* Can one program see another's scan-results? @ 2012-07-10 19:02 Ben Greear 2012-07-10 19:08 ` Johannes Berg 0 siblings, 1 reply; 6+ messages in thread From: Ben Greear @ 2012-07-10 19:02 UTC (permalink / raw) To: linux-wireless Is there a way to open a netlink socket and have it receive all scan results (even those requested by other applications)? Thanks, Ben -- Ben Greear <greearb@candelatech.com> Candela Technologies Inc http://www.candelatech.com ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Can one program see another's scan-results? 2012-07-10 19:02 Can one program see another's scan-results? Ben Greear @ 2012-07-10 19:08 ` Johannes Berg 2012-07-10 19:19 ` Ben Greear 0 siblings, 1 reply; 6+ messages in thread From: Johannes Berg @ 2012-07-10 19:08 UTC (permalink / raw) To: Ben Greear; +Cc: linux-wireless On Tue, 2012-07-10 at 12:02 -0700, Ben Greear wrote: > Is there a way to open a netlink socket and have it receive > all scan results (even those requested by other applications)? What do you mean by scan results? The results themselves? No, they are a dump and unicast to one application. The fact that a scan finished? Yes, of course. johannes ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Can one program see another's scan-results? 2012-07-10 19:08 ` Johannes Berg @ 2012-07-10 19:19 ` Ben Greear 2012-07-10 19:22 ` Johannes Berg 0 siblings, 1 reply; 6+ messages in thread From: Ben Greear @ 2012-07-10 19:19 UTC (permalink / raw) To: Johannes Berg; +Cc: linux-wireless On 07/10/2012 12:08 PM, Johannes Berg wrote: > On Tue, 2012-07-10 at 12:02 -0700, Ben Greear wrote: >> Is there a way to open a netlink socket and have it receive >> all scan results (even those requested by other applications)? > > What do you mean by scan results? The results themselves? No, they are a > dump and unicast to one application. The fact that a scan finished? Yes, > of course. I'd like the results themselves..for instance, just piggyback on whatever supplicant is already doing to get periodic updates, and of course I'd end up requesting some scans myself from time to time if a user wanted an immediate update. I was hoping it could be something like just listening for network-device and route updates like netlink already supports. Since scanning is relatively slow and expensive, it seems like a good idea to allow re-using the results... Thanks, Ben -- Ben Greear <greearb@candelatech.com> Candela Technologies Inc http://www.candelatech.com ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Can one program see another's scan-results? 2012-07-10 19:19 ` Ben Greear @ 2012-07-10 19:22 ` Johannes Berg 2012-07-10 19:31 ` Ben Greear 0 siblings, 1 reply; 6+ messages in thread From: Johannes Berg @ 2012-07-10 19:22 UTC (permalink / raw) To: Ben Greear; +Cc: linux-wireless On Tue, 2012-07-10 at 12:19 -0700, Ben Greear wrote: > On 07/10/2012 12:08 PM, Johannes Berg wrote: > > On Tue, 2012-07-10 at 12:02 -0700, Ben Greear wrote: > >> Is there a way to open a netlink socket and have it receive > >> all scan results (even those requested by other applications)? > > > > What do you mean by scan results? The results themselves? No, they are a > > dump and unicast to one application. The fact that a scan finished? Yes, > > of course. > > I'd like the results themselves..for instance, just piggyback on whatever > supplicant is already doing to get periodic updates, and of course I'd > end up requesting some scans myself from time to time if a user wanted > an immediate update. > > I was hoping it could be something like just listening for network-device > and route updates like netlink already supports. > > Since scanning is relatively slow and expensive, it seems like a good > idea to allow re-using the results... Well, umm.. you can just request the results? A la "iw wlan0 scan dump"? johannes ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Can one program see another's scan-results? 2012-07-10 19:22 ` Johannes Berg @ 2012-07-10 19:31 ` Ben Greear 2012-07-10 19:39 ` Johannes Berg 0 siblings, 1 reply; 6+ messages in thread From: Ben Greear @ 2012-07-10 19:31 UTC (permalink / raw) To: Johannes Berg; +Cc: linux-wireless On 07/10/2012 12:22 PM, Johannes Berg wrote: > On Tue, 2012-07-10 at 12:19 -0700, Ben Greear wrote: >> On 07/10/2012 12:08 PM, Johannes Berg wrote: >>> On Tue, 2012-07-10 at 12:02 -0700, Ben Greear wrote: >>>> Is there a way to open a netlink socket and have it receive >>>> all scan results (even those requested by other applications)? >>> >>> What do you mean by scan results? The results themselves? No, they are a >>> dump and unicast to one application. The fact that a scan finished? Yes, >>> of course. >> >> I'd like the results themselves..for instance, just piggyback on whatever >> supplicant is already doing to get periodic updates, and of course I'd >> end up requesting some scans myself from time to time if a user wanted >> an immediate update. >> >> I was hoping it could be something like just listening for network-device >> and route updates like netlink already supports. >> >> Since scanning is relatively slow and expensive, it seems like a good >> idea to allow re-using the results... > > Well, umm.. you can just request the results? A la "iw wlan0 scan dump"? So, you could listen for the 'scan-complete' netlink message, and then when you receive it, immediately go ask for a 'scan dump' for that interface, and immediately get the last scan results? Aside from a small race (what if something else did something to invalidate those scan results), that sounds like it might be good enough to me. Thanks, Ben -- Ben Greear <greearb@candelatech.com> Candela Technologies Inc http://www.candelatech.com ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Can one program see another's scan-results? 2012-07-10 19:31 ` Ben Greear @ 2012-07-10 19:39 ` Johannes Berg 0 siblings, 0 replies; 6+ messages in thread From: Johannes Berg @ 2012-07-10 19:39 UTC (permalink / raw) To: Ben Greear; +Cc: linux-wireless On Tue, 2012-07-10 at 12:31 -0700, Ben Greear wrote: > On 07/10/2012 12:22 PM, Johannes Berg wrote: > > On Tue, 2012-07-10 at 12:19 -0700, Ben Greear wrote: > >> On 07/10/2012 12:08 PM, Johannes Berg wrote: > >>> On Tue, 2012-07-10 at 12:02 -0700, Ben Greear wrote: > >>>> Is there a way to open a netlink socket and have it receive > >>>> all scan results (even those requested by other applications)? > >>> > >>> What do you mean by scan results? The results themselves? No, they are a > >>> dump and unicast to one application. The fact that a scan finished? Yes, > >>> of course. > >> > >> I'd like the results themselves..for instance, just piggyback on whatever > >> supplicant is already doing to get periodic updates, and of course I'd > >> end up requesting some scans myself from time to time if a user wanted > >> an immediate update. > >> > >> I was hoping it could be something like just listening for network-device > >> and route updates like netlink already supports. > >> > >> Since scanning is relatively slow and expensive, it seems like a good > >> idea to allow re-using the results... > > > > Well, umm.. you can just request the results? A la "iw wlan0 scan dump"? > > So, you could listen for the 'scan-complete' netlink message, and then > when you receive it, immediately go ask for a 'scan dump' for that interface, > and immediately get the last scan results? Yes. > Aside from a small race (what if something else did something to invalidate > those scan results), that sounds like it might be good enough to me. There's not much that anything could do to do that. johannes ^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2012-07-10 19:39 UTC | newest] Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2012-07-10 19:02 Can one program see another's scan-results? Ben Greear 2012-07-10 19:08 ` Johannes Berg 2012-07-10 19:19 ` Ben Greear 2012-07-10 19:22 ` Johannes Berg 2012-07-10 19:31 ` Ben Greear 2012-07-10 19:39 ` Johannes Berg
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