rtnl_link_get returns NULL for USB wireless indexes if it has ever been unplugged about libnl HOT 6 CLOSED

Did you resync the cache after replugging the interface?

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That seemed to do it, thanks!

I had no idea about the resync function until I dove into the source looking for it. Is there a note in the docs somewhere about needing to use it if you have hotplug devices?

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Unfortunately the caching system is not very well documented at this point.

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Actually I was wrong... it's still not working. I'm doing rtnl_cache_resync(sock, link_cache, NULL, NULL) right after I allocate the link cache, is that the correct way to use it? Any ideas?

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You have two options:
a) Manually resync the cache periodically to update your local cache to the latest state in the kernel. Caches do not automatically receive updates.
b) Use the cache manager to allocate and manage the cache [0] which will listen for notifications such as new links appearing, links disappearing and updating the cache as needed.

[0] http://www.infradead.org/~tgr/libnl/doc/core.html#_cache_manager

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So what is the preferred way to manually resync the cache?

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