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Re: [lwip-users] to free or not to free (pbuf_free in tcp_recv)

From: goldsimon
Subject: Re: [lwip-users] to free or not to free (pbuf_free in tcp_recv)
Date: Wed, 23 Jan 2019 15:42:29 +0100
User-agent: K-9 Mail for Android

Am 23. Januar 2019 15:05:06 MEZ schrieb address@hidden:
>I'm working with the lwIP 1.4.1 on a TI M4 platform with rawapi and I'm
>having trouble to understand the documentation correctly.
>In particular the callback for tcp_recv(). In the rawapi.txt is said 
>"If there are no errors and the callback function is to return ERR_OK,
>it must free the pbuf. 
>Otherwise, it must not  free the pbuf so that lwIP core code can store
>But in the echo example there is this part: 
>echo_recv() { 
>else if(err != ERR_OK)
>  {
>    /* cleanup, for unkown reason */
>    if (p != NULL)
>    {
>      es->p = NULL;
>      pbuf_free(p);
>    }
>    ret_err = err;
>  }
>The pbuf is freed AND the callback function returns an error. What
>happen with the pbuf if it is not freed?

Try updating to a more recent version. Besides getting so many bugs fixed, 
you'll see that the echo code has changed as well since 1.4.1... 


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