? prettyprint.rb(18.33 KB)
?? profile.rb(90 B)
?? profiler.rb(1.59 KB)
?? pstore.rb(11.15 KB)
?? racc
?? rational.rb(12.05 KB)
?? rdoc
?? readbytes.rb(835 B)
?? resolv-replace.rb(1.55 KB)
?? resolv.rb(56.83 KB)
?? rexml
?? rinda
?? rss
?? rss.rb(504 B)
?? rubyunit.rb(180 B)
?? runit
?? scanf.rb(20.63 KB)
?? securerandom.rb(4.27 KB)
?? set.rb(27.08 KB)
?? sha1.rb(418 B)
?? shell
?? shell.rb(4.66 KB)
?? shellwords.rb(3.99 KB)
?? singleton.rb(8.08 KB)
?? soap
?? sync.rb(6.09 KB)
?? tempfile.rb(4.86 KB)
?? test
?? thread.rb(104 B)
?? thwait.rb(4.32 KB)
?? time.rb(31.58 KB)
?? timeout.rb(3 KB)
?? tmpdir.rb(3.69 KB)
?? tracer.rb(2.73 KB)
?? tsort.rb(7.99 KB)
?? un.rb(4.54 KB)
?? uri
?? uri.rb(710 B)
?? weakref.rb(2.68 KB)
?? webrick
?? webrick.rb(811 B)
?? wsdl
?? x86_64-linux
?? xmlrpc
?? xsd
?? yaml
?? yaml.rb(12.36 KB)

Editing: ping.rb

#
# = ping.rb: Check a host for upness
#
# Author:: Yukihiro Matsumoto
# Documentation:: Konrad Meyer
# 
# Performs the function of the basic network testing tool, ping.
# See: Ping.
#

require 'timeout'
require "socket"

# 
# Ping contains routines to test for the reachability of remote hosts.
# Currently the only routine implemented is pingecho().
#
# Ping.pingecho uses a TCP echo (not an ICMP echo) to determine if the
# remote host is reachable. This is usually adequate to tell that a remote
# host is available to telnet, ftp, or ssh to.
#
# Warning: Ping.pingecho may block for a long time if DNS resolution is
# slow. Requiring 'resolv-replace' allows non-blocking name resolution.
#
# Usage:
# 
#   require 'ping'
#
#   puts "'jimmy' is alive and kicking" if Ping.pingecho('jimmy', 10)
#
module Ping

# 
  # Return true if we can open a connection to the hostname or IP address
  # +host+ on port +service+ (which defaults to the "echo" port) waiting up
  # to +timeout+ seconds.
  #
  # Example:
  #
  #   require 'ping'
  #
  #   Ping.pingecho "google.com", 10, 80
  #
  def pingecho(host, timeout=5, service="echo")
    begin
      timeout(timeout) do
	s = TCPSocket.new(host, service)
	s.close
      end
    rescue Errno::ECONNREFUSED
      return true
    rescue Timeout::Error, StandardError
      return false
    end
    return true
  end
  module_function :pingecho
end

if $0 == __FILE__
  host = ARGV[0]
  host ||= "localhost"
  printf("%s alive? - %s\n", host,  Ping::pingecho(host, 5))
end

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Editing: ping.rb

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