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Re: [lwip-users] using loopback

From: address@hidden
Subject: Re: [lwip-users] using loopback
Date: Fri, 06 Jun 2008 16:46:01 +0200
User-agent: Thunderbird (Macintosh/20080421)

I don't think I fully understand what you want to achieve: do you want to check if your an ethernet interface is up or if a thread is running? If you want to check the ethernet interface, loopif.c won't help you much: it is designed to be an additional lwip netif that passes packets to/from However, there is some work going on to get loopif functionality into _all_ netifs, but that is not supported in 1.3.0 and it might take a while until it is finished in CVS.


Ben Bobbitt schrieb:

I’m trying to use a loopback mechanism on a periodic basis as a way of checking that an interface is still up and running. It appears that loopback capability is included in the loopif.c module with the LWIP_HAVE_LOOPIF option in opt.h set... however, I’m not clear on how one would actually use that. Does the netif that you want to periodically test with a loopback message have to be initialized under a new model? I’m using the netconn api, and I simply want to have another thread periodically send a ping to the port that another thread is listening to – but since it’s a blocking read, I can’t really test that the thread is still up unless he receives data. Hopefully that makes sense.

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