# File lib/merb-core/server.rb, line 324
      def _change_privilege(user, group=user)
        Merb.logger.warn! "Changing privileges to #{user}:#{group}"

        uid, gid = Process.euid, Process.egid

        begin
          target_uid = Etc.getpwnam(user).uid
        rescue ArgumentError => e
          Merb.fatal!("Failed to change to user #{user}, does the user exist?", e)
          return false
        end

        begin
          target_gid = Etc.getgrnam(group).gid
        rescue ArgumentError => e
          Merb.fatal!("Failed to change to group #{group}, does the group exist?", e)
          return false
        end

        if (uid != target_uid) || (gid != target_gid)
          # Change process ownership
          Process.initgroups(user, target_gid)
          Process::GID.change_privilege(target_gid)
          Process::UID.change_privilege(target_uid)
        end
        true
      rescue Errno::EPERM => e
        Merb.fatal! "Permission denied for changing user:group to #{user}:#{group}.", e
        false
      end