* process.c (has_privilege): New function.
  (retry_fork_async_signal_safe): Don't use vfork() for privileged
  process.

* configure.in (getresuid): Check function.
  (getresgid): Ditto.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@47386 b2dd03c8-39d4-4d8f-98ff-823fe69b080e