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<A NAME="PAGENUM-1144"><P>Page 1144</P></A>
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<PRE>
!load!load hiload!loadavg!lt!5!go!
:hiload:+ load:loadavg:gt:8:throttle:loadav
/load/+/loadavg/ge/6/pause/loadav
</PRE>
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<P>The final line causes the server to be paused if
innwatch is in the run state and the load average rises to, or above, six.
The state is set to load when this happens. The previous line causes the server to be throttled when
innwatch is in the run or load state, and the load average rises above eight. The state is set to
hiload when this happens. Note that innwatch can switch
the server from paused to throttled if the load average rises from below six to between six and seven and then to above eight.
The first line causes the server to be sent a go command if
innwatch is in the load or hiload state and the load average drops
below five.
</P>
<P>Note that all three lines assume a mythical command
loadavg that is assumed to print the current load average as an
integer. In more practical circumstances, a pipe of
uptime into awk is more likely to be useful.
</P>
<P><B>
BUGS
</B></P>
<P>This file must be tailored for each individual site; the sample supplied is truly no more than a sample. The file should
be ordered so that the more common problems are tested first.
</P>
<P>The run state is not actually identified by the label with that three letter name, and using it will not work as expected.
</P>
<P>Using an "unusual" character for the delimiter such as
(, *, &, "", and the like is likely to lead to obscure and
hard-to-locate bugs.
</P>
<P><B>
HISTORY
</B></P>
<P>Written by (kre@munnari.oz.au) for InterNetNews.
</P>
<P><B>
SEE ALSO
</B></P>
<P>innd(8), ctlinnd(8), news.daily(8)
</P>
<H3><A NAME="ch05_ 27">
ipc
</A></H3>
<P>ipc—System V interprocess communication mechanisms.
</P>
<P><B>
SYNOPSIS
</B></P>
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<PRE>
# include <sys/types.h>
# include <sys/ipc.h>
# include <sys/msg.h>
# include <sys/sem.h>
# include <sys/shm.h>
</PRE>
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<P><B>
DESCRIPTION
</B></P>
<P>The manual page refers to the Linux implementation of the System V interprocess communication mechanisms:
message queues, semaphore sets, and shared memory segments. In the following, the word
resource means an instantiation of one among such mechanisms.
</P>
<P><B>
Resource Access Permissions
</B></P>
<P>For each resource, the system uses a common structure of type
struct ipc_perm to store information needed in
determining permissions to perform an ipc operation. The
ipc_perm structure, defined by the
<sys/ipc.h> system header file, includes the following members:
</P>
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<PRE>
ushort cuid; /* creator user id */
ushort cgid; /* creator group id */
ushort uid; /* owner user id */
ushort gid; /* owner group id */
ushort mode; /* r/w permissions */
</PRE>
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