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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"os.fstat() fails on FAT32 file system on Windows","articleBody":"# Bug report\n\n### Bug description:\n\nThis is Python 3.12.0 x64 running on Windows 11. On a FAT32 drive, I have a file `f.txt`.\n\n```python\n\u003e\u003e\u003e import os\n\u003e\u003e\u003e os.stat('f.txt')\nos.stat_result(st_mode=33206, st_ino=4194560, st_dev=1589430838, st_nlink=1, st_uid=0, st_gid=0, st_size=0, st_atime=1699419600, st_mtime=1699459266, st_ctime=1699459265)\n\u003e\u003e\u003e f = open('f.txt','rb')\n\u003e\u003e\u003e f.fileno()\n3\n\u003e\u003e\u003e os.fstat(f.fileno())\nTraceback (most recent call last):\n  File \"\u003cstdin\u003e\", line 1, in \u003cmodule\u003e\nOSError: [WinError 87] The parameter is incorrect\n```\n\nThis error does not occur with Python 3.11.6. I suspect that the issue was introduced with https://github.com/python/cpython/pull/102149. https://github.com/python/cpython/commit/6031727a37c6003f78e3b0c7414a0a214855dd08 provided a fix for `os.stat()`, but it seems that an equivalent bug exists for `os.fstat()`.\n\nI believe the fix would involve changing the line https://github.com/python/cpython/blob/74b868f636a8af9e5540e3315de666500147d47a/Python/fileutils.c#L1275C48-L1275C48 to account for the possibility that the file system does not support `FileIdInfo`.\n\n### CPython versions tested on:\n\n3.12\n\n### Operating systems tested on:\n\nWindows\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-112038\n* gh-112044\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/adang1345","@type":"Person","name":"adang1345"},"datePublished":"2023-11-08T16:21:35.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/111856/cpython/issues/111856"}