René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"pipe test failures on some  Linux configurations  ","articleBody":"# Bug report\r\n\r\nOn Linux systems, when configured with a default pipe capacity of 4096, the following test fail:\r\n- test_fcntl.test_fcntl_f_pipesize\r\n- test_subprocess.test_pipesizes\r\n\r\nFrom a recent `fcntl(2)` Linux [man page](https://man7.org/linux/man-pages/man2/fcntl.2.html#:~:text=Attempts%20to%20set%20the%20pipe%20capacity%20below%20the%0A%20%20%20%20%20%20%20%20%20%20%20%20%20%20page%20size%20are%20silently%20rounded%20up%20to%20the%20page%20size.):\r\n\r\n```\r\nF_SETPIPE_SZ:\r\n...\r\nAttempts to set the pipe capacity below the page size are silently rounded up to the page size.\r\n```\r\n\r\nThere's a check that attempts to skip the tests if the pipe capacity is [512 bytes](https://github.com/python/cpython/blob/6a5104f4fa83ed08fe31f712757dddabfede394c/Lib/test/test_fcntl.py#L202), but that's less than the smallest page size on x86.\r\n\r\nSince this feature appears to be Linux specific, the check should:\r\n\r\n1) Use `os.sysconf('SC_PAGESIZE')` as a minimum\r\n2) Fix the typos (\"SkitTest\") in [test_fcntl_f_pipesize](https://github.com/python/cpython/blob/6a5104f4fa83ed08fe31f712757dddabfede394c/Lib/test/test_fcntl.py#L203) and [test_pipesizes](https://github.com/python/cpython/blob/f6dd14c65336cda4e2ebccbc6408dfe3b0a68a34/Lib/test/test_subprocess.py#L715)\r\n\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-102119\n* gh-102121\n* gh-102122\n* gh-102163\n* gh-102365\n* gh-102455\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/colesbury","@type":"Person","name":"colesbury"},"datePublished":"2022-08-04T19:36:29.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":3},"url":"https://github.com/95672/cpython/issues/95672"}