April 2005 - Darwin-kernel - lists.apple.com

RE: Writing to file from Kernel Extension
by Carl Smith 06 Apr '05

06 Apr '05

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Thread-index: AcU7COH97AnRYiM8QWOzajN9nf6UwgAABhuQ Thread-topic: Writing to file from Kernel Extension That was what I was afraid of but I did see some stuff in sys/file.h, like fo_write, fo_close and so on, but could not find it used any where as an example. Are these not the functions I think they are? Thanks Carl -----Original Message----- From: darwin-kernel-bounces+csmith=fortresstech.com(a)lists.apple.com [mailto:darwin-kernel-bounces+csmith=fortresstech.com@lists.apple.com] On Behalf Of Justin Walker Sent: Wednesday, April 06, 2005 8:30 PM To: darwin-kernel Dev Subject: Re: Writing to file from Kernel Extension On Apr 6, 2005, at 17:21, Carl Smith wrote: > > > Is there some sample code or special calls to be able to write from a > kernel extension to a file, like with 'fopen', 'fprintf' and so on? No there is not. The answer here is the same as that to your last thread regarding the use of <stdlib.h> and getifaddrs() in kernel code: you can't do it. Regards, Justin -- Justin C. Walker, Curmudgeon-At-Large Institute for General Semantics -------- When LuteFisk is outlawed, Only outlaws will have LuteFisk -------- _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/csmith%40fortresstech.… This email sent to csmith(a)fortresstech.com _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… This email sent to site_archiver(a)lists.apple.com

1 0

Re: Writing to file from Kernel Extension
by Justin Walker 06 Apr '05

06 Apr '05

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com On Apr 6, 2005, at 17:21, Carl Smith wrote: Regards, Justin -- Justin C. Walker, Curmudgeon-At-Large Institute for General Semantics -------- When LuteFisk is outlawed, Only outlaws will have LuteFisk -------- _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… Is there some sample code or special calls to be able to write from a kernel extension to a file, like with ‘fopen’, ‘fprintf’ and so on? No there is not. The answer here is the same as that to your last thread regarding the use of <stdlib.h> and getifaddrs() in kernel code: you can't do it. This email sent to site_archiver(a)lists.apple.com

1 0

Re: Writing to file from Kernel Extension
by Dean Reece 06 Apr '05

06 Apr '05

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… This email sent to site_archiver(a)lists.apple.com

1 0

Writing to file from Kernel Extension
by Carl Smith 06 Apr '05

06 Apr '05

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Thread-index: AcU7B62zrb0PnwmWQDydlX2h2hObvw== Thread-topic: Writing to file from Kernel Extension _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… This email sent to site_archiver(a)lists.apple.com

1 0

FW: dlil_attah_interface_filter
by Carl Smith 06 Apr '05

06 Apr '05

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Thread-index: AcU6wWDsW6llAhYSTL6owBOmKVPVJwAJYTUA Thread-topic: dlil_attah_interface_filter > In my NKE I have attached some filtering using > 'dlil_attach_interface_filter' and pointed my call back functions via > this call. > > The filtering works find and in my call back function, > My_if_input(caddr_t cookie, struct ifnet **ifnet_ptr, struct mbuf > **mbuf_ptr), I want to get/look at the filter ID of the calling filter. > This is the value that was obtained in the previous calling to > 'dlil_attach_interface_filter'. > Another question I have relating to the above statement, is that in My_if_input I am trapping the mbuf, Ethernet frame, as it is coming in. That is from the outside world into the stack/machine. Now if I want to change this packet and send it along it's way and I want to use the functions dlil_inject_if_input, dlil_inject_if_output, am I correct in assuming that in my filtering function My_if_input, I would use dlil_inject_if_input and in My_if_output filter function I would use dlili_inject_if_output to send these 'altered' packets on there way? The only reason I am asking that as I was looking at the sample SharedIP I see that in the 'send' calls, i.e. si_send_eth_ipv4 the code is calling dlil_inject_pr_input. I thought a send was a call to the outside world so I would have thought the proper dlil call would have been dlil_inject_pr_output. This last statement along with the fact that every time I use dlil_inject_if_input in my My_if_input function I am getting a kernel panic, I am wondering if my logic or thinking is wrong. I would appreciate any feedback Carl _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… This email sent to site_archiver(a)lists.apple.com

1 0

Re: dlil_attah_interface_filter
by Stephane Sudre 06 Apr '05

06 Apr '05

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com On 2 avr. 05, at 23:45, Carl Smith wrote: In my NKE I have attached some filtering using 'dlil_attach_interface_filter' and pointed my call back functions via this call. The filtering works find and in my call back function, My_if_input(caddr_t cookie, struct ifnet **ifnet_ptr, struct mbuf **mbuf_ptr), I want to get/look at the filter ID of the calling filter. This is the value that was obtained in the previous calling to 'dlil_attach_interface_filter'. Is there some way to obtain this 'filter ID' from within the callback function My_if_input? I was thinking that the information might be contained in the 'cookie' parameter. I need this 'filter ID' to use in my call to dlil_inject_if_input. _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… If you did not set any cookie when you attached the filter, then the cookie filter won't contain any piece of information AFAIK. This email sent to site_archiver(a)lists.apple.com

1 0

Re: Writing to disk using filter scheme driver
by Yogesh P 06 Apr '05

06 Apr '05

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Hi Parav, I get the error at compile time itself. But there is declaration and definition of the function in my driver class as follows: MyDriver.h includes- class com_MySoftwareCompany_driver_MyFilterScheme : public IOStorage { OSDeclareDefaultStructors(com_MySoftwareCompany_driver_MyFilterScheme) virtual void DoDriverWrite(IOMemoryDescriptor *inBuffer); }; MyDriver.cpp includes - // kMyScalarIStructImethod void com_MySoftwareCompany_driver_MyFilterScheme::DoDriverWrite(IOMemoryDescriptor * inBuffer) { IOStorageCompletion completion; // If the user client's 'open' method was never called, return kIOReturnNotOpen. if (!isOpen()) { return kIOReturnNotOpen; } IOByteCount readBytes; UInt64 byteStart = 512; IOByteCount bufLength = inBuffer->getLength(); char *myBuff = new char[bufLength]; readBytes = inBuffer->readBytes(0, myBuff, bufLength); IOLog("MyFilterScheme::read BEFORE **** readBytes = %lu byteStart = %lu \ bufLength = %lu buffer = %s \n", (long)readBytes, (long)byteStart, (long)bufLength, myBuff); getProvider()->write(this, byteStart, inBuffer, completion); IOLog("MyFilterScheme::read AFTER **** readBytes = %lu byteStart = %lu \ bufLength = %lu buffer = %s \n", (long)readBytes, (long)byteStart, (long)bufLength, myBuff); delete[] myBuff; } Its a strange thing that even when the function is declared and define in my driver class compiler gives me the compile time error that there is no matching function IOSerive::DoDriverWrite(). Is there that i am mistaking in mapping of calls from userclient to driver??? Thanks, Yogesh Pahilwan On Tue, 2005-04-05 at 02:06, Parav Pandit wrote: > Hi Yogesh, > > ffProvider = > OSDynamicCast(com_MySoftwareCompany_driver_MyFilterScheme, > fProvider); > // is this a correct way of casting??? > > Yes, but you don't need to type cast because fPRovider > is already of type > > com_MySoftwareCompany_driver_MyFilterScheme. > > > But i am still facing the same problem that "no > matching function > > IOService::DoDriverWrite()" > > //com_MySoftwareCompany_driver_MyFilterScheme* > fProvider; > > If this is compilation error, it looks to me that your > driver class > > com_MySoftwareCompany_driver_MyFilterScheme ( NOT > com_MySoftwareCompany_MyUserClient) doesn't have > declaration and definition of DoDriverWrite() > function. > > and the compiler asking to it's top base class > IOServive whether it has the function or not. > > Regards, > Parav Pandit > > ________________________________________________________________________ > Yahoo! India Matrimony: Find your life partner online > Go to: http://yahoo.shaadi.com/india-matrimony > _______________________________________________ > Do not post admin requests to the list. They will be ignored. > Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) > Help/Unsubscribe/Update your Subscription: > http://lists.apple.com/mailman/options/darwin-kernel/shirke.mekhala%40spsof… > > This email sent to shirke.mekhala(a)spsoftindia.com _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… This email sent to site_archiver(a)lists.apple.com

1 0

Request: Info for filtering keystrokes?
by Jason von Nieda 04 Apr '05

04 Apr '05

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com User-agent: Mozilla Thunderbird 1.0 (Macintosh/20041206) Thanks, Jason von Nieda _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… Hi all. I am interested in writing software for OS X that will filter/translate certain keystroke combinations. This is to support a keyboard wedge barcode scanner (the old CueCat, if anyone remembers it). This device sends "encrypted" barcode information which I would like to capture, translate and insert back into the keyboard buffer properly formatted. I'd like for this code to be as high level as possible, but all indications I have seen so far make me think I'm going to need to write a kext. So, could anyone give me some pointers as to where to start with this? I'm just looking for the name of the right API, or the layer of the OS I should be looking at but I'd appreciate any information anyone can provide. This email sent to site_archiver(a)lists.apple.com

1 0

Re: m_devget
by Justin Walker 04 Apr '05

04 Apr '05

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Carl, On Apr 4, 2005, at 13:08, Carl Smith wrote: To get you started, m_devget() is in xnu/bsd/kern. This is the right forum. Regards, Justin -- Justin C. Walker, Curmudgeon-At-Large * Institute for General Semantics | Some people have a mental | horizon of radius zero, and | call it their point of view. | -- David Hilbert *--------------------------------------*-------------------------------* _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… I want to create a new chain of mbufs, I am using the function m_devget, my question is, what if I have data larger than 1500 bytes, say 3000 bytes, can I pass the buffer into m_devget and m_devget will chain, link out the data correctly or do I have to break up the large data myself, into 1500 bytes chunks and call m_devget twice? This is the kind of question you should be able to answer for yourself, with a quick look at the kernel code. A handy tool for this purpose is 'cscope', and there is a "makefile" hook to make the cscope database ("make cscope"). If this is not the proper forum for asking this question I would appreciate some feedback on where I should be asking these questions. This email sent to site_archiver(a)lists.apple.com

1 0

Re: m_devget
by Peter Lovell 04 Apr '05

04 Apr '05

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com On Apr 4, 2005, at 4:08 PM, Carl Smith wrote: Hi Carl, regards.....Peter _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… I want to create a new chain of mbufs, I am using the function m_devget, my question is, what if I have data larger than 1500 bytes, say 3000 bytes, can I pass the buffer into m_devget and m_devget will chain, link out the data correctly or do I have to break up the large data myself, into 1500 bytes chunks and call m_devget twice? I hope this is relatively simple question so I can get some response back from this forum. If this is not the proper forum for asking this question I would appreciate some feedback on where I should be asking these questions. Looking at xnu/bsd/kern/uipc.mbuf.c (hint hint) it would appear that it will break it up for you. Note that it doesn't wait, and can therefore fail and return zero (NULL). In case you don't know, you can also post such questions here (with probably a better hit rate) ... List-Subscribe: <http://lists.apple.com/mailman/listinfo/macnetworkprog>, <mailto:macnetworkprog-request@lists.apple.com?subject=subscribe> This email sent to site_archiver(a)lists.apple.com

1 0