From: Hiroshi Nakamura <nakahiro@...>
Date: 2011-06-28T09:55:09+09:00
Subject: [ruby-core:37596] [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 Hiroshi Nakamura.


Looks similar to #4777. Would you please see that issue and try the resolution? (Updating Linux Kernel to 2.6.38.4 or later)
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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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