Class: Selenium::WebDriver::ChildProcess

Inherits:
Object
  • Object
show all
Defined in:
lib/selenium/webdriver/child_process.rb

Overview

Cross platform child process launcher

Defined Under Namespace

Modules: IronRubyProcess, JRubyProcess, WindowsProcess

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(*args) ⇒ ChildProcess

Returns a new instance of ChildProcess.



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# File 'lib/selenium/webdriver/child_process.rb', line 13

def initialize(*args)
  @args = args

  if Platform.jruby?
    extend JRubyProcess
  elsif Platform.ironruby?
    extend IronRubyProcess
  elsif Platform.os == :windows
    extend WindowsProcess
  end
end

Instance Attribute Details

#pid ⇒ Object (readonly)

Returns the value of attribute pid.



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# File 'lib/selenium/webdriver/child_process.rb', line 11

def pid
  @pid
end

Instance Method Details

#assert_started ⇒ Object

Raises:



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# File 'lib/selenium/webdriver/child_process.rb', line 114

def assert_started
  raise Error::WebDriverError, "process not started" unless @pid
end

#ensure_death ⇒ Object

Tries increasingly harsher methods to make the process die within a reasonable time



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# File 'lib/selenium/webdriver/child_process.rb', line 56

def ensure_death
  begin
    $stderr.puts "wait_nonblock(5) -> #{self}" if $DEBUG
    return wait_nonblock(5)
  rescue Error::TimeOutError
    # try next
  end

  $stderr.puts "TERM -> #{self}" if $DEBUG
  kill

  begin
    $stderr.puts "wait_nonblock(5) -> #{self}" if $DEBUG
    return wait_nonblock(5)
  rescue Error::TimeOutError
    # try next
  end

  $stderr.puts "KILL -> #{self}" if $DEBUG
  kill!

  $stderr.puts "wait_nonblock(5) -> #{self}" if $DEBUG
  wait_nonblock(5)
rescue Errno::ECHILD
  # great!
  true
end

#exit_value ⇒ Object

Returns the exit value of the process, or nil if it’s still alive.



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# File 'lib/selenium/webdriver/child_process.rb', line 34

def exit_value
  pid, status = Process.waitpid2(@pid, Process::WNOHANG)
  status.exitstatus if pid
end

#kill ⇒ Object 



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# File 'lib/selenium/webdriver/child_process.rb', line 104

def kill
  assert_started
  Process.kill('TERM', @pid)
end

#kill! ⇒ Object 



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# File 'lib/selenium/webdriver/child_process.rb', line 109

def kill!
  assert_started
  Process.kill('KILL', @pid)
end

#start ⇒ Object 



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# File 'lib/selenium/webdriver/child_process.rb', line 39

def start
  @pid = fork do
    unless $DEBUG
      [STDOUT, STDERR].each { |io| io.reopen("/dev/null") }
    end

    exec(*@args)
  end

  self
end

#ugly_death? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/selenium/webdriver/child_process.rb', line 25

def ugly_death?
  code = exit_value
  code && code != 0
end

#wait ⇒ Object 



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# File 'lib/selenium/webdriver/child_process.rb', line 97

def wait
  assert_started
  Process.waitpid2 @pid
rescue Errno::ECHILD
  nil
end

#wait_nonblock(timeout) ⇒ Object 



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# File 'lib/selenium/webdriver/child_process.rb', line 84

def wait_nonblock(timeout)
  end_time = Time.now + timeout
  until Time.now > end_time || exited = exit_value
    sleep 0.1
  end

  unless exited
    raise Error::TimeOutError, "process still alive after #{timeout} seconds"
  end

  exited
end