Date: Tue, 21 Apr 2009 09:59:49 -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: <bb4a86c70904210959w6de5e808h9f85ee2bb1995dbf@mail.gmail.com> In-Reply-To: <1240311202.361300.1366.nullmailer@galant.ukfsn.org> References: <E1Lv5La-00058x-HH@smtpbarns01> <bb4a86c70904201053y1a04d76el336432d3e1a23576@mail.gmail.com> <1240311202.361300.1366.nullmailer@galant.ukfsn.org>
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--0016364ed650356495046813930a Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit On Tue, Apr 21, 2009 at 3:53 AM, Iain Hibbert <plunky@rya-online.net> wrote: > On Mon, 20 Apr 2009, Maksim Yevmenkin wrote: > >> >> 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 :) > > Ok also in bt_devrecv() > - return type should be ssize_t > - size cannot be < 0 (use "size == 0")? sure. i changed it. > and what of validation of received data here? It could be worth checking > that the buffer is not truncated so that the caller does not have to worry > about it, but that does require checking the packet type.. why not? :) i added it as well. >> > 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. > > Mm, its a good point - there are arguments either way (bloat vs guaranteed > success) but I think since the difference between devreq() and devrecv() > is that devreq() handles all the fiddly details for you, I think its worth > doing that aswell.. fine. it now sets and restores filter :) >> > 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. > > My thought was that some of the 'fields' do seem to cross over into > multiple bytes (eg the service class flags in the default format type) and > perhaps its easier to interpret as a single value where bits can be tested > in host order by such as (class & (1 << N))? I don't know how much that > helps but the assigned numbers document does seem to show it as a bit > array. (I'm not having a strong opinion either :) left it as 3 bytes array for now. >> > 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. > > No, I mean to specifically mention ".Xr free 3" as the method used to > dispose of the buffer. ah, i see. man page was updated. the revised diff is attached. please review. thanks, max --0016364ed650356495046813930a 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_ftsuch0v0 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