How the Monitor_start Method Works

The RGM calls the Monitor_start method to start the dns_probe method after the sample data service is brought online.

This section describes the major pieces of the Monitor_start method for the sample application. This section does not describe functionality that is common to all callback methods, such as the parse_args() function. This section also does not describe using the syslog() function. Common functionality is described in Providing Common Functionality to All Methods.

For the complete listing of the Monitor_start method, see Monitor_start Method Code Listing.

What the Monitor_start Method Does

This method uses the PMF (pmfadm) to start the probe.

Starting the Probe

The Monitor_start method obtains the value of the RT_basedir property to construct the full path name for the PROBE program. This method starts the probe by using the infinite retries option of pmfadm (-n -1, -t -1), which means that if the probe fails to start, the PMF tries to start it an infinite number of times over an infinite period of time.

# Find where the probe program resides by obtaining the value of the
# RT_basedir property of the resource.
RT_BASEDIR=`scha_resource_get -O RT_basedir -R $RESOURCE_NAME -G \
$RESOURCEGROUP_NAME`

# Start the probe for the data service under PMF. Use the infinite retries
# option to start the probe. Pass the resource name, type, and group to the
# probe program.
pmfadm -c $RESOURCE_NAME.monitor -n -1 -t -1 \
$RT_BASEDIR/dns_probe -R $RESOURCE_NAME -G $RESOURCEGROUP_NAME \
-T $RESOURCETYPE_NAME