Re: How to know a brower closed

[Nadkarni, Chinmay (Chinmay)** CTR **]

Pankaj,

Java does not have any implementation of RAW/ICMP sockets. The only types of
sockets available are TCP and UDP. If you want to implement a ping (like)
utility, you can do it in TCP or UDP, but you will also have to implement a
server for it.

Or, you might want to take a look at the echo server that runs on port 7 and
is UDP based.

 - Chinmay

> ----------
> From:         Pankaj[SMTP:[EMAIL PROTECTED]]
> Reply To:     A mailing list for discussion about Sun Microsystem's Java
> Servlet API Technology.
> Sent:         Thursday, November 18, 1999 12:03 PM
> To:   [EMAIL PROTECTED]
> Subject:      Re: How to know a brower closed
>
> Hello,
>
> I know this is way off topic, but i found this in the Java Documentation
> (socketOpt.html) that i downloaded. Takea look and correct me if i am
> wrong.
> ------------------------------------------------------------------------
> Fell by the wayside...
>
> Some possible BSD options that are not supported in java:
>
> SO_KEEPALIVE:
>      With this option, the OS repeatedly pings the connection's peer to
> make
> sure it's still there. The conventional wisdom on
>      this is that this functionality is best handled at the application
> level.
> The Host Requirements RFC specifies a ping interval
>      of 2 hours, which is not practically useful.
>
> MSG_OOB:
>      This is really an option one passes to a read() or recv() on a socket
> to
> read data marked out-of-band or "urgent" if it
>      present, before in-band data. If we include this we should also
> include
> an option SO_OOBINLINE (below), but this
>      doesn't seem to be needed. The real complication against this is that
> we'd also have to provide a symmetrical way to
>      write OOB data, and again this hasn't been requested.
>
> SO_OOBINLINE:
>      This option will inline OOB data, making it appear inline like
> "normal"
> data. It would work in conjunction with
>      MSG_OOB.
>
> RAW/ICMP SOCKETS:
>      The main argument in favor of this one seemed to be so people could
> write
> "ping" in java. Security nightmare. Must be
>      root on UNIX machines.
> ------------------------------------------------------------------------
>
> Now, Does this mean i cannot write a pinging utility in Pure Java..? What
> do
> they mean by "Security Nightmare. Must be root
> on UNIX machines." Does it have to do anything with "Ping of death."
> problem?
> Please clarify anybody..!
>
> Thanx,
> Pankaj
>
>
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