Date: Mon, 20 Apr 2009 10:53:26 -0700 From: Maksim Yevmenkin <maksim.yevmenkin@gmail.com> To: Iain Hibbert <plunky@rya-online.net> Cc: freebsd-bluetooth@freebsd.org Subject: Re: libhci update Message-ID: <bb4a86c70904201053y1a04d76el336432d3e1a23576@mail.gmail.com> In-Reply-To: <E1Lv5La-00058x-HH@smtpbarns01> References: <E1Lv5La-00058x-HH@smtpbarns01>
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--0016361e891e0cf2e0046800354d Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit >> thanks for the feedback. i'm attaching revisited patch. please take a >> look and let me know if this is something you happy with. > > (pls ignore typos & bad formatting, am on mobile device :) > > Bt_devrecv() should probably take void * for buffer? Also manpage suggests it > will only receive hci events. Do you think its worth doing some validation of received > data? (eg return EIO for truncated reads?) i will change uint8_t * to void *, no problem. i also updated man page and removed 'event' word :) > Bt_devinquiry() should probably restore the filter after use? Also needs to ensure hci > event packets are enabled? its an implementation detail :) bt_devinqury() opens completely new socket. in freebsd, filter is attached to the socket and is already set to "sensible" defaults. so, all we need to do is to enable events that we care about, i.e. inquiry result and inquiry complete. also since bt_devinqury() is closing the socket after its done, there is no need to restore original filter. > Bt_devreq() needs to set/restore a filter too well, maybe. bt_devreq() operates on already opened socket. the assumption i'm making here is that application will set appropriate filter before calling bt_devreq(). otherwise, application would have to always set 'event' field to acceptable value (or zero). i could go either way here. just need to document implemented behavior better. > In bt_devreq structure event should be uint8_t? Also clen and rlen should be size_t ok :) i was trying to get rid of hole with uint16_t event, but it does not matter. also clen/rlen are size_t in bluetooth.h, its just i did not update man page :) > Do you think its worth to cook dev_class into a normalised host numeric value rather than 3 bytes ? right, hmm, i guess we could turn dev_class into uint32_t in le16 byte order (since everything else in bluetooth hci is in le16 order), but maybe its too much? spec breaks out dev_class as 3 bytes array and talks about bytes and bits within each byte. i'm kinda leaning towards leaving it as is, because otherwise application would have to translate byte/bit into uint32_t mask. it could be somewhat convenient, i guess. again, no strong feeling about it. could go either way. > Probably need to specifically mention that the inquiry response to be released using free() in manpage? it says so, i.e. The .Fa ii parameter specifies where to place inquiry results. On success, the function will return total number of inquiry results, will allocate buffer to store all the inquiry results and will return pointer to the allocated buffer in the .Fa ii parameter. It is up to the caller of the function to dispose of the buffer. > Something i thought about on the train yesterday but can't visualise on the small > screen. For device inquiry did you consider using a callback method (as per devenum) > in stead of returning the structure array? At least i recall my nokia would show the > list building (but perhaps that was when it got the names) and this windows mobile > device does show the raw list in progress (though stupidly just displays a list of > 'unknown device' until it gets the names :) yes, i thought about it. the only difference is that it would be not so close to linux/bluez api. i guess, we could provide another function? i'm attaching revised diff for your review. thanks, max --0016361e891e0cf2e0046800354d Content-Type: text/plain; charset=US-ASCII; name="bluetooth.hci.diff.txt" Content-Disposition: attachment; filename="bluetooth.hci.diff.txt" Content-Transfer-Encoding: base64 X-Attachment-Id: f_ftrgtjgb0 SW5kZXg6IGhjaS5jCj09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT0KLS0tIGhjaS5jCShyZXZpc2lvbiAxOTEzMjgpCisrKyBo Y2kuYwkod29ya2luZyBjb3B5KQpAQCAtMzAsMTUgKzMwLDQ0NSBAQAogICogJEZyZWVCU0QkCiAg Ki8KIAorI2luY2x1ZGUgPGFzc2VydC5oPgogI2luY2x1ZGUgPGJsdWV0b290aC5oPgogI2luY2x1 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