mirror of https://github.com/mkerrisk/man-pages
readv2: Note preadv2(..., RWF_NOWAIT) bug in BUGS section
To save the next person before they fall foul of it. See <https://lore.kernel.org/linux-fsdevel/fea8b16d-5a69-40f9-b123-e84dcd6e8f2e@www.fastmail.com/T/#u> and <https://github.com/tokio-rs/tokio/issues/3803> for more information. Signed-off-by: Will Manley <will@williammanley.net> Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com> Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
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man2/readv.2
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man2/readv.2
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@ -243,7 +243,9 @@ If some data was successfully read, it will return the number of bytes read.
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If no bytes were read, it will return \-1 and set
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.IR errno
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to
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.BR EAGAIN .
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.BR EAGAIN
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(but see
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.BR BUGS ")."
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Currently, this flag is meaningful only for
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.BR preadv2 ().
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.TP
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@ -425,6 +427,13 @@ iov[1].iov_len = strlen(str1);
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nwritten = writev(STDOUT_FILENO, iov, 2);
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.EE
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.in
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.SH BUGS
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Linux v5.9 and v5.10 have a bug where
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.BR preadv2()
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with the
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.BR RWF_NOWAIT
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flag may return 0 even when not at end of file. See
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https://lore.kernel.org/linux-fsdevel/fea8b16d-5a69-40f9-b123-e84dcd6e8f2e@www.fastmail.com/T/#u
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.SH SEE ALSO
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.BR pread (2),
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.BR read (2),
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