7474else :
7575 _mswindows = True
7676
77- # wasm32-emscripten and wasm32-wasi do not support processes
78- _can_fork_exec = sys .platform not in "emscripten" , "wasi" }
77+ # some platforms do not support subprocesses
78+ _can_fork_exec = sys .platform not in "emscripten" , "wasi" , "ios" , "tvos" , "watchos" }
7979
8080if _mswindows :
8181 import _winapi
103103 if _can_fork_exec :
104104 from _posixsubprocess import fork_exec as _fork_exec
105105 # used in methods that are called by __del__
106- _waitpid = os .waitpid
107- _waitstatus_to_exitcode = os .waitstatus_to_exitcode
108- _WIFSTOPPED = os .WIFSTOPPED
109- _WSTOPSIG = os .WSTOPSIG
110- _WNOHANG = os .WNOHANG
106+ class _del_safe :
107+ waitpid = os .waitpid
108+ waitstatus_to_exitcode = os .waitstatus_to_exitcode
109+ WIFSTOPPED = os .WIFSTOPPED
110+ WSTOPSIG = os .WSTOPSIG
111+ WNOHANG = os .WNOHANG
112+ ECHILD = errno .ECHILD
111113 else :
112- _fork_exec = None
113- _waitpid = None
114- _waitstatus_to_exitcode = None
115- _WIFSTOPPED = None
116- _WSTOPSIG = None
117- _WNOHANG = None
114+ class _del_safe :
115+ waitpid = None
116+ waitstatus_to_exitcode = None
117+ WIFSTOPPED = None
118+ WSTOPSIG = None
119+ WNOHANG = None
120+ ECHILD = errno .ECHILD
121+
118122 import select
119123 import selectors
120124
@@ -1951,20 +1955,16 @@ def _execute_child(self, args, executable, preexec_fn, close_fds,
19511955 raise child_exception_type (err_msg )
19521956
19531957
1954- def _handle_exitstatus (self , sts ,
1955- _waitstatus_to_exitcode = _waitstatus_to_exitcode ,
1956- _WIFSTOPPED = _WIFSTOPPED ,
1957- _WSTOPSIG = _WSTOPSIG ):
1958+ def _handle_exitstatus (self , sts , _del_safe = _del_safe ):
19581959 """All callers to this function MUST hold self._waitpid_lock."""
19591960 # This method is called (indirectly) by __del__, so it cannot
19601961 # refer to anything outside of its local scope.
1961- if _WIFSTOPPED (sts ):
1962- self .returncode = - _WSTOPSIG (sts )
1962+ if _del_safe . WIFSTOPPED (sts ):
1963+ self .returncode = - _del_safe . WSTOPSIG (sts )
19631964 else :
1964- self .returncode = _waitstatus_to_exitcode (sts )
1965+ self .returncode = _del_safe . waitstatus_to_exitcode (sts )
19651966
1966- def _internal_poll (self , _deadstate = None , _waitpid = _waitpid ,
1967- _WNOHANG = _WNOHANG , _ECHILD = errno .ECHILD ):
1967+ def _internal_poll (self , _deadstate = None , _del_safe = _del_safe ):
19681968 """Check if child process has terminated. Returns returncode
19691969 attribute.
19701970
@@ -1980,13 +1980,13 @@ def _internal_poll(self, _deadstate=None, _waitpid=_waitpid,
19801980 try :
19811981 if self .returncode is not None :
19821982 return self .returncode # Another thread waited.
1983- pid , sts = _waitpid (self .pid , _WNOHANG )
1983+ pid , sts = _del_safe . waitpid (self .pid , _del_safe . WNOHANG )
19841984 if pid == self .pid :
19851985 self ._handle_exitstatus (sts )
19861986 except OSError as e :
19871987 if _deadstate is not None :
19881988 self .returncode = _deadstate
1989- elif e .errno == _ECHILD :
1989+ elif e .errno == _del_safe . ECHILD :
19901990 # This happens if SIGCLD is set to be ignored or
19911991 # waiting for child processes has otherwise been
19921992 # disabled for our process. This child is dead, we
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