bpo-30418: Popen.communicate() always ignore EINVAL (#2002) (#2006)

On Windows, subprocess.Popen.communicate() now also ignore EINVAL
on stdin.write() if the child process is still running but closed the
pipe.
(cherry picked from commit d52aa31378ae43e044a300edfe8285954c167216)

1 files changed, 5 insertions, 4 deletions

diff --git a/Lib/subprocess.py b/Lib/subprocess.py
index c6ecc46186..4b41f5ec5c 100644
--- a/Lib/subprocess.py
+++ b/Lib/subprocess.py
@@ -720,10 +720,11 @@ class Popen(object):
                         if e.errno == errno.EPIPE:
                             # communicate() should ignore broken pipe error
                             pass
-                        elif (e.errno == errno.EINVAL
-                              and self.poll() is not None):
-                            # Issue #19612: stdin.write() fails with EINVAL
-                            # if the process already exited before the write
+                        elif e.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