[PATCH] readv.2: document RWF_NOWAIT
From: Christoph Hellwig <hidden>
Date: 2017-10-29 08:40:29
Also in:
linux-fsdevel
Subsystem:
the rest · Maintainer:
Linus Torvalds
Signed-off-by: Christoph Hellwig <redacted> --- man2/readv.2 | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+)
diff --git a/man2/readv.2 b/man2/readv.2
index 831cf6260..21d82849e 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)" +Dot not wait for data when it cannot be instantly retreived. If this flag +is specified the +.BR preadv2 () +system call will return instantly when it would have to read data from +the backing storage or wait for a lock. Instead it will return -1 and set +.I errno +to +.BR EAGAIN +if no data could be read, or return less bytes than requested if some data +could be read. +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
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