November 2008 - Darwin-dev - lists.apple.com

Re: Semaphore
by Luke Hiesterman 30 Nov '08

30 Nov '08

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Luke Sent from my iPhone. Please suggest me. Regards rksinghal On Fri, Nov 28, 2008 at 9:54 AM, Rakesh Singhal <rakesh.singhal(a)gmail.com> wrote: Thanks. Now I am using following set of APIs: ftok() semget() semop() semctl() It is working till now :) Regards rksinghal Hi all POSIX unnamed semaphores are not supported. Use either POSIX named semaphores, or use System V semaphores: man sem_open man semget -- Terry _______________________________________________ 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… Why exactly do you want to avoid ftok? It's a good way to generate shared keys. It's always possible to generate an integer key some other way yourself and then you just have to figure out how to communicate it across processes. You could write it to a file or send it over a socket. On Nov 30, 2008, at 3:25 AM, Rakesh Singhal <rakesh.singhal(a)gmail.com> wrote: Is it possible to use semget() without using ftok() for IPC communication? On Thu, Nov 27, 2008 at 9:49 AM, Terry Lambert <tlambert(a)apple.com> wrote: On Nov 26, 2008, at 7:31 PM, Rakesh Singhal wrote: I tried to use sem_init() but I think it is not there to use. It is declared in semaphore.h but when I do man sem_init() then it gives the message "No manual entry for sem_init". Now, I am using sem_open(). I think it is right API to create unique semaphore between multi-processes. But creating it in one process if I try to create in another process, the value of semaphore is not same. I am using same name in both process(1st argument of sem_open()). Please suggest to create semaphore (cross-processes). This email sent to site_archiver(a)lists.apple.com

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Re: Semaphore
by Rakesh Singhal 30 Nov '08

30 Nov '08

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id:date:from:to :subject:cc:in-reply-to:mime-version:content-type :content-transfer-encoding:content-disposition:references; bh=DNnzPtJO0SevcZVNIN4V68TS08Lub9pJTU5iqdNrk20=; b=lNPBPgQ1EYK+9yFU/Sgz4OhiLEOGsotjouXR/vQ4LsIXYmJa5n9iIFJySBFDU71xLg 1poaJ6gp3vae6HC9GuK98c6I4cCHjwlySJa6yxxbbjFDhnm7Yp9WSuFchsAg2It78Rva t6l59Vvf0oim+2FvzMwn5/LFrmqo/GzQwfBo4= Domainkey-signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:to:subject:cc:in-reply-to:mime-version :content-type:content-transfer-encoding:content-disposition :references; b=DmYFOS2L2zbolFw1m5Jy79pNte6fspJOpcm2dvRVgyP+AXv8FlGwQHF33nx2OZ3M/D Y4CV220VyK0SsPYInDRWqNR7LYar1Zc+kJVro/JhLWRoAcu7L9XSehcY33mQoeF7gf6B IReRpv82Z8kxR65tSJB09xHGcYQeKGRG2Z4KM= Is it possible to use semget() without using ftok() for IPC communication? Please suggest me. Regards rksinghal On Fri, Nov 28, 2008 at 9:54 AM, Rakesh Singhal <rakesh.singhal(a)gmail.com> wrote: > Thanks. Now I am using following set of APIs: > > ftok() > semget() > semop() > semctl() > > It is working till now :) > > Regards > rksinghal > > On Thu, Nov 27, 2008 at 9:49 AM, Terry Lambert <tlambert(a)apple.com> wrote: >> On Nov 26, 2008, at 7:31 PM, Rakesh Singhal wrote: >>> >>> Hi all >>> >>> I tried to use sem_init() but I think it is not there to use. It is >>> declared in semaphore.h but when I do man sem_init() then it gives the >>> message "No manual entry for sem_init". >>> >>> Now, I am using sem_open(). I think it is right API to create unique >>> semaphore between multi-processes. But creating it in one process if I >>> try to create in another process, the value of semaphore is not same. >>> I am using same name in both process(1st argument of sem_open()). >>> >>> Please suggest to create semaphore (cross-processes). >> >> POSIX unnamed semaphores are not supported. >> >> Use either POSIX named semaphores, or use System V semaphores: >> >> man sem_open >> man semget >> >> -- Terry >> > _______________________________________________ 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: launchd and mach ports: Sample code?
by Damien Sorresso 29 Nov '08

29 Nov '08

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Would there be a Darwin daemon using Mach Port to be started? _______________________________________________ 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 On Nov 29, 2008, at 3:35 PM, Jean-Daniel Dupas wrote: Le 29 nov. 08 à 14:56, Iceberg-Dev a écrit : Is there any official or unofficial sample code showing how to trigger a launchd process using Mach Port? According to TN 2083, it is possible starting with Mac OS X 10.5 to start a daemon with launchd using a Mach Port. (1) I looked for sample code in the documentation, Technote and Google with no results so far. I think you just use the launchd API just like it's done in SampleD (http://developer.apple.com/samplecode/SampleD/ ). But instead of retreiving sockets (using LAUNCH_JOBKEY_SOCKETS and launch_data_get_fd()) you retreive your mach port (using LAUNCH_JOBKEY_MACHSERVICES and launch_data_get_machport()). The way to define a service in your plist is defined in the MachServices section of launchd.plist reference (man launchd.plist). And in the client application, you retreive it using bootstrap_look_up() (from <servers/bootstrap.h>). You can use the launch(3) API, but it's far easier to just use bootstrap_check_in() to get your receive right. -- Damien Sorresso BSD Engineering Apple Inc. smime.p7s

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Re: launchd and mach ports: Sample code?
by Jean-Daniel Dupas 29 Nov '08

29 Nov '08

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Le 29 nov. 08 à 14:56, Iceberg-Dev a écrit : Would there be a Darwin daemon using Mach Port to be started? _______________________________________________ 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… Is there any official or unofficial sample code showing how to trigger a launchd process using Mach Port? According to TN 2083, it is possible starting with Mac OS X 10.5 to start a daemon with launchd using a Mach Port. (1) I looked for sample code in the documentation, Technote and Google with no results so far. I think you just use the launchd API just like it's done in SampleD (http://developer.apple.com/samplecode/SampleD/ ). But instead of retreiving sockets (using LAUNCH_JOBKEY_SOCKETS and launch_data_get_fd()) you retreive your mach port (using LAUNCH_JOBKEY_MACHSERVICES and launch_data_get_machport()). The way to define a service in your plist is defined in the MachServices section of launchd.plist reference (man launchd.plist). And in the client application, you retreive it using bootstrap_look_up() (from <servers/bootstrap.h>). This email sent to site_archiver(a)lists.apple.com

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launchd and mach ports: Sample code?
by Iceberg-Dev 29 Nov '08

29 Nov '08

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:mime-version :content-transfer-encoding:message-id:content-type:to:from:subject :date:x-mailer; bh=cdg/VU0ZiPjjNlJ59OPX0/IRlgL05JuhgG+H6/78CDE=; b=EQqNDRRD4ssL1WTocwSLhEBIS2ZYZyftgIWUgUWrS1n7fM/Vo2K3orfmyN/P3eUAWP ICxbDMReAfyf2lA2C6fyY33zkjkzI/xDgO5e9Qbtd+b5mQmrpg4XhnYbLFT7+Z/0XtMt I02Z0G8soImr9wSAbYvMTWxCzGT1bQMpUUWZo= Domainkey-signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:content-transfer-encoding:message-id:content-type:to :from:subject:date:x-mailer; b=uAKPwILxjAmAmF6JDhrENNqxyB3LybNOQ+XNyhCFbPAGfn5Rm79E48/wduzcA3qu8K z52qTUyfN5Ib2yNUGyNRAm5fX4i7li31tCMstBiovMkR1DbEHVTXWdKr/s7L2i75JZ98 08q3jbsmXU+r9D9axvxoDSDbPx3toz1Nk//q4= Would there be a Darwin daemon using Mach Port to be started? _______________________________________________ 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… Is there any official or unofficial sample code showing how to trigger a launchd process using Mach Port? According to TN 2083, it is possible starting with Mac OS X 10.5 to start a daemon with launchd using a Mach Port. (1) I looked for sample code in the documentation, Technote and Google with no results so far. (1) I thought Mach Port were supposed to have been working in 10.4 too... This email sent to site_archiver(a)lists.apple.com

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Re: Semaphore
by Rakesh Singhal 28 Nov '08

28 Nov '08

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id:date:from:to :subject:cc:in-reply-to:mime-version:content-type :content-transfer-encoding:content-disposition:references; bh=VCuiFb7u1s1y3C3SNS9GbUI+vmLL/Q43lXoO+xUdicg=; b=QjBKCsm/0aI1UOzQW4U+SjVaCz+EOn/Qd9HWUjnlmdXMuTG+Du/1DT5EmzuuryZuLc /4Gvv4VoKDxvMSpb0tnjUcmVYykQjQtej/yw0Lx3wHLdwd/9rOkOIy1VUccmDitkq2LV YKW1Q7pAFgvkS9cu1ndmQX0KXWKsumAHfHKgY= Domainkey-signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:to:subject:cc:in-reply-to:mime-version :content-type:content-transfer-encoding:content-disposition :references; b=UMQuHq4T0tFFTyEapcnzJT13kUBofGard4kCAl3/NPlGzqGM7nLySjBCvtXjqa+Qu7 d01PXbAa17KKFM1VBNQp0pIW1eXx/aV2YBYlXSqAy9V882XPWbX2YifSqsanKIf8AF9h 99T/y85MuBCCye1i3WL9UdF4IsiRc7MI2cQMo= Thanks. Now I am using following set of APIs: ftok() semget() semop() semctl() It is working till now :) Regards rksinghal On Thu, Nov 27, 2008 at 9:49 AM, Terry Lambert <tlambert(a)apple.com> wrote: > On Nov 26, 2008, at 7:31 PM, Rakesh Singhal wrote: >> >> Hi all >> >> I tried to use sem_init() but I think it is not there to use. It is >> declared in semaphore.h but when I do man sem_init() then it gives the >> message "No manual entry for sem_init". >> >> Now, I am using sem_open(). I think it is right API to create unique >> semaphore between multi-processes. But creating it in one process if I >> try to create in another process, the value of semaphore is not same. >> I am using same name in both process(1st argument of sem_open()). >> >> Please suggest to create semaphore (cross-processes). > > POSIX unnamed semaphores are not supported. > > Use either POSIX named semaphores, or use System V semaphores: > > man sem_open > man semget > > -- Terry > _______________________________________________ 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: Semaphore
by Terry Lambert 27 Nov '08

27 Nov '08

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com -- Terry _______________________________________________ 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… On Nov 26, 2008, at 8:25 PM, Eli Bach <ebach2(a)gmail.com> wrote: On Nov 26, 2008, at 7:31 PM, Rakesh Singhal wrote: Please suggest to create semaphore (cross-processes). For stuff like this, where the documentation is either lacking or not there at all, I find banging in "macosx function/tool/etc" into google to provide a lot of useful information. As well as specifically searching in lists.apple.com for Mac- specific API's. I'll save him the trouble. sem_init() is a function for use on unnamed semaphores, which are not supported in Mac OS X (this is pretty clear if you include <unistd.h> and check the feature test macro _POSIX_SHARED_MEMORY_OBJECTS). If sem_init() is called, it will send the calling process a SIGSYS and cause it to abort. If the signal is caught, the function will return ENOSYS. So no matter what you do, it's not going to do anything useful. It would not be terrifically useful to document unsupported functions like sem_init(). This email sent to site_archiver(a)lists.apple.com

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Re: Semaphore
by Eli Bach 27 Nov '08

27 Nov '08

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id:from:to :in-reply-to:content-type:content-transfer-encoding:mime-version :subject:date:references:x-mailer; bh=RrY4IqGtNY4Ne68zMItkHDdHQprUHccRDnqXfm2MjqA=; b=YEMMGKDZq/ZXADAZ++a/FhUz/KDbkHYosmtRZpN+HaL4wbNr8kAHs1CaTsu32jiuPL AYo3PIBTF2B6WwyHSW/+k3ud7l4Z3RIGjVNdrPExNqOkJcxIl6fHPhIl3+vGprLYBUT7 9RzUMAZgAxsN8Ql5xkc1RdvWtmNN3YB/68kDM= Domainkey-signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:from:to:in-reply-to:content-type :content-transfer-encoding:mime-version:subject:date:references :x-mailer; b=snirau3WntTon3IpoDQIQgb3fNnyPKPRG8TOfXBs2hlbFr061Iaf0t7ZwJzkE12Id/ j9CB96+pGLFr09AYk0kjVnTDRT38KKzPp+SSBL0umv4valUv/NFAiPzu4rQWGgTjtVw2 RRKqVooEsSgsjhSUjiM0cgCNtYZWzlJkVNw3w= On Nov 26, 2008, at 7:31 PM, Rakesh Singhal wrote: Eli _______________________________________________ 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… Please suggest to create semaphore (cross-processes). For stuff like this, where the documentation is either lacking or not there at all, I find banging in "macosx function/tool/etc" into google to provide a lot of useful information. As well as specifically searching in lists.apple.com for Mac-specific API's. This email sent to site_archiver(a)lists.apple.com

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Re: Semaphore
by Terry Lambert 27 Nov '08

27 Nov '08

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Hi all I tried to use sem_init() but I think it is not there to use. It is declared in semaphore.h but when I do man sem_init() then it gives the message "No manual entry for sem_init". Now, I am using sem_open(). I think it is right API to create unique semaphore between multi-processes. But creating it in one process if I try to create in another process, the value of semaphore is not same. I am using same name in both process(1st argument of sem_open()). POSIX unnamed semaphores are not supported. Use either POSIX named semaphores, or use System V semaphores: man sem_open man semget -- Terry _______________________________________________ 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… On Nov 26, 2008, at 7:31 PM, Rakesh Singhal wrote: Please suggest to create semaphore (cross-processes). This email sent to site_archiver(a)lists.apple.com

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Re: Semaphore
by Luke Hiesterman 27 Nov '08

27 Nov '08

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Try semget along with the flag IPC_CREAT. Luke Sent from my iPhone. Hi all I tried to use sem_init() but I think it is not there to use. It is declared in semaphore.h but when I do man sem_init() then it gives the message "No manual entry for sem_init". Now, I am using sem_open(). I think it is right API to create unique semaphore between multi-processes. But creating it in one process if I try to create in another process, the value of semaphore is not same. I am using same name in both process(1st argument of sem_open()). Please suggest to create semaphore (cross-processes). Regards rksinghal _______________________________________________ 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/luketheh%40apple.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… On Nov 26, 2008, at 7:31 PM, Rakesh Singhal <rakesh.singhal(a)gmail.com> wrote: This email sent to luketheh(a)apple.com This email sent to site_archiver(a)lists.apple.com

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