NOF indications

A NOF application can use the REGISTER_INDICATION_SINK verb to request information about changes to the CS Linux configuration or to the status of its resources. CS Linux then sends an indication message to the application each time a change occurs.

For more details of the indications that an application can request, see NOF Indications.

Except for CONFIG_INDICATION, NOF_STATUS_INDICATION, and SNA_NET_INDICATION, each indication is returned when a resource of the specified type changes its status. For example, if the application registers for DLC indications, CS Linux sends a DLC_INDICATION message to the application each time a DLC becomes active or inactive.

An indication returns summary information about the change that has occurred. If necessary, the application can then issue the appropriate QUERY_* verb to obtain more detailed information.

If the local node is short of resources, it can temporarily suppress indications and not send them to applications. When the resource shortage condition clears, and the local node subsequently generates an indication of a type that it has previously suppressed, it then sets a parameter on the indication to inform the application that one or more previous indications of this type have been lost. The application should then issue QUERY_* verbs for the appropriate resource type to determine the current state of resources.

For more information about registering to receive indications, see REGISTER_INDICATION_SINK. For more information about individual indications, see NOF Indications.