AU_PRESELECT(3BSM) Security and Auditing Library Functions AU_PRESELECT(3BSM)

au_preselect - preselect an audit event

cc [ flag... ] file... -lbsm  -lsocket   -lnsl   [ library... ]
#include <bsm/libbsm.h>
int au_preselect(au_event_t event, au_mask_t *mask_p, int sorf, int flag);

The au_preselect() function determines whether the audit event event is preselected against the binary preselection mask pointed to by mask_p (usually obtained by a call to getaudit(2)). The au_preselect() function looks up the classes associated with event in audit_event(5) and compares them with the classes in mask_p. If the classes associated with event match the classes in the specified portions of the binary preselection mask pointed to by mask_p, the event is said to be preselected.

The sorf argument indicates whether the comparison is made with the success portion, the failure portion, or both portions of the mask pointed to by mask_p.

The following are the valid values of sorf:


Compare the event class with the success portion of the preselection mask.


Compare the event class with the failure portion of the preselection mask.


Compare the event class with both the success and failure portions of the preselection mask.

The flag argument tells au_preselect() how to read the audit_event(5) database. Upon initial invocation, au_preselect() reads the audit_event(5) database and allocates space in an internal cache for each entry with malloc(3C). In subsequent invocations, the value of flag determines where au_preselect() obtains audit event information. The following are the valid values of flag:


Get audit event information by searching the audit_event(5) database.


Get audit event information from internal cache created upon the initial invocation. This option is much faster.

Upon successful completion,au_preselect() returns 0 if event is not preselected or 1 if event is preselected. If au_preselect() could not allocate memory or could not find event in the audit_event(5) database, −1 is returned.

file mapping audit class number to audit class names and descriptions


file mapping audit event number to audit event names, descriptions and associated audit classes

See attributes(7) for a description of the following attributes:

Interface Stability Stable
MT-Level MT-Safe

getaudit(2), au_open(3BSM), getauclassent(3BSM), getauevent(3BSM), malloc(3C), audit_class(5), audit_event(5), attributes(7)

The au_preselect() function is normally called prior to constructing and writing an audit record. If the event is not preselected, the overhead of constructing and writing the record can be saved.
March 6, 2017 OmniOS