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From: | address@hidden |
Subject: | Re: [lwip-users] Setting source port number for UDP send |
Date: | Fri, 11 Dec 2009 08:24:38 +0100 |
User-agent: | Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; de; rv:1.9.1.5) Gecko/20091204 Thunderbird/3.0 |
Marco Jakobs wrote:
Thanks for your thoughts, David!BIG FAT WARNING! This is *totally* unsupported! Doing this, you risk: a) threading issues: the raw API structs and functions may only be used from tcpip_thread, while you are changing a raw API struct from your application thread (the udp pcb). b) The members of both struct netconn as well as struct udp_pcb are *not* part of the public API, meaning they are bound to change without you noticing (and without us announcing it). You can access them, I know, but that doesn't mean you should use them like that. Once you leave lwIP and work with another stack (although that will never be the case, I hope *g*), you face the same problem again. Therefore, you can just do it right now and use bind() (whether it be lwip_bind() for sockets, netconn_bind() for netconns or udp_bind() for raw API udp pcbs). David suggested the correct functions, so no need to mess around in lwIP internal structs. Simon |
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