This is how my tcp-server deals with it
wait-ports: none
listen-port: open/no-wait/direct/binary tcp://:9999
wait-ports: [ listen-port ]
forever [
; Perform asynch wait !!!
wait wait-ports
; Is port descriptor set ?
if not ( none? ( wait [ 0 listen-port ] ) ) [
; Add port to block
append wait-ports first listen-port
]
; Set scope of port checking
check-ports: next wait-ports
; Check port activity ?
while [ ( length? check-ports ) > 0 ] [
conn: first check-ports
; Is port still active ?
either query conn [
; Port active ... so check if any data to be read
either not ( none? ( wait [ 0 conn ] ) ) [
; Yes .. so determine size of data to be
read
readbuffer: copy #{}
readbuffer: copy conn
; If length is none? then connection has
been closed
either none? readbuffer [
; Close down port and tidy up
wait-ports block entry
close conn
remove check-ports
] [
; Is this NOT a HTTP request ?
either none? ( find readbuffer
"HTTP/1." ) [
; Remove data from port
clear conn
; Move onto next port
check-ports: next
check-ports
] [
; HTTP request so detrmine
what to do ...
; Remember it's a
non-persistent connection
; Tidy up
clear conn
close conn
]
; VIP - empty out buffer area !!!
clear readbuffer
] ; end of either none? readbuffer
] [
check-ports: next check-ports
]
] [
; Port is no longer active !
; tidy up
clear conn
close conn
remove check-ports
] ; end of query conn
] ; end of while ( length? ...
]
quit
-----Original Message-----
From: Maarten Koopmans [mailto:[EMAIL PROTECTED]]
Sent: 09 October 2001 10:00
To: [EMAIL PROTECTED]
Subject: [REBOL] Re: tcp port open?
I know.... but I can't see that in Rebol.
I am thinking of adding 'persistent connections' to Rugby but I need to know
if the pipe is broken in order to do that.
--Maarten
On Tuesday 09 October 2001 10:53, you wrote:
> You should have receive a notification that the connection has dropped
> that's the nature of TCP!
>
>
> -----Original Message-----
> From: Petr Krenzelok [mailto:[EMAIL PROTECTED]]
> Sent: 09 October 2001 09:23
> To: [EMAIL PROTECTED]
> Subject: [REBOL] Re: tcp port open?
>
> Maarten Koopmans wrote:
> > Hi,
> >
> > Is there a way to now if a tcp port is open on both sides. So that a
>
> server
>
> > (or client) can see whether or not the other side of the pipe is still
>
> open?
>
> I am not sure. Designing our camera we looked at Ethereal
> (http://www.ethereal.org) packet monitor, and TCP communication is several
> stages process of various ACK, SYN, RST, PSH, FIN type packets. There is
no
> real
> "connection" on the network, just packets sent here and there. That is why
> someone can watch your packets (sniff) and see what you are sending, if
> connected to the same network. So, alive connection is just some state in
> your
> tcp stack on your side, irrelevant to other side of "connection". There is
> also
> known case of semi-connection - e.g. one side timeouts, and the other side
> is
> still able to send packets, which are really delivered, just not probably
> processed.
>
> So, theoretically, if opposite side sends you FIN or RST assigned packet,
> you
> should note it. This question is, however, for Holger. We have 'query
> function
> available, maybe Rebol somehow knows, if opposite side closed the
> connection?
>
> -pekr-
>
> > Thanks,
> >
> > Maarten
> > --
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> > subject, without the quotes.
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