Add TSTP support for 4.x, #3302

Changes.md

@@ -1,5 +1,10 @@
 # Sidekiq Changes
 
+HEAD
+-----------
+
+- Add support for TSTP signal, for Sidekiq 5.0 forward compatibility. [#3302]
+
 4.2.8
 -----------
 

lib/sidekiq/cli.rb

@@ -52,7 +52,7 @@ module Sidekiq
 
       self_read, self_write = IO.pipe
 
-      %w(INT TERM USR1 USR2 TTIN).each do |sig|
+      %w(INT TERM USR1 USR2 TTIN TSTP).each do |sig|
         begin
           trap sig do
             self_write.puts(sig)
@@ -135,6 +135,10 @@ module Sidekiq
       when 'USR1'
         Sidekiq.logger.info "Received USR1, no longer accepting new work"
         launcher.quiet
+      when 'TSTP'
+        # USR1 is not available on JVM, allow TSTP as an alternate signal
+        Sidekiq.logger.info "Received TSTP, no longer accepting new work"
+        launcher.quiet
       when 'USR2'
         if Sidekiq.options[:logfile]
           Sidekiq.logger.info "Received USR2, reopening log file"

lib/sidekiq/version.rb

@@ -1,4 +1,4 @@
 # frozen_string_literal: true
 module Sidekiq
-  VERSION = "4.2.8"
+  VERSION = "4.2.9"
 end