April 2013 - Darwin-dev - lists.apple.com

Re: Launchd daemon / user app communication
by Jean Suisse 29 Apr '13

29 Apr '13

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Re: Launchd daemon / user app communication
by Jens Alfke 29 Apr '13

29 Apr '13

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Re: Launchd daemon / user app communication
by Rustam Muginov 29 Apr '13

29 Apr '13

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Re: Launchd daemon / user app communication
by Jens Alfke 29 Apr '13

29 Apr '13

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Re: Launchd daemon
by Erwin Namal 29 Apr '13

29 Apr '13

Your message didn't come to late. Thank you for sending it. The code was really useful. I have taken part of it today to implement within my daemon. Now, I am looking for user app / daemon communication and will open a new thread for it. Thanks for your help. – E On 24 mars 2013, at 05:26, Sidney San Martín <sidney(a)s4y.us> wrote: > I just joined and saw this thread, might be able to fill in a couple of gaps (though as a result I don't have your email — hope you see this response). > >> - Communication will most probably be done with UNIX Domain Sockets. >> - I will need to configure the plist, which is very well explained (in an other documentation). >> >> I have also taken a look at SampleD. >> - It gets their socket from launch_data_dict_lookup(sockets_dict, "MyListenerSocket"); >> Do I need to obtain a control socket from launchd or can I register it myself using ctl_register()? > > UNIX domain sockets work great. You can even have launchd create the server end of it for you and grab it at checkin time. > > Here's some code from a project of mine that might help with this. Does it cover what you meant by "obtaining a control socket from launchd"? It also grabs a timeout — my daemon exits if it's been idle for a while, yours may not need to. (Replace log() with calls to asl_log() or your own helpful logging function): > > int launchdSocketFd = 0; > int launchdTimeout = 0; > > launch_data_t checkin_request; > launch_data_t checkin_response; > > // Check in with launchd. Even if we weren't launched by launchd these first two calls should succeed > if ((checkin_request = launch_data_new_string(LAUNCH_KEY_CHECKIN)) == NULL) { > log(ASL_LEVEL_ERR, @"launch_data_new_string(\"" LAUNCH_KEY_CHECKIN "\") Unable to create string."); > exit(EXIT_FAILURE); > } > if ((checkin_response = launch_msg(checkin_request)) == NULL) { > log(ASL_LEVEL_ERR, @"launch_msg(\"" LAUNCH_KEY_CHECKIN "\") IPC failure: %s", strerror(errno)); > exit(EXIT_FAILURE); > } > > // If we were started by launchd, get the file descriptor of the socket launchd opened for us > if (LAUNCH_DATA_DICTIONARY == launch_data_get_type(checkin_response)) { > launch_data_t sockets_dict = launch_data_dict_lookup(checkin_response, LAUNCH_JOBKEY_SOCKETS); > size_t socketCount; > if (sockets_dict && (socketCount = launch_data_dict_get_count(sockets_dict))) { > if(socketCount > 1){ > log(ASL_LEVEL_WARNING, @"Launchd gave us extra sockets, ignoring them"); > } > launch_data_t listening_fd_array = launch_data_dict_lookup(sockets_dict, "sockserverSocket"); > if (listening_fd_array && launch_data_array_get_count(listening_fd_array)) { > launchdSocketFd = launch_data_get_fd(launch_data_array_get_index(listening_fd_array, 0)); > } > } > launch_data_t timeout = launch_data_dict_lookup(checkin_response, LAUNCH_JOBKEY_TIMEOUT); > if(timeout){ > launchdTimeout = launch_data_get_integer(timeout); > } > if(!launchdSocketFd){ > log(ASL_LEVEL_ERR, @"Missing a socket to answer requests!"); > exit(EXIT_FAILURE); > } > } else { > errno = launch_data_get_errno(checkin_response); > log(ASL_LEVEL_ERR, @"Couldn't check in with launchd: %m"); > } > launch_data_free(checkin_request); > launch_data_free(checkin_response); > > > >> - How to set up my project to use Objective-C for my daemon. >> - What does my Objective-C entry point look like (int main(…) ?) >> - How do I handle SIGKILL >> - If I can't use a for/while/etc. loop, how do I prevent my daemon from exiting once the main function returns? >> - Do I need to obtain a control socket from launchd or can I register it myself using ctl_register()? >> >>> Daemos are by definition command line. >> Do you know how to select objective-C as developing language? > > Just create a Foundation command line tool! A launchd daemon can be *any* executable (though it shouldn't use AppKit), it isn't special. Your main()'ll probably look like this: > > int main () { > [MyBigFancyController new]; > [[NSRunLoop currentRunLoop] run]; > return 0; > } > > Do whatever initialization you want from main() — it can be inline, a call to a C function, or a call to one or more ObjC methods, as above. It can start listening to the domain socket you got from launchd — you're welcome to wrap it in an NSFileHandle and -acceptConnectionInBackgroundAndNotify — or open files, connect to other programs, whatever. > > The NSRunLoop is your infinite loop, the same one used by Cocoa apps, and the call to -run won't return while the it has input sources. Any evented ObjC call (NSTimer, -performSelector:afterDelay:, notification center, NSURLConnection, -acceptConnectionInBackgroundAndNotify, etc.) that can call you back at a later time registers itself with the run loop and counts as an input source, so don't worry about it. > _______________________________________________ > Do not post admin requests to the list. They will be ignored. > Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) > Help/Unsubscribe/Update your Subscription: > https://lists.apple.com/mailman/options/darwin-dev/erwin.namal%40gmail.com > > This email sent to erwin.namal(a)gmail.com _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.ap… This email sent to site_archiver(a)lists.apple.com

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Launchd daemon / user app communication
by Erwin Namal 29 Apr '13

29 Apr '13

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Re: Launchd daemon
by Erwin Namal 29 Apr '13

29 Apr '13

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Re: About new os x 10.8.3 source code
by William Siegrist 19 Apr '13

19 Apr '13

On Apr 19, 2013, at 4:31 AM, Axel Luttgens <luttgens(a)fusl.ac.be> wrote: > Le 18 avr. 2013 à 23:45, William Siegrist a écrit : > >> The open source components of OS X 10.8.3 and Developer Tools 4.6 have been posted. >> >> http://opensource.apple.com/ >> >> -Bill > > Hello Bill, > > Fine! > Once again, many thanks for making all those projects available. > > If I may: it seems that the CF-744.18 tarball in fact contains the CF-744.12 project… > There were no changes in the open source version of CF, so 744.12 and 744.18 are identical. I have fixed the directory name inside the 744.18 tarball. Thanks for catching that for me, -Bill _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.ap… This email sent to site_archiver(a)lists.apple.com

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Re: About new os x 10.8.3 source code
by Axel Luttgens 19 Apr '13

19 Apr '13

Le 18 avr. 2013 à 23:45, William Siegrist a écrit : > The open source components of OS X 10.8.3 and Developer Tools 4.6 have been posted. > > http://opensource.apple.com/ > > -Bill Hello Bill, Fine! Once again, many thanks for making all those projects available. If I may: it seems that the CF-744.18 tarball in fact contains the CF-744.12 project... Axel _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.ap… This email sent to site_archiver(a)lists.apple.com

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Re: About new os x 10.8.3 source code
by William Siegrist 18 Apr '13

18 Apr '13

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