Do not raise an exception on a closed DRb socket

This rescues some exceptions that could happen with a closed or
shutdown DRb socket. This can prevent the server from
exiting if an client socket is closed directly after it is
accepted.

Fixes [Bug #8039]

1 files changed, 2 insertions, 0 deletions

diff --git a/lib/drb/drb.rb b/lib/drb/drb.rb
index 25642dd939..9b4d675096 100644
--- a/lib/drb/drb.rb
+++ b/lib/drb/drb.rb
@@ -1024,6 +1024,8 @@ module DRb
 
     def set_sockopt(soc) # :nodoc:
       soc.setsockopt(Socket::IPPROTO_TCP, Socket::TCP_NODELAY, 1)
+    rescue IOError, Errno::ECONNRESET, Errno::EINVAL
+      # closed/shutdown socket, ignore error
     end
   end