James Ots wrote:
>
> When using the Sockets function 'recv', if I give it a length
> parameter of 30001 it returns an error of EINVAL, although 30000 is
> fine.
>
> Is this number defined somewhere? It doesn't seem to be in the
> documentation, and I haven't found any reference to it on the
> internet. I'm trying to write portable code, so I don't want to use a
> hard code

It's documented in the send() section of the Berkeley Sockets manual:

http://docs.hp.com/mpeix/onlinedocs/32650-90372/00/00/15-con.html

For being portable, you might try calling getsockopt() to read the values of
SO_RCVBUF and SO_SNDBUF in order to determine your maximum buffer sizes.
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