Cornelius Diekmann added the comment: I observed the same issue, but the problem occurs mainly when reading data. In my proposed patch in issue29070, I use the existing pty._writen() to make sure all data is written. As Martin mentioned, reading is a problem. My patch proposes _os_timeout_read(), _os_readline(), _os_read_exactly(), _os_read_exhaust_exactly() to give fine-grained, deterministic control. Cheeky advertisement: Anybody cares to review issue29070 or cherry pick the pty._writen() and _os_read* parts? :)
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