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

Re: Dylib Embedded Lib Paths
by Shantonu Sen 10 Apr '05

10 Apr '05

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com shantonu On Apr 9, 2005, at 7:43 PM, Jeshua Lacock wrote: On Apr 9, 2005, at 6:51 PM, Gregory Seidman wrote: Thank you kindly! That tool sure is a thing of beauty, it did exactly the trick! Thanks again, Jeshua Lacock __________________________ Programmer/Owner Phone: 877.240.1364 http://OpenOSX.com Fax: 415.462.6211 -_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_ This email sent to ssen(a)opendarwin.org _______________________________________________ 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: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… You shouldn't be using it. You should be linking your dylibs correctly in the first place, using the -install_name option to gcc. The tool you are looking for is named install_name_tool, and it's shipped with the MacOS X developer tools. I haven't used pure darwin, but I suspect that the same tool is included and, presumably, has the same man page. _______________________________________________ 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: http://lists.apple.com/mailman/options/darwin-dev/ssen% 40opendarwin.org This email sent to site_archiver(a)lists.apple.com

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Re: Dylib Embedded Lib Paths
by Jeshua Lacock 10 Apr '05

10 Apr '05

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com On Apr 9, 2005, at 6:51 PM, Gregory Seidman wrote: Thank you kindly! That tool sure is a thing of beauty, it did exactly the trick! Thanks again, Jeshua Lacock __________________________ Programmer/Owner Phone: 877.240.1364 http://OpenOSX.com Fax: 415.462.6211 -_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_ _______________________________________________ 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: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… The tool you are looking for is named install_name_tool, and it's shipped with the MacOS X developer tools. I haven't used pure darwin, but I suspect that the same tool is included and, presumably, has the same man page. This email sent to site_archiver(a)lists.apple.com

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Re: Dylib Embedded Lib Paths
by Gregory Seidman 10 Apr '05

10 Apr '05

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Mail-followup-to: darwin-dev(a)lists.apple.com User-agent: Mutt/1.5.6+20040907i On Sat, Apr 09, 2005 at 06:44:53PM -0600, Jeshua Lacock wrote: } I often run into a common problem when using Mach-O dynamically linked } shared libraries (dylibs), sometimes the paths to the linked, dependent } shared dylibs are to my source directory (or somewhere else), and not } to the distribution directory (eg a dylib is linked to: } "/usr/src/foo/libfoo.dylib" instead "/usr/foo/lib/libfoo.dylib"). This } of course creates problems unless I export the DYLD_LIBRARY_PATH } environment variable including the "/usr/foo/lib" path. in many cases, } resorting on DYLD_LIBRARY_PATH is far from ideal. } } Does anyone know if it is possible to change the linked paths, short of } relinking the library, or using DYLD_LIBRARY_PATH? It seems like there } should be a way to just edit the path, which would be ideal. I can see } that the linked library paths are just strings of text, so it seems } plausible to edit them somehow. The tool you are looking for is named install_name_tool, and it's shipped with the MacOS X developer tools. I haven't used pure darwin, but I suspect that the same tool is included and, presumably, has the same man page. } Any advice or hints would be greatly appreciated. } Thanks, } Jeshua Lacock ___________________________ --Greg _______________________________________________ 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: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… This email sent to site_archiver(a)lists.apple.com

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Dylib Embedded Lib Paths
by Jeshua Lacock 10 Apr '05

10 Apr '05

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Greetings, Any advice or hints would be greatly appreciated. Thanks, Jeshua Lacock ___________________________ Programmer/Owner Phone: 877.240.1364 http://OpenOSX.com Fax: 415.462.6211 -_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_ _______________________________________________ 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: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… I often run into a common problem when using Mach-O dynamically linked shared libraries (dylibs), sometimes the paths to the linked, dependent shared dylibs are to my source directory (or somewhere else), and not to the distribution directory (eg a dylib is linked to: "/usr/src/foo/libfoo.dylib" instead "/usr/foo/lib/libfoo.dylib"). This of course creates problems unless I export the DYLD_LIBRARY_PATH environment variable including the "/usr/foo/lib" path. in many cases, resorting on DYLD_LIBRARY_PATH is far from ideal. Does anyone know if it is possible to change the linked paths, short of relinking the library, or using DYLD_LIBRARY_PATH? It seems like there should be a way to just edit the path, which would be ideal. I can see that the linked library paths are just strings of text, so it seems plausible to edit them somehow. This email sent to site_archiver(a)lists.apple.com

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Re: Correction: Serial port arbitration
by Gregory Weston 09 Apr '05

09 Apr '05

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com On Apr 9, 2005, at 4:21 AM, Dan Bernstein wrote: I had a similar problem with the code. Solved it by turning on the CLOCAL bit in the termios struct's c_cflag field and turning off CCTLS_FLOW and CRTS_IFLOW. Here's my setup code: struct termios options; if ( tcgetattr( fd, &options )==-1 ) { /* throw an exception */ } cfmakeraw(&options); options.c_cc[VMIN] = 1; // characters options.c_cc[VTIME] = 10; // tenths of a second if ( cfsetspeed( &options, B57600 )==-1 ) // Set 57600 baud { /* throw an exception */ } options.c_cflag |= ( CS8 | CLOCAL ); // Use 8 bit words, ignore status lines _______________________________________________ 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: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… if ( tcsetattr( [modemFileHandle fileDescriptor], TCSANOW, &options )==-1 ) { /* throw an exception */ } That looks like a success in my testbed app. I'll try it in the real project later. Thanks very much. This email sent to site_archiver(a)lists.apple.com

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Re: Correction: Serial port arbitration
by Dan Bernstein 09 Apr '05

09 Apr '05

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Domainkey-signature: a=rsa-sha1; q=dns; c=nofws; s=beta; d=gmail.com; h=received:message-id:date:from:reply-to:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:references; b=qZK+jTiTAPtgextvbu65RqkBQIsPf4bHhEV/fglH1AqK/2D/MPSf0lumq9iKE+SFAjgt9Yb8CLsHqtraHT7reWvCdlllwdjmyh2nJ615rcJqUd406eTzuvB1/bKd95Xyh4PZ5nS9wHMmYDUonz4HY4CGBkNeL8ToZk2S8GGlYy0= I had a similar problem with the code. Solved it by turning on the CLOCAL bit in the termios struct's c_cflag field and turning off CCTLS_FLOW and CRTS_IFLOW. Here's my setup code: struct termios options; if ( tcgetattr( fd, &options )==-1 ) { /* throw an exception */ } cfmakeraw(&options); options.c_cc[VMIN] = 1; // characters options.c_cc[VTIME] = 10; // tenths of a second if ( cfsetspeed( &options, B57600 )==-1 ) // Set 57600 baud { /* throw an exception */ } options.c_cflag |= ( CS8 | CLOCAL ); // Use 8 bit words, ignore status lines if ( tcsetattr( [modemFileHandle fileDescriptor], TCSANOW, &options )==-1 ) { /* throw an exception */ } On Apr 8, 2005 10:24 PM, Gregory Weston <gweston(a)mac.com> wrote: > On Apr 8, 2005, at 2:42 PM, Godfrey van der Linden wrote: > > > Have you ever succeeded in talking to your serial device? Before > > going into arbitration just try to setup a simple program that sends > > an AT<CR> to the device and make sure you are getting an OK? If you > > aren't then you have other issues. > > BTW did you use O_NONBLOCK as one of the open flags or are you using > > the /dev/cu.??? device? > > I've been working with the code as presented mostly, which has been do > the open() non-blocking but then clearing that flag. > > The summary of my experiments is that if I open the cu.* device I can > write all I like and get responses/echos but never get a RING. If I > open the tty.* device, I can get a RING but if I make any attempt to > write to the file it blocks. > > If I leave it in non-blocking mode, the write() to tty.* gives back > EAGAIN. > > > > Godfrey > > > > On Apr 7, , at 18:21, Gregory Weston wrote: > > > >> Godfrey van der Linden wrote: > >> > >> > >>> // At this point you have the port exclusively and non-preemtibly > >>> // so now is a good time to program up the modem or do any other > >>> // equipment initialisation you desire. > >>> > >> > >> Not to be terribly dense, but how? If I try to send an initialization > >> string via write() I block forever. > >> > >> Adding O_RDWR to the open() flags had no impact. > >> > > _______________________________________________ > 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: > http://lists.apple.com/mailman/options/darwin-dev/dan.bernstein%40gmail.com > > This email sent to dan.bernstein(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: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… This email sent to site_archiver(a)lists.apple.com

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Re: Correction: Serial port arbitration
by Gregory Weston 08 Apr '05

08 Apr '05

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com On Apr 8, 2005, at 2:42 PM, Godfrey van der Linden wrote: Godfrey On Apr 7, , at 18:21, Gregory Weston wrote: Godfrey van der Linden wrote: // At this point you have the port exclusively and non-preemtibly // so now is a good time to program up the modem or do any other // equipment initialisation you desire. Adding O_RDWR to the open() flags had no impact. _______________________________________________ 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: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… Have you ever succeeded in talking to your serial device? Before going into arbitration just try to setup a simple program that sends an AT<CR> to the device and make sure you are getting an OK? If you aren't then you have other issues. BTW did you use O_NONBLOCK as one of the open flags or are you using the /dev/cu.??? device? I've been working with the code as presented mostly, which has been do the open() non-blocking but then clearing that flag. The summary of my experiments is that if I open the cu.* device I can write all I like and get responses/echos but never get a RING. If I open the tty.* device, I can get a RING but if I make any attempt to write to the file it blocks. If I leave it in non-blocking mode, the write() to tty.* gives back EAGAIN. Not to be terribly dense, but how? If I try to send an initialization string via write() I block forever. This email sent to site_archiver(a)lists.apple.com

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Re: Correction: Serial port arbitration
by Godfrey van der Linden 08 Apr '05

08 Apr '05

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Godfrey On Apr 7, , at 18:21, Gregory Weston wrote: Godfrey van der Linden wrote: // At this point you have the port exclusively and non-preemtibly // so now is a good time to program up the modem or do any other // equipment initialisation you desire. Adding O_RDWR to the open() flags had no impact. _______________________________________________ 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: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… Have you ever succeeded in talking to your serial device? Before going into arbitration just try to setup a simple program that sends an AT<CR> to the device and make sure you are getting an OK? If you aren't then you have other issues. BTW did you use O_NONBLOCK as one of the open flags or are you using the /dev/cu.??? device? Not to be terribly dense, but how? If I try to send an initialization string via write() I block forever. This email sent to site_archiver(a)lists.apple.com

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Flushing a semaphore ?
by Stéphane Letz 08 Apr '05

08 Apr '05

site_archiver(a)lists.apple.com Delivered-To: Darwin-dev(a)lists.apple.com client_1_thread : ----------------------- loop { semaphore_wait(client_1_sem) .... do_some_process(...) .... semaphore_signal(client_2_sem) } client_2_thread : ----------------------- loop { semaphore_wait(client_2_sem) .... do_some_process(...) .... semaphore_signal(client_3_sem) } .... third client server_thread : -------------------- loop { semaphore_signal(client_1_sem) wait_some_time() } Thanks in advance Stephane Letz _______________________________________________ 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: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… We are using semaphores (the mach API defined in <mach/semaphore.h> ) to synchronize threads in different process in a server/client system. The server signal a first client, that does some processing, then the first client signal a second client, and so on : The server_thread does not synchronize on client processing end but runs at a periodic rate. In normal situation all clients are supposed to run in the server period. If clients are late, they are cases where the semaphore get signaled several times before the waiting thread get actually waken up. When the thread finally wakes up, it is able to "catch up" by running several cycles up to the point the client input semaphore blocks again. This is generally fine, but in some cases, we have to consider that a client is really too late and we would like to "reset" its input semaphore (actually loosing all pending signals that where accumulated from the previous component in the chain, the server of another client) Is there a way to "flush/reset" a semaphore to have to desired behaviour? This email sent to site_archiver(a)lists.apple.com

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Re: Correction: Serial port arbitration
by Gregory Weston 08 Apr '05

08 Apr '05

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Godfrey van der Linden wrote: // At this point you have the port exclusively and non-preemtibly // so now is a good time to program up the modem or do any other // equipment initialisation you desire. Adding O_RDWR to the open() flags had no impact. G _______________________________________________ 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: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… Not to be terribly dense, but how? If I try to send an initialization string via write() I block forever. This email sent to site_archiver(a)lists.apple.com

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