Hi Nick, > I found that neither close() nor shutdown() on a RFCOMM socket that is > currently connecting will cause the kernel to send HCI Create > Connection Cancel Command. This seems like a problem, since this means > there is no way to cancel an outgoing connection - even in the single > threaded case. > > Ideally for our use case both shutdown() and close() would cause the > Create Connection Cancel command to be sent. > > It is easy to check this with a code snippet like: > > fd = _socket(PF_BLUETOOTH, SOCK_STREAM, BTPROTO_RFCOMM); > flags = fcntl(fd, F_GETFL); > fcntl(fd, F_SETFL, flags | O_NONBLOCK); > connect(fd, (struct sockaddr *) &addr, sizeof(struct sockaddr)); > > sleep(1); > shutdown(fd, SHUT_RDWR); > sleep(1); > close(fd); > > Following this with hcidump you can see the Create Connection command > sent, but it does not get canceled on close or shutdown. > > 2009-05-19 17:55:16.098103 < HCI Command: Create Connection > (0x01|0x0005) plen 13 > bdaddr 00:11:22:33:44:55 ptype 0xcc18 rswitch 0x01 clkoffset 0x0000 > Packet type: DM1 DM3 DM5 DH1 DH3 DH5 > 2009-05-19 17:55:16.118305 > HCI Event: Command Status (0x0f) plen 4 > Create Connection (0x01|0x0005) status 0x00 ncmd 1 > > <--- shutdown() > <--- close() > > 2009-05-19 17:55:26.361744 > HCI Event: Connect Complete (0x03) plen 11 > status 0x04 handle 1 bdaddr 00:11:22:33:44:55 type ACL encrypt 0x00 > Error: Page Timeout > 2009-05-19 17:55:33.119251 < HCI Command: Create Connection > (0x01|0x0005) plen 13 > bdaddr 00:11:22:33:44:55 ptype 0xcc18 rswitch 0x01 clkoffset 0x0000 > Packet type: DM1 DM3 DM5 DH1 DH3 DH5 > 2009-05-19 17:55:33.139240 > HCI Event: Command Status (0x0f) plen 4 > Create Connection (0x01|0x0005) status 0x00 ncmd 1 > > > Tested on 2.6.29. > > Is this behavior intentional or is this a bug? I know that I tested this massively with non-blocking sockets and there is works perfectly fine. No idea why shutdown() or close() is not catching this. Please check with 2.6.30-rc6 kernel since the Simple Pairing changes might have broken something here. Regards Marcel -- To unsubscribe from this list: send the line "unsubscribe linux-bluetooth" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
