ruby
Ctrl-C stops working after using binding.irb
When using binding.irb, subsequent use of SIGINT fails.
current = Signal.trap(:INT) {puts "Handled"}
Process.kill(:INT, Process.pid)
binding.irb
Process.kill(:INT, Process.pid)
Gives:
Handled
From: /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/320667e1-6291-4143-979c-a113e661d440 @ line 5 :
1: current = Signal.trap(:INT) {puts "Handled"}
2:
3: Process.kill(:INT, Process.pid)
4:
=> 5: binding.irb
6:
7: Process.kill(:INT, Process.pid)
8:
irb(main):001:0> ^D
Using the following code:
binding.irb
current = Signal.trap(:INT) {puts "Handled"}
puts current.inspect
...we can see the signal is not restored:
From: /private/var/folders/3x/tvygzl0s65520b6t4tzqbt980000gn/T/fe62f3b3-200b-4bbb-926d-c6686dad1d93 @ line 1 :
=> 1: binding.irb
2:
3: current = Signal.trap(:INT) {puts "Handled"}
4:
5: puts current.inspect
irb(main):001:0>
#<Proc:0x00007fb8648481d0 /Users/samuel/.rubies/ruby-2.7.1/lib/ruby/2.7.0/irb.rb:465>
Here is an example of how to use signals which avoids leaking changes:
begin
previous_handler = Signal.trap(:INT) {puts "Handled"}
sleep 5
ensure
puts "Restoring original handler: #{previous_handler}"
Signal.trap(:INT, previous_handler)
sleep 5
end
I am facing this with Ruby 2.7.1 and Puma 4.3.3. After invoking binding.irb I am unable to kill the puma server. Any solutions or workarounds that I can try?
looks like for some recent versions of rubies this issue should be fixed here: https://github.com/ruby/irb/blob/master/lib/irb.rb#L485 for the cases when it's not fixed this workaround may help:
# fixes Ctrl+C issue with puma web server
# (e.g. after binding.irb invocation Ctrl+C stops working)
class Binding
alias __orig_irb irb
def irb
previous_handler = Signal.trap(:INT) {} # rubocop:disable Lint/EmptyBlock
__orig_irb # binding.irb sets up it's own SIGINT handler
Signal.trap(:INT, previous_handler)
end
end
place it somewhere at the end of config/environments/development.rb (for rails apps)
NOTE: it's quick and dirty stuff, not recommended for production usage
