[Tipc-discussion] topology events

[Daniel M. <da...@os...>]

Hi Jon,

I looking over the changes to the topology events and had some
questions:

old way was:

ioctl(tipc_fd, NETWORK_SUBSCRIBE, 0);

poll() looking for NETWORK_EVENT
ioctl(tipc_fd, GET_NETWORK_EVENT, &netw_subscr)

	which return a node_id and up/down indication

New way is:

ioctl(tipc_fd, TIPC_SUBSCRIBE, &tipc_subscr)

	with 

	tipc_subscr.seq.type = 0
	tipc_subscr.seq.lower = tipc_addr(zone, cluster, 0);
	tipc_subscr.seq.upper = tipc_addr(zone, cluster, 0xfff);
	tipc_subscr.timeout = TIPC_WAIT_FOREVER;
	tipc_subscr.usr_handle = "abc";

poll() looking for TIPC_TOPOLOGY_EVENT
ioctl(tipc_fd, TIPC_GET_EVENT, &tipc_event);

	on return:

	tipc_event.event = TIPC_PUBLISHED (node joined?)
			   TIPC_WITHDRAWN (node died/left?)
			   TIPC_SUBSCR_TIMEOUT

	tipc_event.port.node = node_who_joined_or_left

Do I have this correct?  Do the other fields mean anything?

Also in manager.c, the mng_cmd_event() function has

	case TIPC_SUBSCRIBE:

How is this used?  Can you subscribe to events on the management port?
How are results returned?
	
Thanks,

Daniel