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

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
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Michael Kerrisk 2013-03-17 15:32:27 +01:00
parent 40502a2842
commit 8ebedd6c29
1 changed files with 27 additions and 0 deletions
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@ -139,6 +139,33 @@ to link against the real-time library,
The following interfaces can be used to limit the amount of
kernel memory consumed by POSIX message queues:
.TP
.IR /proc/sys/fs/mqueue/msg_default " (since Linux 3.5)"
This file defines the value used for a new queue's
.I mq_maxmsg
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 10.
The minimum and maximum are as for
.IR /proc/sys/fs/mqueue/msg_max .
If
.IR msg_default
exceeds
.IR msg_max ,
a new queue's default
.I mq_maxmsg
value is capped to the
.I msg_max
limit.
Up until Linux 2.6.28, the default
.I mq_maxmsg
was 10;
from Linux 2.6.28 to Linux 3.4, the default was the value defined for the
.I msg_max
limit.
.TP
.I /proc/sys/fs/mqueue/msg_max
This file can be used to view and change the ceiling value for the
maximum number of messages in a queue.