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OSX 10.14 Mojave - man page for au_domain (mojave section 3)

AU_BSM_TO_DOMAIN(3)					   BSD Library Functions Manual 				       AU_BSM_TO_DOMAIN(3)

NAME
au_bsm_to_domain, au_domain_to_bsm -- convert between BSM and local protocol domains
LIBRARY
Basic Security Module Library (libbsm, -lbsm)
SYNOPSIS
#include <bsm/libbsm.h> int au_bsm_to_domain(u_short bsm_domain, int *local_domainp); u_short au_domain_to_bsm(int local_domain);
DESCRIPTION
These interfaces may be used to convert between the local and BSM protocol domains. The au_bsm_to_domain() function accepts a BSM domain, bsm_domain, and converts it to a local domain, such as those passed to socket(2), that will be stored in the integer pointed to by local_domainp if successful. This call will fail if the BSM domain cannot be mapped into a local domain, which may occur if the socket token was generated on another operating system. The au_domain_to_bsm() function accepts a local domain, and returns the BSM domain for it. This call cannot fail, and instead returns a BSM domain indicating to a later decoder that the domain could not be encoded.
RETURN VALULES
On success, au_bsm_to_domain() returns 0 and a converted domain; on failure, it returns -1 but does not set errno(2).
SEE ALSO
au_bsm_to_socket_type(3), au_socket_type_to_bsm(3), au_to_socket_ex(3), libbsm(3)
HISTORY
au_bsm_to_domain() and au_domain_to_bsm() were introduced in OpenBSM 1.1.
AUTHORS
These functions were implemented by Robert Watson under contract to Apple Inc. The Basic Security Module (BSM) interface to audit records and audit event stream format were defined by Sun Microsystems.
BSD
December 28, 2008 BSD