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uucore: splice fast-path for head -c & preliminary for dd, tail, split#11844

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oech3 wants to merge 1 commit intouutils:mainfrom
oech3:splice-n
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uucore: splice fast-path for head -c & preliminary for dd, tail, split#11844
oech3 wants to merge 1 commit intouutils:mainfrom
oech3:splice-n

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@oech3 oech3 commented Apr 15, 2026 •
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Closes #11843 Closes #11620 Fixes #11777
This should help achieving same perf with

$ cat /tmp/huge|pv>/dev/null
^C.8GiB 0:00:01 [35.8GiB/s]

at 3 utils in the future.

@oech3 oech3 force-pushed the splice-n branch 4 times, most recently from 778ff1a to 08af0e0 Compare April 15, 2026 21:08
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github-actions bot commented Apr 15, 2026 •
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GNU testsuite comparison:

GNU test failed: tests/tail/retry. tests/tail/retry is passing on 'main'. Maybe you have to rebase?
Skipping an intermittent issue tests/date/date-locale-hour (passes in this run but fails in the 'main' branch)
Note: The gnu test tests/seq/seq-epipe is now being skipped but was previously passing.

@oech3 oech3 marked this pull request as ready for review April 15, 2026 21:36
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@oech3 oech3 force-pushed the splice-n branch 3 times, most recently from a70c6cf to eff6fd9 Compare April 16, 2026 07:41
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@oech3 oech3 mentioned this pull request Apr 16, 2026
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uucore, head, tail, dd, split: Introduce a function to splice() N bytes via broker pipe head -c is incorrect with FUSE fs with fake stat

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