From: "rosenfeld (Rodrigo Rosenfeld Rosas)" <rr.rosas@...>
Date: 2013-11-06T07:34:48+09:00
Subject: [ruby-core:58190] [ruby-trunk - Bug #9082] popen3 hangs when stderr	gets lots of output


Issue #9082 has been updated by rosenfeld (Rodrigo Rosenfeld Rosas).


Sorry, haven't seen your message before posting, @akr. Thanks, I surely overlooked the documentation, sorry!
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Bug #9082: popen3 hangs when stderr gets lots of output
https://bugs.ruby-lang.org/issues/9082#change-42775

Author: rosenfeld (Rodrigo Rosenfeld Rosas)
Status: Rejected
Priority: Normal
Assignee: 
Category: lib
Target version: 
ruby -v: ruby 2.0.0p247 (2013-06-27 revision 41674) [x86_64-linux]
Backport: 


Create this program test.rb:

STDERR.puts "some error line\n" * 10_000

Then, try this:

ruby -r open3 -e "Open3.popen3('ruby test.rb'){|i,o,e,t|i.close;o.read}"

For this particular case, if I do "e.read" before "o.read" it works. But for my real case involving the "tidy" command with lots of warnings in the stderr it will freeze even if I call "e.read". Since I don't really need this output, I'm using popen2 and redirecting stderr to /dev/null, so this is not urgent, but I thought you'd like to know about this.

Also, if you replace 10_000 with 1_000 above it also works here.


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