[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [lwip-devel] pbuf_cat() does not update total_len

From: address@hidden
Subject: Re: [lwip-devel] pbuf_cat() does not update total_len
Date: Tue, 03 Feb 2015 20:46:16 +0100
User-agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:31.0) Gecko/20100101 Thunderbird/31.4.0

Laurenz Kamp wrote:
What confused me was that pbuf_cat() updates all tot_len fields in the first 
chain, but
not in the second. Wouldn't it be sufficient to only update the tot_len field 
in the first
pbuf of the first chain?

No, it wouldn't. tot_len is always the remaining length of the packet. That way you can just snip off the first pbuf in a chained packet, free it and be done. Without updating any fields of the remainder. The only place where this adds work is pbuf_cat(), but it makes the structure more fault proof.


reply via email to

[Prev in Thread] Current Thread [Next in Thread]