[Cbe-oss-dev] [PATCH 1/2] [manpages] spufs.7: clarify ibox description

[Jeremy Kerr]

Add a little information about the differences to mbox

Signed-off-by: Jeremy Kerr <jk at ozlabs.org>

---

 spufs.7 |   13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

Index: manpages/spufs.7
===================================================================
--- manpages.orig/spufs.7
+++ manpages/spufs.7
@@ -198,9 +198,18 @@ the data buffer and the value four is re
 .I /ibox
 The second SPU-to-CPU communication mailbox.
 This file is similar to the first mailbox file, but can be read
-in blocking I/O mode, thus
+in blocking I/O mode, thus calling
+.BR read (2)
+on an open
+.I ibox
+file will block until the SPU has written data to its interrupt mailbox
+channel (unless the file has been opened with
+.BR O_NONBLOCK ,
+see below). Also,
 .BR poll (2)
-and similar system calls can be used to monitor this file.
+and similar system calls can be used to monitor for the presence
+of mailbox data.
+
 The possible operations on an open
 .I ibox
 file are: