auth_open, auth_call, auth_challenge, auth_check_change, auth_check_expire, auth_clean, auth_close, auth_clrenv, auth_clroption, auth_clroptions, auth_getitem, auth_getpwd, auth_getstate, auth_getvalue, auth_set_va_list, auth_setdata, auth_setenv, auth_setitem, auth_setoption, auth_setpwd, auth_setstate (3) - interface to the BSD Authentication system
check_expire (3) - check for password expiration