Hello Will and Alex, On 7/28/21 10:19 PM, Alejandro Colomar wrote: > From: Will Manley <will@xxxxxxxxxxxxxxxxx> > > To save the next person before they fall foul of it. See > <https://lore.kernel.org/linux-fsdevel/fea8b16d-5a69-40f9-b123-e84dcd6e8f2e@xxxxxxxxxxxxxxxx/T/#u> > and <https://github.com/tokio-rs/tokio/issues/3803> for more information. > > Signed-off-by: Will Manley <will@xxxxxxxxxxxxxxxxx> > Signed-off-by: Alejandro Colomar <alx.manpages@xxxxxxxxx> Patch applied, but see my follow-up mail. Thanks, Michael > --- > man2/readv.2 | 11 ++++++++++- > 1 file changed, 10 insertions(+), 1 deletion(-) > > diff --git a/man2/readv.2 b/man2/readv.2 > index df42cf830..3355fa9d7 100644 > --- a/man2/readv.2 > +++ b/man2/readv.2 > @@ -243,7 +243,9 @@ If some data was successfully read, it will return the number of bytes read. > If no bytes were read, it will return \-1 and set > .IR errno > to > -.BR EAGAIN . > +.BR EAGAIN > +(but see > +.BR BUGS ")." > Currently, this flag is meaningful only for > .BR preadv2 (). > .TP > @@ -425,6 +427,13 @@ iov[1].iov_len = strlen(str1); > nwritten = writev(STDOUT_FILENO, iov, 2); > .EE > .in > +.SH BUGS > +Linux v5.9 and v5.10 have a bug where > +.BR preadv2() > +with the > +.BR RWF_NOWAIT > +flag may return 0 even when not at end of file. See > +https://lore.kernel.org/linux-fsdevel/fea8b16d-5a69-40f9-b123-e84dcd6e8f2e@xxxxxxxxxxxxxxxx/T/#u > .SH SEE ALSO > .BR pread (2), > .BR read (2), > -- Michael Kerrisk Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/ Linux/UNIX System Programming Training: http://man7.org/training/
