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mq_overview.7: Document /proc/sys/fs/mqueue/msgsize_default 

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
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Michael Kerrisk 2013-03-17 15:34:49 +01:00
parent 8ebedd6c29
commit 247d9cfdcf
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@ -198,6 +198,33 @@ since Linux 3.5,
.\" commit 5b5c4d1a1440e94994c73dddbad7be0676cd8b9a .\" commit 5b5c4d1a1440e94994c73dddbad7be0676cd8b9a
it is 65,536. it is 65,536.
.TP .TP
.IR /proc/sys/fs/mqueue/msgsize_default " (since Linux 3.5)"
This file defines the value used for a new queue's
.I mq_msgsize
setting when the queue is created with a call to
.BR mq_open (3)
where
.I attr
is specified as NULL.
The default value for this file is 8192.
The minimum and maximum are as for
.IR /proc/sys/fs/mqueue/msgsize_max .
If
.IR msgsize_default
exceeds
.IR msgsize_max ,
a new queue's default
.I mq_msgsize
value is capped to the
.I msgsize_max
limit.
Up until Linux 2.6.28, the default
.I mq_msgsize
was 8192;
from Linux 2.6.28 to Linux 3.4, the default was the value defined for the
.I msgsize_max
limit.
.TP
.I /proc/sys/fs/mqueue/msgsize_max .I /proc/sys/fs/mqueue/msgsize_max
This file can be used to view and change the ceiling on the This file can be used to view and change the ceiling on the
maximum message size. maximum message size.