From: Stanislav Senotrusov <senotrusov@...>
Date: 2011-06-28T13:04:41+09:00
Subject: [ruby-core:37608] [Ruby 1.9 - Bug #4939] Signal handling does not working if single grave accent ( ` ) initiated command was issued before Signal.trap


Issue #4939 has been updated by Stanislav Senotrusov.


Thank you for pointing #4777. I've just read it and found it similar.

As it #4777 in my case when I sent CONT signal, the previously ignored TERM is handled well.

I'm running test case on Ubuntu 11.04 (Linux foo 2.6.38-8-generic #42-Ubuntu SMP Mon Apr 11 03:31:50 UTC 2011 i686 i686 i386 GNU/Linux) and think the 2.6.38.4 you suggested is older than my kernel (don't know really how to relate -8 and .4 in version)

Now I've try to upgrade to the 2.6.39 kernel as Peter Sanford mentioning in #7 comment on issue #4777.


And, I think I've observed issue #4608 with 100% CPU load, but did not isolate then well.
----------------------------------------
Bug #4939: Signal handling does not working if single grave accent ( ` ) initiated command was issued before Signal.trap
http://redmine.ruby-lang.org/issues/4939

Author: Stanislav Senotrusov
Status: Feedback
Priority: Normal
Assignee: Hiroshi Nakamura
Category: core
Target version: 
ruby -v: ruby 1.9.2p180 (2011-02-18 revision 30909) [i686-linux]


If grave accent ( ` ) shell command (`whoami` in the following case) is called BEFORE Signal.trap,
the signals will not be handled, and ruby default handling behavior also did not work.

Basically, when I press Ctrl+C or send kill -TERM nothing happens - the process continues to run (or sleep(60) in that case).


  # This `whoami` call prevents the following signal handlers from working
  # Just comment this line and signal handling will be ok
  STDOUT.write `whoami`

  STDOUT.puts "Press Ctrl+C"

  Signal.trap(:INT) { STDOUT.write "GOT INT\n"; exit! }
  Signal.trap(:TERM) { STDOUT.write "GOT TERM\n"; exit! }

  sleep 60




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