attr_changed

The attr_changed entry point is called when a resource attribute is modified, and only if that resource is registered with the agent framework for notification. See the primitives VCSAgRegister and VCSAgUnregister for details. To register automatically, see RegList. This entry point receives as input the resource name registered with the agent framework for notification, the name of the changed resource, the name of the changed attribute, and the new attribute value. It does not return a value. This entry point provides a way to respond to resource changes. Most agents do not require this functionality and will not implement this entry point.

open

The open entry point is called when the VCS agent starts managing a resource; for example, when the agent starts, or when the value of the Enabled attribute is changed from 0 to 1. It receives a resource name and ArgList attribute values as input and returns no value. This entry point typically initializes the resource.

When a VCS agent is started, the open entry point of each resource is guaranteed to be called before its online, offline, or monitor entry points are called. This allows you to include initializations for specific resources. Most agents do not require this functionality and will not implement this entry point.

close

The close entry point is called when the VCS agent stops managing a resource. For example, it is called when the value of the Enabled attribute is changed from 1 to 0. It receives a resource name and ArgList attribute values as input and returns no value. This entry point typically deinitializes the resource if implemented. Most agents do not require this functionality and will not implement this entry point.

shutdown

The shutdown entry point is called before the VCS agent shuts down. It receives no input and returns no value. Most agents do not require this functionality and will not implement this entry point.