Problem about kqueue.

[Neelkanth Natu]

--- Snofe Deng <dsnofe at hotmail.com> wrote:
> 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?

No. I don't think so. Looking at the code, it seems you should get
back an EINVAL. I don't have a machine handy to validate this though.

best
Neel

> 
> 
> 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>
> > >
> > >
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> >
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