On Mon, 12 Sep 2005 15:25:26 -0700 Wes wrote:
WH> >>>>> On Sat, 10 Sep 2005 17:32:12 +0200, Magnus Fromreide
WH> >>>>> <[EMAIL PROTECTED]> said:
WH>
WH> Magnus> snmp_sess_add_ex(netsnmp_session* sess, netsnmp_transport*
WH> Magnus> trans, ...)
WH>
WH> I'd respond to that comment, but it's been a while since I looked at
WH> that portion of the code...
WH>
WH> Magnus> snmp_register_callback(int, int, new_callback, void* arg)
WH>
WH> Magnus> The arg parameter is freed when clear_callback is called but
WH> Magnus> not under any other circumstances. Who owns that pointer? The
WH> Magnus> implication of this one is the infamous
WH>
WH> Callbacks, however, are more my bag (baby). The arg is a magic
WH> pointer supplied by the caller so the library can *never* free it
WH> since it doesn't know how (IE, it doesn't know what it is).
Ummm...
callback.c Revision 5.1
Wed Jul 2 20:20:56 2003 UTC (2 years, 2 months ago) by hardaker
Patch #724925 from Peter Warasin to free lots of memory for a really clean
shutdown
This patch creates the clear_callback() function, which basically loops
through the callback lists, freeing the client args.
WH> What should be done, if you want proper memory controlled programming,
WH> is that everything that registers a callback with an arg would have to
WH> save the returned magic number and use that later to unregister it and
WH> then free the pointer.
Or add a function pointer to a release routine that can be called during
shutdown.
--
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Robert Story; NET-SNMP Junkie
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