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# frozen_string_literal: true
require 'test/unit'
require 'io/wait'
# test uncommon device types to check portability problems
# We may optimize IO#wait_*able for non-Linux kernels in the future
class TestIOWaitUncommon < Test::Unit::TestCase
def test_tty_wait
begin
tty = File.open('/dev/tty', 'w+')
rescue Errno::ENOENT, Errno::ENXIO => e
skip "/dev/tty: #{e.message} (#{e.class})"
end
assert_include [ nil, tty ], tty.wait_readable(0)
assert_equal tty, tty.wait_writable(1), 'portability test'
ensure
tty&.close
end
def test_fifo_wait
skip 'no mkfifo' unless File.respond_to?(:mkfifo) && IO.const_defined?(:NONBLOCK)
Dir.mktmpdir('rubytest-fifo') do |dir|
fifo = "#{dir}/fifo"
assert_equal 0, File.mkfifo(fifo)
rd = Thread.new { File.open(fifo, IO::RDONLY|IO::NONBLOCK) }
begin
wr = File.open(fifo, IO::WRONLY|IO::NONBLOCK)
rescue Errno::ENXIO
Thread.pass
end until wr
assert_instance_of File, rd.value
assert_instance_of File, wr
rd = rd.value
assert_nil rd.wait_readable(0)
assert_same wr, wr.wait_writable(0)
wr.syswrite 'hi'
assert_same rd, rd.wait_readable(1)
wr.close
assert_equal 'hi', rd.gets
rd.close
end
end
# used to find portability problems because some ppoll implementations
# are incomplete and do not work for certain "file" types
def check_dev(dev, m = :wait_readable)
begin
fp = File.open("/dev/#{dev}", m == :wait_readable ? 'r' : 'w')
rescue SystemCallError => e
skip "#{dev} could not be opened #{e.message} (#{e.class})"
end
assert_same fp, fp.__send__(m)
ensure
fp&.close
end
def test_wait_readable_urandom
check_dev 'urandom'
end
def test_wait_readable_random
File.open('/dev/random') do |fp|
assert_nothing_raised do
fp.wait_readable(0)
end
end
rescue SystemCallError => e
skip "/dev/random could not be opened #{e.message} (#{e.class})"
end
def test_wait_readable_zero
check_dev 'zero'
end
def test_wait_writable_null
check_dev 'null', :wait_writable
end
end
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