Signed-off-by: Pavel Begunkov <asml.silence@xxxxxxxxx> --- man/io_uring_enter.2 | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/man/io_uring_enter.2 b/man/io_uring_enter.2 index 2ebc6e3..25fdc1e 100644 --- a/man/io_uring_enter.2 +++ b/man/io_uring_enter.2 @@ -1098,8 +1098,11 @@ Available since 5.19. Issue the zerocopy equivalent of a .BR send(2) system call. Similar to IORING_OP_SEND, but tries to avoid making intermediate -copies of data. Zerocopy execution is not guaranteed and it may fall back to -copying. +copies of data. Zerocopy execution is not guaranteed and may fall back to +copying. The request may also fail with +.B -EOPNOTSUPP, +for instance when a protocol doesn't support zerocopy in the first place, in +which case users are recommended to use copying sends instead. The .I flags -- 2.38.0
