assert_finish 5, %q{
  r, w = IO.pipe
  t1 = Thread.new { r.sysread(1) }
  t2 = Thread.new { r.sysread(1) }
  sleep 0.1
  w.write "a"
  sleep 0.1
  w.write "a"
}, '[ruby-dev:31866]'

assert_finish 10, %q{
  begin
    require "io/nonblock"
    r, w = IO.pipe
    w.nonblock = true
    w.write_nonblock("a" * 100000)
    w.nonblock = false
    t1 = Thread.new { w.write("b" * 4096) }
    t2 = Thread.new { w.write("c" * 4096) }
    sleep 0.5
    r.sysread(4096).length
    sleep 0.5
    r.sysread(4096).length
    t1.join
    t2.join
  rescue LoadError
  end
}, '[ruby-dev:32566]'

assert_finish 1, %q{
  r, w = IO.pipe
  Thread.new {
  w << "ab"
  sleep 0.1
  w << "ab"
  }
  r.gets("abab")
}

assert_equal 'ok', %q{
  require 'tmpdir'
  begin
    tmpname = "#{Dir.tmpdir}/ruby-btest-#{$$}-#{rand(0x100000000).to_s(36)}"
    rw = File.open(tmpname, File::RDWR|File::CREAT|File::EXCL)
  rescue Errno::EEXIST
    retry
  end
  save = STDIN.dup
  STDIN.reopen(rw)
  STDIN.reopen(save)
  rw.close
  File.unlink(tmpname)
  :ok
}

assert_equal 'ok', %q{
  require 'tmpdir'
  begin
    tmpname = "#{Dir.tmpdir}/ruby-btest-#{$$}-#{rand(0x100000000).to_s(36)}"
    rw = File.open(tmpname, File::RDWR|File::CREAT|File::EXCL)
  rescue Errno::EEXIST
    retry
  end
  save = STDIN.dup
  STDIN.reopen(rw)
  STDIN.print "a"
  STDIN.reopen(save)
  rw.close
  File.unlink(tmpname)
  :ok
}

assert_normal_exit %q{
  ARGF.set_encoding "foo"
}