Signed-off-by: Christoph Hellwig <hch@xxxxxx> --- Changes since V1: - better wording provided by Matthew Wilcox man2/readv.2 | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/man2/readv.2 b/man2/readv.2 index 831cf6260..880435edf 100644 --- a/man2/readv.2 +++ b/man2/readv.2 @@ -232,6 +232,25 @@ This flag is meaningful only for .BR pwritev2 (), and its effect applies only to the data range written by the system call. .\" commit e864f39569f4092c2b2bc72c773b6e486c7e3bd9 +.TP +.BR RWF_NOWAIT " (since Linux 4.14)" +Do not wait for data which is not immediately available. +If this flag is specified the +.BR preadv2 () +system call will return instantly if it would have to read data from +the backing storage or wait for a lock. +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 . +This flag is meaningful only for +.BR preadv2 () +at the moment. +.\" commit 3239d834847627b6634a4139cf1dc58f6f137a46 +.\" commit 91f9943e1c7b6638f27312d03fe71fcc67b23571 + + .SH RETURN VALUE On success, .BR readv (), -- 2.14.2
