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The libkadm5 functions hdb_open() and close around all HDB ops. This meant the previous implementation of kadm5_lock() and unlock would always result in a core dump. Now we hdb_open() for write in kadm5_lock() and hdb_close() in kadm5_unlock(), with all kadm5_s_*() functions now not opening nor closing the HDB when the server context keep_open flag is set. Also, there's now kadmin(8) lock and unlock commands. These are there primarily as a way to test the kadm5_lock()/unlock() operations, but MIT's kadmin.local also has lock/unlock commands, and these can be useful for scripting (though they require much care).
Heimdal is a Kerberos 5 implementation. For information how to install see <http://www.h5l.org/compile.html>. There are briefer man pages for most of the commands. Bug reports and bugs are appreciated, see more under Bug reports in the manual on how we prefer them: <heimdal-bugs@h5l.org>. For more information see the web-page at <http://www.h5l.org/> or the mailing lists: heimdal-announce@sics.se low-volume announcement heimdal-discuss@sics.se high-volume discussion send a mail to heimdal-announce-request@sics.se and heimdal-discuss-request@sics.se respectively to subscribe.