A number of derived types now represent 64-bit quantities in the 64-bit application compilation environment. This change does not affect 32-bit applications; however, any 64-bit applications that consume or export data described by these types need to be re-evaluated. For example, in applications that directly manipulate the utmp(4) or utmpx(4) files, do not attempt to directly access these files. For correct operation in the 64-bit application environment,use the getutxent(3C) and related family of functions instead.