Hal> It appears to me that there is nothing that enforces the man
Hal> page behavior above in Linux so this is a "convention". Is
Hal> this something we can take advantage of or do we need to
Hal> require the additional call to get the buffer length ?
Something I was thinking a little while ago was that the character
device interface for userspace MADs might have been a mistake. Having
a new datagram socket family would solve this problem quite nicely --
a consumer could pass MSG_PEEK and/or MSG_TRUNC to recv() to get the
true length of a datagram. However it's a little tricky to see a
really clean way for userspace to use this to handle arbitrary sized
RMPP receives.
- R.
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