require_relative '../../spec_helper'
require_relative 'fixtures/common'

describe "Process.wait" do
  ProcessSpecs.use_system_ruby(self)

  before :all do
    begin
      leaked = Process.waitall
      puts "leaked before wait specs: #{leaked}" unless leaked.empty?
    rescue NotImplementedError
    end
  end

  without_feature :mjit do # [Bug #14867]
    it "raises an Errno::ECHILD if there are no child processes" do
      lambda { Process.wait }.should raise_error(Errno::ECHILD)
    end

    platform_is_not :windows do
      it "returns its childs pid" do
        pid = Process.spawn(ruby_cmd('exit'))
        Process.wait.should == pid
      end

      it "sets $? to a Process::Status" do
        pid = Process.spawn(ruby_cmd('exit'))
        Process.wait
        $?.should be_kind_of(Process::Status)
        $?.pid.should == pid
      end

      it "waits for any child process if no pid is given" do
        pid = Process.spawn(ruby_cmd('exit'))
        Process.wait.should == pid
        lambda { Process.kill(0, pid) }.should raise_error(Errno::ESRCH)
      end

      it "waits for a specific child if a pid is given" do
        pid1 = Process.spawn(ruby_cmd('exit'))
        pid2 = Process.spawn(ruby_cmd('exit'))
        Process.wait(pid2).should == pid2
        Process.wait(pid1).should == pid1
        lambda { Process.kill(0, pid1) }.should raise_error(Errno::ESRCH)
        lambda { Process.kill(0, pid2) }.should raise_error(Errno::ESRCH)
      end

      it "coerces the pid to an Integer" do
        pid1 = Process.spawn(ruby_cmd('exit'))
        Process.wait(mock_int(pid1)).should == pid1
        lambda { Process.kill(0, pid1) }.should raise_error(Errno::ESRCH)
      end

      # This spec is probably system-dependent.
      it "waits for a child whose process group ID is that of the calling process" do
        pid1 = Process.spawn(ruby_cmd('exit'), pgroup: true)
        pid2 = Process.spawn(ruby_cmd('exit'))

        Process.wait(0).should == pid2
        Process.wait.should == pid1
      end

      # This spec is probably system-dependent.
      it "doesn't block if no child is available when WNOHANG is used" do
        read, write = IO.pipe
        pid = Process.fork do
          read.close
          Signal.trap("TERM") { Process.exit! }
          write << 1
          write.close
          sleep
        end

        Process.wait(pid, Process::WNOHANG).should be_nil

        # wait for the child to setup its TERM handler
        write.close
        read.read(1)
        read.close

        Process.kill("TERM", pid)
        Process.wait.should == pid
      end

      it "always accepts flags=0" do
        pid = Process.spawn(ruby_cmd('exit'))
        Process.wait(-1, 0).should == pid
        lambda { Process.kill(0, pid) }.should raise_error(Errno::ESRCH)
      end
    end
  end
end