Class: Stalin::Killer

Inherits:
Object
  • Object
show all
Defined in:
lib/stalin/killer.rb

Overview

Kill a process by sending SIGQUIT several times, then SIGTERM, and finally SIGKILL.

Constant Summary collapse

MAX_GRACEFUL =

Number of cumulative shutdown tries before we escalate to abrupt-shutdown

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MAX_ABRUPT =

Number of cumulative shutdown tries before we escalate to untrappable SIGKILL

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Instance Method Summary collapse

Constructor Details

#initialize(pid, graceful, abrupt) ⇒ Killer

Returns a new instance of Killer.

Parameters:

  • pid (Integer) —

    target process ID



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# File 'lib/stalin/killer.rb', line 10

def initialize(pid, graceful, abrupt)
  @pid      = pid
  @graceful = graceful
  @abrupt   = abrupt
  @tries    = 0
end

Instance Method Details

#kill ⇒ Symbol

Try to kill the target process by sending it a shutdown signal.

Returns:

  • (Symbol) —

    name of signal that we sent



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# File 'lib/stalin/killer.rb', line 20

def kill
  case @tries
  when (0...MAX_GRACEFUL)
    sig = @graceful
  when (MAX_GRACEFUL...MAX_ABRUPT)
    sig = @abrupt
  else
    sig = :KILL
  end

  @tries += 1
  Process.kill(sig, @pid)
  sig
end