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5c2b644166
```ruby
r, w = IO.pipe
r.close
IO.for_fd(w.fileno).close
```
This code closes a file descriptor `w.fileno`, but `w` doesn't know
the closing. Another code can open same file descriptor with opening
file (`f`). After that, the `w` will GCed and `w.fileno` is closed
again, and `f.fileno` is closed too, so IO operations for `f` (`f.close`)
will cause EBADF.
To fix this issue, do this test in another process.
37 lines
693 B
Ruby
37 lines
693 B
Ruby
# frozen_string_literal: false
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require 'test/unit'
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class TestWait < Test::Unit::TestCase
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require '-test-/wait'
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def test_wait_for_valid_fd
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IO.pipe do |r,w|
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rc = IO.io_wait(w, IO::WRITABLE, nil)
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assert_equal IO::WRITABLE, rc
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end
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end
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def test_wait_for_invalid_fd
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assert_separately [], <<~'RUBY'
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require '-test-/wait'
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r, w = IO.pipe
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r.close
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IO.for_fd(w.fileno).close
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assert_raise(Errno::EBADF) do
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IO.io_wait(w, IO::WRITABLE, nil)
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end
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RUBY
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end
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def test_wait_for_closed_pipe
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IO.pipe do |r,w|
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w.close
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rc = IO.io_wait(r, IO::READABLE, nil)
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assert_equal IO::READABLE, rc
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end
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end
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end
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