[zzzcpan]

Yeah, but there is still a little bit of explicit usage of recvfrom() with MSG_PEEK

https://codesearch.debian.net/search?q=recvfrom+.*+MSG_PEEK

And probably more implicit

https://codesearch.debian.net/search?q=recv+.*+MSG_PEEK

[ryan-c]

The use in wget seems a little scary.