May 2006 - Darwin-kernel - lists.apple.com

Re: loading kext from a daemon program
by Jim Thompson 04 May '06

04 May '06

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com On May 4, 2006, at 1:04 PM, Matt Ginzton wrote: ala (written from scratch, not even thrown to gcc for syntax checking) #include <stdio.h> #include <sys/types.h> pid_t pid; int status; /* if we got here, we're the parent, wait for kextload to finish */ if ((pid = waitpid(pid, &status, 0)) < 0) { perror("wait error"); } /* status will tell us if kextload finish with a non-zero exit code */ _______________________________________________ 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.… int result = execlp("kextload", "kextload", "<path to my kext>" (char *)0); this does load the kext but exists my daemon program, I am guessing because of what the documentation says that it replaces the current process image with the new process image. The normal Unix way of doing this is a combination of fork, exec, and wait. Fork creates a separate process, in which you can exec kextload, and then the parent process waits for the child to exit. if (( pid = fork()) < 0) { /* fork failed, not much we can do */ perror("fork error"); } else if (pid == 0) { /* child, execute kextload */ if (execlp("kextload", "kextload", "<path to module>", (char *)0) { perror("execlp error"); /* child doesn't get here on success of execlp */ exit(1); } } This email sent to site_archiver(a)lists.apple.com

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Re: loading kext from a daemon program
by Justin C. Walker 04 May '06

04 May '06

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com On May 4, 2006, at 12:46 , Rob Crawford wrote: I exe call that I made was: Yup; that is exactly what happens. Regards, Justin -- Justin C. Walker, Curmudgeon at Large Institute for the Absorption of Federal Funds ----------- I'm beginning to like the cut of his jibberish. ----------- _______________________________________________ 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.… int result = execlp("kextload", "kextload", "<path to my kext>" (char *)0); this does load the kext but exists my daemon program, I am guessing because of what the documentation says that it replaces the current process image with the new process image. What I need to do is: 1. is the kext loaded? 2. if it's not loaded load the kext and then wait for the result of the load then continue running the daemon. I assume you can handle (1); the trick for (2) is that you need to 'fork()' before calling 'exec()'. This will give you a parent and a child, and depending on exactly what your goals are, either can do the exec (and, as you noticed, exit when done). It may make sense to have the parent call exec(), and have the child continue to execute as the daemon. That way, your child will become a "background" task. As I said, it does depend on your current code and what your goals are. In addition, I will take a leap to the conclusion that programming of this sort is new to you. If so, you might find the book "Advanced Programming in the Unix Environment". by W. Richard Stevens, to be a good investment. It is a bit dated, but it does give you a very good reference for how to do things when programming for a Unix system. There are other books describing the higher-level frameworks and styles for Mac OS X, but if your interest is in the lower layers, Stevens wrote a number of very good books on the subject. This email sent to site_archiver(a)lists.apple.com

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Re: loading kext from a daemon program
by Matt Ginzton 04 May '06

04 May '06

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com User-agent: Thunderbird 1.5.0.2 (Windows/20060308) int result = execlp("kextload", "kextload", "<path to my kext>" (char *)0); Matt _______________________________________________ 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 does load the kext but exists my daemon program, I am guessing because of what the documentation says that it replaces the current process image with the new process image. The normal Unix way of doing this is a combination of fork, exec, and wait. Fork creates a separate process, in which you can exec kextload, and then the parent process waits for the child to exit. This email sent to site_archiver(a)lists.apple.com

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Re: loading kext from a daemon program
by Rob Crawford 04 May '06

04 May '06

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com I exe call that I made was: thanks, Rob On May 4, 2006, at 3:27 PM, Justin C. Walker wrote: On May 4, 2006, at 12:19 , Rob Crawford wrote: Any idea why your app terminates? Regards, Justin -- Justin C. Walker, Curmudgeon-At-Large Institute for the Absorption of Federal Funds -------- Men are from Earth. Women are from Earth. Deal with it. -------- _______________________________________________ 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/robc%40mac.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.… int result = execlp("kextload", "kextload", "<path to my kext>" (char *)0); this does load the kext but exists my daemon program, I am guessing because of what the documentation says that it replaces the current process image with the new process image. What I need to do is: 1. is the kext loaded? 2. if it's not loaded load the kext and then wait for the result of the load then continue running the daemon. I have tried a few ways of loading it all end with the termination of the daemon. First way I tried was a exe call to kextload, this causes my app to terminate and but the kext does load. The other way was using NSTask launchedTaskWithLaunchPath, with the same result. To answer your question is the I don't know how or what path to start looking in for for a solution. I know squat about NS* stuff. When you say "exe call", what does that mean? FWIW, folks on this list try to help, so that those with questions can get answers, learn, and perhaps contribute. One of the important things to consider when asking for help is what might be needed to provide that help. Imprecise or vague information just wastes our time and yours. Code snippets can sometimes help (which isn't a request to post your whole app); specific error messages, or error codes returned from the kernel, are generally useful. This email sent to robc(a)mac.com This email sent to site_archiver(a)lists.apple.com

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Re: loading kext from a daemon program
by Justin C. Walker 04 May '06

04 May '06

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com On May 4, 2006, at 12:19 , Rob Crawford wrote: Any idea why your app terminates? Regards, Justin -- Justin C. Walker, Curmudgeon-At-Large Institute for the Absorption of Federal Funds -------- Men are from Earth. Women are from Earth. Deal with it. -------- _______________________________________________ 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 have tried a few ways of loading it all end with the termination of the daemon. First way I tried was a exe call to kextload, this causes my app to terminate and but the kext does load. The other way was using NSTask launchedTaskWithLaunchPath, with the same result. To answer your question is the I don't know how or what path to start looking in for for a solution. I know squat about NS* stuff. When you say "exe call", what does that mean? FWIW, folks on this list try to help, so that those with questions can get answers, learn, and perhaps contribute. One of the important things to consider when asking for help is what might be needed to provide that help. Imprecise or vague information just wastes our time and yours. Code snippets can sometimes help (which isn't a request to post your whole app); specific error messages, or error codes returned from the kernel, are generally useful. This email sent to site_archiver(a)lists.apple.com

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Re: loading kext from a daemon program
by Rob Crawford 04 May '06

04 May '06

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com thanks, Rob On May 4, 2006, at 3:01 PM, Justin C. Walker wrote: On May 4, 2006, at 11:48 , Rob Crawford wrote: So, when you say "can't", you mean you don't know how? This is an appropriate list. Regards, Justin -- Justin C. Walker, Curmudgeon-At-Large Institute for the Absorption of Federal Funds -------- Men are from Earth. Women are from Earth. Deal with it. -------- _______________________________________________ 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/robc%40mac.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.… I have tried a few ways of loading it all end with the termination of the daemon. First way I tried was a exe call to kextload, this causes my app to terminate and but the kext does load. The other way was using NSTask launchedTaskWithLaunchPath, with the same result. To answer your question is the I don't know how or what path to start looking in for for a solution. I have a kernel extension and a daemon program that communicate with one another, when the daemon process starts up it needs to load the kernel extension and then connect with it, this is all done at the root user level. This may be the wrong list to post this to, not sure, if it the wrong list please advise as to what list would be appropriate. This email sent to robc(a)mac.com This email sent to site_archiver(a)lists.apple.com

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Re: loading kext from a daemon program
by Justin C. Walker 04 May '06

04 May '06

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com On May 4, 2006, at 11:48 , Rob Crawford wrote: So, when you say "can't", you mean you don't know how? This is an appropriate list. Regards, Justin -- Justin C. Walker, Curmudgeon-At-Large Institute for the Absorption of Federal Funds -------- Men are from Earth. Women are from Earth. Deal with it. -------- _______________________________________________ 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 have a kernel extension and a daemon program that communicate with one another, when the daemon process starts up it needs to load the kernel extension and then connect with it, this is all done at the root user level. This may be the wrong list to post this to, not sure, if it the wrong list please advise as to what list would be appropriate. This email sent to site_archiver(a)lists.apple.com

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Re: loading kext from a daemon program
by Rob Crawford 04 May '06

04 May '06

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Sorry about that. thanks, Rob On May 4, 2006, at 2:43 PM, Justin C. Walker wrote: On May 4, 2006, at 11:26 , Rob Crawford wrote: Regards, Justin -- Justin C. Walker, Curmudgeon-At-Large, Director Institute for the Enhancement of the Director's Income -------- The path of least resistance: it's not just for electricity any more. -------- _______________________________________________ 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/robc%40mac.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.… I have a kernel extension and a daemon program that communicate with one another, when the daemon process starts up it needs to load the kernel extension and then connect with it, this is all done at the root user level. This may be the wrong list to post this to, not sure, if it the wrong list please advise as to what list would be appropriate. I have kext that needs to be loaded from a daemon process, then proceed to connect using the kernel control mechanism. When I load the kext with kextload and then run the daemon everything works just fine, but I can't get the daemon to load the kext then continue to connect with it, any suggestions? It would help to know what "I can't get the daemon to load the kext" means. This email sent to robc(a)mac.com This email sent to site_archiver(a)lists.apple.com

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Re: Kext loading daemon
by Justin C. Walker 04 May '06

04 May '06

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com On May 4, 2006, at 11:26 , Rob Crawford wrote: Regards, Justin -- Justin C. Walker, Curmudgeon-At-Large, Director Institute for the Enhancement of the Director's Income -------- The path of least resistance: it's not just for electricity any more. -------- _______________________________________________ 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 have kext that needs to be loaded from a daemon process, then proceed to connect using the kernel control mechanism. When I load the kext with kextload and then run the daemon everything works just fine, but I can't get the daemon to load the kext then continue to connect with it, any suggestions? It would help to know what "I can't get the daemon to load the kext" means. This email sent to site_archiver(a)lists.apple.com

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Kext loading daemon
by Rob Crawford 04 May '06

04 May '06

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com thanks rob _______________________________________________ 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 have kext that needs to be loaded from a daemon process, then proceed to connect using the kernel control mechanism. When I load the kext with kextload and then run the daemon everything works just fine, but I can't get the daemon to load the kext then continue to connect with it, any suggestions? This email sent to site_archiver(a)lists.apple.com

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