In addition to symbols withdrawn from the SUSv3 namespace, a number of symbols have been marked obsolete in the POSIX base or added to the Legacy Option for XSI that may be removed from the Single UNIX Specification in a future version.
Obsolescent: bsd_signal(), gethostbyaddr(), gethostbyname(), h_errno, pthread_attr_getstackaddr(), pthread_attr_setstackaddr(), scalb(), ualarm(), usleep(), vfork()
Legacy Option bcmp(), bcopy(), bzero(), ecvt(), fcvt(), ftime(), gcvt(), getwd(), index(), mktemp(), rindex(), utimes(), wcswcs()