[Libevent-users] remove some bytes from the end of the evbuffer

[谷天仁 <wsgtrsys@xxxxxxxxx>]

I now use libevent to develop a network program, which used a evbuffer
buffer function.
The currently evbuff only evbuffer_drain and evbuffer_remove, are
removed from the head of the buffer data.
I need a very important functions: remove some bytes from the end of the buffer.
That is the sk_buff like linux kernel as a function of: skb_trim.
It describes: http://www.skbuff.net/skbbasic.html

I hope that the developers can add this function
Thanks!
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