[Bluez-devel] [PATCH]Re: multithreaded name resolution

[Andreas Gaufer <Andreas.Gaufer@bluecellnetworks.com>]

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On Fri, 24 Aug 2007 14:14:53 +0200 (CEST)
Peter Wippich <pewi@gw-instruments.de> wrote:

> 
> Hi Matthias,
> 
> On Fri, 24 Aug 2007, Matthias Becker wrote:
> 
> > Hi,
> > 
> > I tried to read the name of different devices parallel using multi
> > threading, but without success. If there is one bluetooth device I works
> > (as there is no real multi threading). If there are who devices, the
> > same name is reported for both devices. In another test with 6 devices
> > hci_read_remote_name returned something <0 so I did not get any name at
> > all.
> 
> this won't work. Asking for the name of a device is some sort of 
> connection setup, and most (all ?) Bt chips do not allow / can not handle 
> parallel connection setups (even though parallel connections are 
> possible). 
> 
> So don't try further, the problem is outside your code (and even BlueZ). 
> 

That's not true, the reported behavior is produced by bluez-libs. I already
sent a patch to fix it and will attach that patch again to this mail.

Please let me know if that Patch fixes your problem Matthias.

Greetings

Andy

See also:
http://thread.gmane.org/gmane.linux.bluez.devel/12491

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diff -ur bluez-libs-3.19-ORG/src/hci.c bluez-libs-3.19/src/hci.c
--- bluez-libs-3.19-ORG/src/hci.c	2007-10-01 11:06:18.013479576 +0200
+++ bluez-libs-3.19/src/hci.c	2007-10-01 15:19:36.301988528 +0200
@@ -1010,6 +1010,8 @@
 	while (try--) {
 		evt_cmd_complete *cc;
 		evt_cmd_status   *cs;
+		evt_remote_name_req_complete *rn;
+		remote_name_req_cp *cp;
 
 		if (to) {
 			struct pollfd p;
@@ -1074,6 +1076,21 @@
 			memcpy(r->rparam, ptr, r->rlen);
 			goto done;
 
+		case EVT_REMOTE_NAME_REQ_COMPLETE:
+
+			if (hdr->evt != r->event)
+				break;
+
+			r->rlen = MIN(len, r->rlen);
+			memcpy(r->rparam, ptr, r->rlen);
+
+			rn = r->rparam;
+			cp = r->cparam;
+
+			if (bacmp(&rn->bdaddr,&cp->bdaddr) == 0)
+				goto done;
+			continue;
+
 		default:
 			if (hdr->evt != r->event)
 				break;

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