set close-on-exec on all long-lived descriptors

This means ruby 1.9.3 should be supported, as well as Ruby
implementations which do not set the close-on-exec flag by default.

Note: this is only best-effort outside of modern Linux with threads,
since a multithreaded process may create and inadvertantly share
descriptors.  This is why Linux supports O_CLOEXEC, SOCK_CLOEXEC and
friends, as kernel support is the only way to sanely fix this.

1 files changed, 1 insertions, 0 deletions

diff --git a/lib/yahns/socket_helper.rb b/lib/yahns/socket_helper.rb
index 61f2b0f..62a6da2 100644
--- a/lib/yahns/socket_helper.rb
+++ b/lib/yahns/socket_helper.rb
@@ -5,6 +5,7 @@
 module Yahns::SocketHelper # :nodoc:
   def set_server_sockopt(sock, opt)
     opt = {backlog: 1024}.merge!(opt) if opt
+    sock.close_on_exec = true
 
     TCPSocket === sock and sock.setsockopt(:IPPROTO_TCP, :TCP_NODELAY, 1)
     sock.setsockopt(:SOL_SOCKET, :SO_KEEPALIVE, 1)