[2/2] Modify the pipe(2) manpage for notification queues

Commit Message

David Howells Aug. 24, 2020, 3:30 p.m. UTC

Modify the pipe(2) manual page to cover support for notification queues

Signed-off-by: David Howells <[e-mail]>
---

 man2/pipe.2 |   10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

Patch

diff --git a/man2/pipe.2 b/man2/pipe.2
index 117f8950c..c50b38530 100644
--- a/man2/pipe.2
+++ b/man2/pipe.2
@@ -146,6 +146,13 @@  referred to by the new file descriptors.
 Using this flag saves extra calls to
 .BR fcntl (2)
 to achieve the same result.
+.TP
+.B O_NOTIFICATION_PIPE
+This enables use of the pipe as a notification transport (see
+.BR watch_queue (7)
+for more information).  When a pipe is in this mode, it may not be spliced as
+the insertion of notification messages into the pipe buffer can happen
+asynchronously and may cause splice to malfunction.
 .SH RETURN VALUE
 On success, zero is returned.
 On error, \-1 is returned,
@@ -292,4 +299,5 @@  main(int argc, char *argv[])
 .BR vmsplice (2),
 .BR write (2),
 .BR popen (3),
-.BR pipe (7)
+.BR pipe (7),
+.BR watch_queue (7)