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IO.pipe #1097

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route opened this issue Oct 8, 2013 · 5 comments
Closed

IO.pipe #1097

route opened this issue Oct 8, 2013 · 5 comments
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core JRuby 1.7.x
Milestone
JRuby 9.0.0.0-pre1

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@route
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route commented Oct 8, 2013

This code works properly on MRI

def test_closing_write_end_of_pipe
  r, w = IO.pipe

  stdout = STDOUT.dup
  stdout.autoclose = false
  $stdout = w
  STDOUT.reopen(w)

  pid = Process.spawn('sleep 3 && echo "cat"')
  w.close

  STDOUT.reopen(stdout)
  $stdout = STDOUT

  r.read
end

At the end we will see the output of subprocess. We don't need write end of pipe in our process so we can freely close it. But for jruby the output is an empty string.
@headius
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headius commented Oct 10, 2013

Because JRuby may share a process with other applications, our reopen is simulated; we do not actually modify stdout (or stderr, or any open IO stream) when you reopen it. The target object just swaps "descriptors" with the given object. I'm not sure this is something we can make work without large changes and damaging all other users of stdio on the same JVM.

@route
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route commented Oct 10, 2013

Thank you @headius, is there any workaround? If I don't close it at the beginning I'll get IOError stream closed at the end.

This was referenced Oct 21, 2013
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@rtyler
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rtyler commented Jan 30, 2015

I'm wondering if this issue should be closed or not

@headius
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headius commented Jan 30, 2015

This does work in 9k on platforms where it's supported (not Windows). It will never work like MRI in the 1.7.x line. So we'll call it fixed in 9k.pre1.

@headius headius closed this as completed Jan 30, 2015
@headius headius added this to the JRuby 9.0.0.0-pre1 milestone Jan 30, 2015
@route
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route commented Feb 6, 2015

Thank you guys! I should definitely check out 9k!

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@headius @rtyler @route