An audit log is a file containing historical information about the operations performed on OpenTP1 programs by system developers, operators, and users, together with the program behavior triggered by those operations.

In OpenTP1, an entry is output to the audit log when an operation is executed on a UAP, or when internal processing takes place in a UAP. To acquire user-specified audit log data, call the function dc_log_audit_print() from the UAP.

The figure below shows the flow of collecting an audit log from UAPs.

Figure 2-52 Outline of audit logging from UAPs

The table below lists the items entered in an audit log file and describes their content. The items that can be specified from the UAP are the message ID, source component, event type, event result, action information, and comment.

Table 2-3 Items output to audit log file

Specified by	Item	Output length (max. bytes)	Description
Items specifiable from a UAP	Message ID	11	The ID of the audit log entry
	Source component	3	The name of the component in which the event occurred. The source component is output in the format *AA, where AA is the value specified by the function dc_log_audit_print().
	Event type	32	The event category
	Event result	10	The result of the event
	Action information	32	The action initiated on the object by the subject who caused the event (Refer/Add/Update/Delete etc.)
	Comment	1024	A comment describing the nature of the event
Items specified automatically by OpenTP1	Header information	12	Header information in the audit log
	Sequence number	7	The sequence number of the entry
	Date and time	29	The date and time when the entry was logged
	Source program	32	The name of the programin which the event occurred
	Source process ID	10	The ID of the process in which the event occurred
	Source location	255	Information identifying the host where the event occurred
	Subject ID information	256	Information identifying the user who caused the event
	Object information	256	The service name Output only when an entry is logged from within a service function; not output otherwise.
	Object location information	64	The user server name
	Request source host	255	Information identifying the host that sent the request, when the event involves the linking of multiple programs Not output if there is no information about the request source host.
	Location ID information	64	The path specified in the DCDIR environment variable