Hi,
while implementing a reliable datagram protocol (PGM for what matters)
i am hitting a weird behaviour of sbflush().
The problem is, the protocol (at least, in my implementation)
allows the writing of zero-sized packets (essentially, just headers
and no payload) which are put in the socket buffer.
This results in some cases in sb_cc = 0, sb_mbcnt != 0, and this
condition causes sbflush to panic.
There is not an equivalent of this in TCP (which counts bytes, not
segments) or UDP (which allows zero-sized packets but bypasses the
socket buffer) so i am not sure if it is appropriate to "fix" sbflush()
so that it uses sbdroprecord() instead of sbdrop() in case of a
datagram protocol ?
cheers
luigi
-----------------------------------+-------------------------------------
Luigi RIZZO, lu...@iet.unipi.it . Dip. di Ing. dell'Informazione
http://www.iet.unipi.it/~luigi/ . Universita` di Pisa
TEL/FAX: +39-050-568.533/522 . via Diotisalvi 2, 56126 PISA (Italy)
http://www.iet.unipi.it/~luigi/ngc99/
==== First International Workshop on Networked Group Communication ====
-----------------------------------+-------------------------------------
To Unsubscribe: send mail to majord...@freebsd.org
with "unsubscribe freebsd-hackers" in the body of the message
