When writing to STDOUT redirected to a closed pipe, no broken pipe

[gogainda]

error message will be shown now

Ruby commit ruby/ruby@6f28ebd

before

~ % seq 100 | ruby -pe 'print if 12..' | head -2
1
2
<internal:core> core/errno.rb:54:in `handle_errno': Broken pipe (Errno::EPIPE)
	from <internal:core> core/posix.rb:449:in `write_string_native'
	from <internal:core> core/io.rb:2396:in `write'
	from <internal:core> core/kernel.rb:440:in `block in print'
	from <internal:core> core/kernel.rb:439:in `each'
	from <internal:core> core/kernel.rb:439:in `print'
	from -e:1:in `<main>'
~ % yes | ruby -pe 'print' | head -1
y
<internal:core> core/errno.rb:54:in `handle_errno': Broken pipe (Errno::EPIPE)
	from <internal:core> core/posix.rb:449:in `write_string_native'
	from <internal:core> core/io.rb:2396:in `write'
	from <internal:core> core/kernel.rb:440:in `block in print'
	from <internal:core> core/kernel.rb:439:in `each'
	from <internal:core> core/kernel.rb:439:in `print'
	from -e:1:in `<main>'

after

~ % seq 100 | ruby -pe 'print if 12..' | head -2
1
2
~ % yes | ruby -pe 'print' | head -1            
y

only problem I found is that -n is not working on truffleruby, so I don't know how it behaves with this fix

[gogainda]

apparently I broke other EPIPE related tests @eregon

[eregon]

This is part of the Ruby 3.0 changes:

[medium] When writing to STDOUT redirected to a closed pipe, no broken pipe error message will be shown now. [Feature #14413]

[gogainda]

Not sure how to write test for it

[eregon]

@gogainda One way is to look at the CRuby test to see how it's tested. I'll write a spec for it this time.

[eregon]

Thank you!

[gogainda]

@eregon is there anything I can do to move this PR forward?

[eregon]

Sorry, I somehow lost sight of this PR, it looks like it didn't merge due to a new CI job being added and it didn't automatically run it.
I'll rebase and put it in the merge queue.

[eregon]

Actually there are two MRI tests failing:

  1) Failure:
TestPipe#test_stdout_epipe [/b/b/e/main/test/mri/tests/ruby/test_pipe.rb:40]:
[Errno::EPIPE] exception expected, not #<SignalException: SIGPIPE>.

  2) Failure:
TestPipe::WithConversion#test_stdout_epipe [/b/b/e/main/test/mri/tests/ruby/test_pipe.rb:40]:
[Errno::EPIPE] exception expected, not #<SignalException: SIGPIPE>.

[eregon]

I'll just tag that test for now, it seems a weird edge case with STDOUT.reopen clearing the flag or so.