[Bug network/18665] In send_dg, the recvfrom function is NOT always using the buffer size of a newly created buffer.

["rhollida at ciena dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=18665

--- Comment #5 from Robert <rhollida at ciena dot com> ---
I assume this is happening because this code was never sufficiently tested with
large packets. 

I had done some statistics which show typical packet lengths received for DNS
queries. 

Received packet lengths:
122, 128, 47, 80, 59, 73, 226, 50, 161 

It looks like the code that allocates more buffer space starting on line
1271, is not used much, so probably does not get a lot of testing, because most
of the time the default buffer of 2048 bytes is less than the largest packet I
received of 161 bytes.

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