[9fans] changing close()

[Ronald G Minnich <rminnich@lanl.gov>]

I am wondering about addressing the close() problem, which is that you 
can't close() the send side of a bidi fd without closing the receive 
side too. This has been pointed out as an issue to me w.r.t. TCP sockets 
and such things in which you can't really communicate a zero-byte-write, 
as you could in IL.

BSD hacked around this early (as in 25 years ago) with shutdown(), but
what about having close mode that mirrors open mode:

close(fd) becomes close(fd, ORDWR)

then you can close(fd, OWR) and close(fd, ORD)

Is this a terrible idea? (I'm trying to address the lack of technical 
discussion mentioned  an earlier note :0)

ron