Ruby

def have_poll?

IO.respond_to? :select_with_poll

end

def test_select_raise

require 'fcntl'

fd = STDERR.fcntl(Fcntl::F_DUPFD)

io = IO.for_fd(fd, mode: 'w')

io2 = IO.for_fd(fd, mode: 'w')

io2.close

assert_raise(Errno::EBADF) {select [io], [io], [io]}

end

def test_poll_no_raise

require 'fcntl'

fd = STDERR.fcntl(Fcntl::F_DUPFD)

io = IO.for_fd(fd, mode: 'w')

io2 = IO.for_fd(fd, mode: 'w')

io2.close

assert_equal [[],[],[],[io]], (IO.select_with_poll [io], [io], [io], [io])

end if have_poll?

def startcmd *cmd

spawn_in, pipe_in = IO.pipe

pipe_out, spawn_out = IO.pipe

pipe_err, spawn_err = IO.pipe

pid = spawn(*cmd, :err=>spawn_err, :out=>spawn_out, :in=>spawn_in, :close_others=>true)

[spawn_in, spawn_out, spawn_err].each{|fd| fd.close}

[[pipe_in, pipe_out, pipe_err],pid]

end

def endcmd stuff

fds, pid = stuff

fds.each{|fd| fd.close rescue nil}

Process.waitpid pid

end

def test_select_cat

stuff = startcmd *%w(cat)

fds = stuff[0]

assert_equal [[],[fds[0]],[]], (IO.select fds, fds, fds, 0)

assert_equal [[],[fds[0]],[],[]], (IO.select_with_poll fds, fds, fds, fds, 0) if have_poll?

endcmd stuff

end

def test_select_uname

stuff = startcmd *%w(uname -a)

fds = stuff[0]

sleep 0.1

assert_equal [[fds[0],fds[1],fds[2]],[fds[0]],[]], (IO.select fds, fds, fds, 0)

assert_equal [[fds[1]],[fds[0]],[],[fds[0],fds[1],fds[2]]], (IO.select_with_poll fds, fds, fds, fds, 0) if have_poll?

endcmd stuff

end