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Re: [lwip-users] mem alignment issue when updating to Rev 1.4.1

From: tm264
Subject: Re: [lwip-users] mem alignment issue when updating to Rev 1.4.1
Date: Thu, 21 Aug 2014 12:04:13 +0200

Thanks for your answer.

Sorry, it's an LWIP_ERROR not a  LWIP_ASSERT.
I found this in sockets.c line 


  /* check size, familiy and alignment of 'name' */
  LWIP_ERROR("lwip_bind: invalid address", ((namelen == sizeof(struct sockaddr_in)) &&
             ((name->sa_family) == AF_INET) && ((((mem_ptr_t)name) % 4) == 0)),
             sock_set_errno(sock, err_to_errno(ERR_ARG)); return -1;);

and line 


 LWIP_ERROR("lwip_sendto: invalid address", (((to == NULL) && (tolen == 0)) ||
             ((tolen == sizeof(struct sockaddr_in)) &&
             ((to->sa_family) == AF_INET) && ((((mem_ptr_t)to) % 4) == 0))),
             sock_set_errno(sock, err_to_errno(ERR_ARG)); return -1;);

Ignoring that results in failures. E.g. connecting with TCP is impossible. 
Unfortunately our very old compiler doesn't support alignment 4 and update for compiler is not allowed in the moment.

But if your answer is "no" I assume that I can use alignment 2 in general and alignment 4 especially for this code area.

In the moment I'm fighting with damaged elements in memp pool but I think root cause for that is anywhere else.

I wish to have someone here with deeper lwip knowledge. I would pay for help;-)

Regards Thomas

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