[riot-notifications] [RIOT-OS/RIOT] sys/posix/socket: implement MSG_PEEK for recvfrom (#16850)

chrysn notifications at github.com
Mon Sep 20 11:35:00 CEST 2021

I don't understand how the 16739 comment relates. Right now we have

1. the GNRC packet buffers
2. the per-socket reassembled stream

This commit adds on top of this a

3. the per-socket peeked data that was moved over

Now what comes out of 16739 might smush 1 and 2 into the same thing, but either way, a read that does not advance the read cursor (inside 1 or the combined 1+2 pktbuf chain) would achieve the same without an additional buffer (and, above that, do backpressure better).

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