In article <13459.932744143@coconut.itojun.org>,
 <tech-userlevel@netbsd.org> wrote:
>	UT_HOSTSIZE (/usr/include/utmp.h) is set to 16.  This is not possible
>	to put IPv6 numeric address into ut_host[].
>	IPv6 numeric is usually fit into 40 bytes, in worst case 46 bytes
>	including "\0".  Worst case is like follows:
>		1111:2222:3333:4444:5555:123.123.123.123
>
>	Queestion: is it possible for us to raise UT_HOSTSIZE to 46, or 40?
>
>	I suspect backward compatibility is the problem.  utmp files does not
>	have no file format version number info in it, so old and new version
>	of file cannot coexist.  Also, some of third-party application may
>	hardcode UT_HOSTSIZE, and they may have trouble parsing utmp files.
>	If UT_HOSTSIZE is decided in any of standards like POSIX
>	I should try to change the definition in that document first.
>	Let me know your opinions.

Yes, that is the problem. Please note that we did not change utmp, even
when that we allowed > 8 chars user names. Another interesting consideration
is to have a flag day and add all the svr4 gunk in it.

christos