755                  preexec_fn=None, close_fds=True,  argument
788             if pass_fds and not close_fds:
790                 close_fds = True
966             self._execute_child(args, executable, preexec_fn, close_fds,
1349         def _execute_child(self, args, executable, preexec_fn, close_fds,  argument
1401             if have_handle_list or (use_std_handles and close_fds):
1413                     if not close_fds:
1420                     close_fds = False
1438                                          int(not close_fds),
1682         def _execute_child(self, args, executable, preexec_fn, close_fds,  argument
1719                     and not close_fds
1777                             close_fds, tuple(sorted(map(int, fds_to_keep))),