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# Copyright, 2018, by Samuel G. D. Williams. <http://www.codeotaku.com>
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
require 'async/io/generic'
module Async
module Process
class Child
def initialize(*args, **options)
# Setup a cross-thread notification pipe - nio4r can't monitor pids unfortunately:
pipe = ::IO.pipe
@input = Async::IO::Generic.new(pipe.first)
@output = pipe.last
@exit_status = nil
@pid = ::Process.spawn(*args, **options, pgroup: true)
@thread = Thread.new do
_, @exit_status = ::Process.wait2(@pid)
@output.close
end
end
attr :pid
def running?
@exit_status.nil?
end
def kill(signal = :TERM)
::Process.kill(signal, -@pid)
end
def wait
if @exit_status.nil?
wait_thread
end
return @exit_status
end
private
def wait_thread
@input.read(1)
ensure
# If the user stops this task, we kill the process:
if @exit_status.nil?
::Process.kill(:KILL, -@pid)
end
@thread.join
# We are done with the notification pipe:
@input.close
@output.close
end
end
end
end
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