Jaco Kroon wrote: > Eric Leblond wrote: > >> I've just wrote a brief nlif documentation on the following page: >> http://software.inl.fr/trac/trac.cgi/wiki/articles/using_nlif >> >> > This explains things quite a bit. Very nicely done. > > I'm actually using libnetfilter_queue, and am not doing anything > multi-threaded, would it be sufficient just to call nlif_catch() every > time I run into an interface for which there is no name and to then > retry the call? Alternatively, you mention select(), I'm guessing the > poll() system call will achieve the same thing? My reasoning here is > that everytime just before calling nlif_index2name() to first call > poll() with a timeout of zero in order to check whether there are > updates and to then call nlif_catch if there are updates, however, is > this the most efficient way, since poll() and nlif_catch() both probably > results in a system call, wouldn't it simply be more efficient to just > call nlif_catch every time just before calling nlif_index2name? > > Also, in the case of poll(), I guess I need to poll for POLLIN? > Ok, so after testing it turns out poll(2) does work quite nicely, however, I need to call nlif_catch quite a few times to get things to work nicely, so now I've basically got this piece of code just before nlif_index2name(): while (poll(&nlif_poll, 1, 0) > 0) { log (LOG_INFO, "Calling nlif_catch due to device changes."); nlif_catch(nlif); } And it turns out that simply restarting ppp0 causes quite a few events: [INFO]: Calling nlif_catch due to device changes. [INFO]: Calling nlif_catch due to device changes. [INFO]: Calling nlif_catch due to device changes. [INFO]: Calling nlif_catch due to device changes. [INFO]: Calling nlif_catch due to device changes. [INFO]: Calling nlif_catch due to device changes. [INFO]: Calling nlif_catch due to device changes. [INFO]: Calling nlif_catch due to device changes. [INFO]: Calling nlif_catch due to device changes. [INFO]: Calling nlif_catch due to device changes. [INFO]: Calling nlif_catch due to device changes. [INFO]: Calling nlif_catch due to device changes. [INFO]: Calling nlif_catch due to device changes. [INFO]: Calling nlif_catch due to device changes. [INFO]: Setting device ppp0(9) to cap 2. Not sure what's causing all those events but it works correctly now, thanks. Jaco - To unsubscribe from this list: send the line "unsubscribe netfilter" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
