[3.6] bpo-30418: Popen.communicate() always ignore EINVAL (#2002)

Lib/subprocess.py

@@ -776,19 +776,21 @@ def _stdin_write(self, input):
                 self.stdin.write(input)
             except BrokenPipeError:
                 pass  # communicate() must ignore broken pipe errors.
-            except OSError as e:
-                if e.errno == errno.EINVAL and self.poll() is not None:
-                    # Issue #19612: On Windows, stdin.write() fails with EINVAL
-                    # if the process already exited before the write
+            except OSError as exc:
+                if exc.errno == errno.EINVAL:
+                    # bpo-19612, bpo-30418: On Windows, stdin.write() fails
+                    # with EINVAL if the child process exited or if the child
+                    # process is still running but closed the pipe.
                     pass
                 else:
                     raise
+
         try:
             self.stdin.close()
         except BrokenPipeError:
             pass  # communicate() must ignore broken pipe errors.
-        except OSError as e:
-            if e.errno == errno.EINVAL and self.poll() is not None:
+        except OSError as exc:
+            if exc.errno == errno.EINVAL:
                 pass
             else:
                 raise

Misc/NEWS

@@ -45,6 +45,9 @@ Core and Builtins
 Library
 -------
 
+- bpo-30418: On Windows, subprocess.Popen.communicate() now also ignore EINVAL
+  on stdin.write() if the child process is still running but closed the pipe.
+
 - bpo-29822: inspect.isabstract() now works during __init_subclass__.  Patch
   by Nate Soares.