whether there are any packets in the ip_queue

whether there are any packets in the ip_queue

[Jee J.Z.]

Hi all,

I am using libipq for userspace programming on netfilter. I am having
problems to determine whether there are any packets in the ip_queue before I
call the function ipq_read(). I just don't wish to call ipq_read() when
there is no packet in the ip_queue, because I need my program to do other
things rather than waiting for a packet arriving (after calling ipq_read(),
the program will stop and wait for some time or until a packet coming from
the kernel). Are there anybody on the list who has any idea about this?

BTW, may I ask whether this is the proper list to ask about netfilter/libipq
programming, since it seems few people on the list talking about this kind
of questions?

Re: whether there are any packets in the ip_queue

[Sven Schuster]

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On Tue, Apr 20, 2004 at 01:16:17AM +0100, Jee J.Z. told us:
> Hi all,
> 
> I am using libipq for userspace programming on netfilter. I am having
> problems to determine whether there are any packets in the ip_queue before I
> call the function ipq_read(). I just don't wish to call ipq_read() when
> there is no packet in the ip_queue, because I need my program to do other
> things rather than waiting for a packet arriving (after calling ipq_read(),
> the program will stop and wait for some time or until a packet coming from
> the kernel). Are there anybody on the list who has any idea about this?

Why don't you just call ipq_read with a negative timeout value?? When
there's no packet available it will return immediately with a return
code of 0. (see "man ipq_read")


HTH

Sven

> 
> BTW, may I ask whether this is the proper list to ask about netfilter/libipq
> programming, since it seems few people on the list talking about this kind
> of questions?
> 

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