Problem about kqueue.

[Snofe Deng]

thanks. and another problem is that:
if i register:
{ident, EVFILT_READ}
{ident, EVFILT_WRITE}
{ident, EVFILT_TIMER}
to kq;

than I register:
{newident, EV_DELETE} , I do not set the filter's value, just set the 
flags.
does this action will remove all pairs which ident equal the newident?


thanks!







>From: Neelkanth Natu <neelnatu at yahoo.com>
>To: Snofe Deng <dsnofe at hotmail.com>, freebsd-net at freebsd.org
>Subject: Re: Problem about kqueue.
>Date: Wed, 7 May 2003 22:21:02 -0700 (PDT)
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>--- Snofe Deng <dsnofe at hotmail.com> wrote:
> > If I register:
> > {ident, EVFILT_READ}
> > {ident, EVFILT_WRITE}
> > {ident, EVFILT_TIMER}
> > pairs to kq;and all the piar with same ident which is a socket 
descriptor.
> > then I close(2) ident. Does this mean that all these three
> > {ident, filter} pairs will be removed just after the descriptor 
isclosed?
>
>No. The EVFILT_TIMER ident has a different namespace than the
>file descriptor namespace. The fact that the ident value for TIMER
>is the same as the socket fd is of no significance.
>
> > or should I use:
> > EV_SET(&evs, ident, EVFILT_READ, EV_DELETE, 0, 0, NULL)
> > EV_SET(&evs, ident, EVFILT_WRITE, EV_DELETE, 0, 0, NULL)
> > EV_SET(&evs, ident, EVFILT_TIMER, EV_DELETE, 0, 0, NULL)
> > to delete these three pairs?
> >
> > when I just closed the socket descriptor, the {ident,
> > EVFILT_READ/EVFILT_WRITE} are removed. but {ident, EVFILT_TIMER}
> > is still returned at next kevent(2) loop. Is it a bug? or why should
> > this happend?
>
>It is not a bug. Calling a close on a file descriptor will remove
>all kevents associated with that fd. So you don't have to explicitly
>delete them.
>
>However if you want to remove the EVFILT_TIMER event too, you have
>two choices:
>- Use EV_ONESHOT to automatically delete the kevent once it is
>   delivered.
>- Explicitly delete it as you are doing above.
>
>best
>Neel
>
> >
> > when I use the second way, things worked ok.
> > Any one can help me?
> > thanks a lot!
> >
> > --
> > Snofe Deng <dsnofe at hotmail.com>
> >
> >
> > _______________________________________________
> > freebsd-net at freebsd.org mailing list
> > http://lists.freebsd.org/mailman/listinfo/freebsd-net
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>
>
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