gh-141473: Fix subprocess.Popen.communicate to send input to stdin

Author: mrowqa

Lib/subprocess.py

@@ -2105,7 +2105,7 @@ def _communicate(self, input, endtime, orig_timeout):
                 input_view = memoryview(self._input)
 
             with _PopenSelector() as selector:
-                if self.stdin and input:
+                if self.stdin and not self.stdin.closed and self._input:
                     selector.register(self.stdin, selectors.EVENT_WRITE)
                 if self.stdout and not self.stdout.closed:
                     selector.register(self.stdout, selectors.EVENT_READ)