* process.c (disable_child_handler_before_fork): New function.
  (disable_child_handler_fork_parent): Ditto.
  (disable_child_handler_fork_child): Ditto.
  (retry_fork_async_signal_safe): Call above functions to disable
  signal handlers in child process.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@47412 b2dd03c8-39d4-4d8f-98ff-823fe69b080e