Re: [lwip-users] question about compile minimal under Fedora 2

[江旭志 Shu-chih Chiang]

hi,

I thank you for your patient and clear explanation. That instill me with correct concept and give me right direction instantly.

 

I employed the lwip0.7.2 version, so I could build the minimal project and ran successful.

And thank for people who maintenance this project.

 

 

Jim Gibbons wrote:

I was hoping that you would get a more expert opinion than mine, but I haven't seen any, so I guess mine will have to serve.

It looks to me as though your model for the use of lwIP relates to an older version of lwIP.  etharp_ip_input used to return NULL always.  etharp_arp_input used to return a pbuf if it needed to have an arp output packet transmitted. 

In 1.1.0, someone modified etharp, so that it would return void from etharp_ip_input and etharp_arp_input.  etharp_ip_input probably should have been that way all along.  etharp_arp_input was perfectly capable of calling the output function itself, since it had a netif.  It all makes more sense the way it is now, but it does make some old code implementations obsolete