Date: Wed, 7 May 2003 22:21:02 -0700 (PDT) From: Neelkanth Natu <neelnatu@yahoo.com> To: Snofe Deng <dsnofe@hotmail.com>, freebsd-net@freebsd.org Subject: Re: Problem about kqueue. Message-ID: <20030508052102.14548.qmail@web14204.mail.yahoo.com> In-Reply-To: <20030506200419.D011.DSNOFE@hotmail.com>
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--- Snofe Deng <dsnofe@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@hotmail.com>
>
>
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