René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"os.close(1) crashes REPL","articleBody":"## Summary\n\nI was trying to work on #5521 and I noticed that in the repl if you try to `os.close(sys.stdout.fileno())` or more concisely `os.close(1)` it crashes with a `Readline error: Errno(EBADF)` like this:\n```console\nomarabdelgawad@omarabdelgawad:~/my_workspace/RustPython$ cargo run --release \n    Finished `release` profile [optimized] target(s) in 0.11s\n     Running `target/release/rustpython`\nWelcome to the magnificent Rust Python 0.4.0 interpreter 😱 🖖\nRustPython 3.13.0\nType \"help\", \"copyright\", \"credits\" or \"license\" for more information.\n\u003e\u003e\u003e\u003e\u003e import os\n\u003e\u003e\u003e\u003e\u003e os.close(1)\nReadline error: Errno(EBADF)\nomarabdelgawad@omarabdelgawad:~/my_workspace/RustPython$\n```\n\n## Details\n\nwhere with CPython it doesnt crash:\n```console\nomarabdelgawad@omarabdelgawad:~$ python\nPython 3.12.3 (main, Aug 14 2025, 17:47:21) [GCC 13.3.0] on linux\nType \"help\", \"copyright\", \"credits\" or \"license\" for more information.\n\u003e\u003e\u003e import os\n\u003e\u003e\u003e os.close(1)\n\u003e\u003e\u003e x = 2\n\u003e\u003e\u003e print(x)\nTraceback (most recent call last):\n  File \"\u003cstdin\u003e\", line 1, in \u003cmodule\u003e\nOSError: [Errno 9] Bad file descriptor\n\u003e\u003e\u003e ^C\nKeyboardInterrupt\n\u003e\u003e\u003e \nException ignored in: \u003c_io.TextIOWrapper name='\u003cstdout\u003e' mode='w' encoding='utf-8'\u003e\nOSError: [Errno 9] Bad file descriptor\nomarabdelgawad@omarabdelgawad:~$ \n```\nI also noticed that even with `-c \"script\"` it kind of silently crashes:\n```console\nomarabdelgawad@omarabdelgawad:~/my_workspace/RustPython$ cargo run --release -q -- -c \"import os; os.close(1);print('hello')\"\nomarabdelgawad@omarabdelgawad:~/my_workspace/RustPython$ \n```\nwhile CPython has the same behaviour:\n```console\nomarabdelgawad@omarabdelgawad:~/my_workspace/projects/github_repos/RustPython$ python -c \"import os; os.close(1);print('hello')\"\nTraceback (most recent call last):\n  File \"\u003cstring\u003e\", line 1, in \u003cmodule\u003e\nOSError: [Errno 9] Bad file descriptor\nException ignored in: \u003c_io.TextIOWrapper name='\u003cstdout\u003e' mode='w' encoding='utf-8'\u003e\nOSError: [Errno 9] Bad file descriptor\n```\n","author":{"url":"https://github.com/omar-abdelgawad","@type":"Person","name":"omar-abdelgawad"},"datePublished":"2025-09-12T20:30:45.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":2},"url":"https://github.com/6146/RustPython/issues/6146"}