July 2011 - Darwin-dev - lists.apple.com

Re: Why does launchd keep running my server after it quits?
by Axel Luttgens 18 Jul '11

18 Jul '11

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Le 18 juil. 2011 à 02:55, mailist(a)ericgorr.net a écrit : > If there is a better mailing list for this question, please let me know. > > I've got a sample project at: http://ericgorr.net/pq/CST2.zip > > In my system.log, I keep seeing the following output: > > Jul 17 20:50:35 Glamdring server[2594]: Hello, the server is here... > Jul 17 20:50:35 Glamdring server[2594]: server_check_in... 5 > Jul 17 20:50:35 Glamdring server[2594]: Hello, the server is going away ... > Jul 17 20:50:35 Glamdring com.apple.launchd[1] (net.ericgorr.server): Throttling respawn: Will start in 10 seconds > Jul 17 20:50:45 Glamdring server[2602]: Hello, the server is here... > Jul 17 20:50:45 Glamdring server[2602]: server_check_in... 5 > Jul 17 20:50:45 Glamdring server[2602]: Hello, the server is going away ... > Jul 17 20:50:45 Glamdring com.apple.launchd[1] (net.ericgorr.server): Throttling respawn: Will start in 10 seconds > > > The plist for the server looks likes: > > <?xml version="1.0" encoding="UTF-8"?> > <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd"> > <plist version="1.0"> > <dict> > <key>EnableTransactions</key> > <true/> > <key>Label</key> > <string>net.ericgorr.server</string> > <key>Program</key> > <string>/usr/local/libexec/server</string> > <key>KeepAlive</key> > <false/> > <key>ProgramArguments</key> > <array> > <string>server</string> > <string>launchd</string> > </array> > <key>RunAtLoad</key> > <false/> > <key>Sockets</key> > <dict> > <key>net.ericgorr.server.sock</key> > <dict> > <key>Bonjour</key> > <string>server</string> > <key>SockServiceName</key> > <string>1139</string> > </dict> > </dict> > </dict> > </plist> > > However, when I do: > > ~ $launchctl list net.ericgorr.server > { > "Label" = "net.ericgorr.server"; > "LimitLoadToSessionType" = "System"; > "OnDemand" = true; > "LastExitStatus" = 0; > "TimeOut" = 30; > "Program" = "/usr/local/libexec/server"; > "ProgramArguments" = ( > "server"; > "launchd"; > ); > "EnableTransactions" = true; > "TransactionCount" = -1; > "Sockets" = { > "net.ericgorr.server.sock" = ( > file-descriptor-object; > file-descriptor-object; > ); > }; > }; > > > Is there any reason why it replaced my KeepAlive and RunAtLoad keys with the deprecated OnDemand key? Hello, For the latter, I think it's more an artifact of the output of "launchctl list" than anything else. > The sample project really doesn't do anything yet. It's only purpose is to get something simple working...connect to a launchd server and then watch it go away normally. As far as I can tell, your server currently quits immediately; this is interpreted by launchd as a failure that occurred while launching the daemon (at least, this used to be case). Could you try by inserting a delay of ten seconds or more between your two NSLog() statements? HTH, 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: 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: Debugging process launching code
by Dave Keck 18 Jul '11

18 Jul '11

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=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc:content-type; bh=coK6LkCdnM2n1uOvPA/Ftm+YQxoGWEPAwbaEDIWaSIM=; b=x90ic9TfOPrPvqpL7ndN1xkqBjW/JqKB60IYhTRLtRyebtfYib6y3esfBnG2ecVzIZ RbceTuxht8p1qKACdDaVRfAl9WBnaFu98aminwUhcrEXANsqgf+kFCxaqc+1ThCguyUE mX8sqZ7kwi4PuQaeuMt5+SWWIyV4Gj4oM3wBI= > How would you debug a problem like this? Determine why forkpty() is failing by checking errno; see 'man forkpty'. Perhaps you aren't closing your file descriptors. > Are there pitfalls and limitations in process launching that I ought to know about? Yes, there are limitations on forking; see 'man fork'. You need to wait on your child processes to have their state cleaned up within the kernel. Failing to do so will prevent you from forking new processes. _______________________________________________ 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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Debugging process launching code
by Ingemar Ragnemalm 18 Jul '11

18 Jul '11

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com User-agent: Thunderbird 2.0.0.24 (Macintosh/20100228) Quitting and re-launching the IDE helps, every time. My processes are launched using forkpty, and only one at a time. /Ingemar _______________________________________________ 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 am mostly a lurker on the Darwin list since I don't feel I can contribute much, but now I feel I must ask for help on this. For several years, I have been working on my own IDE in my spare time. It is a rather different IDE, extremely minimalistic, looks like a simple editor at first glance, but with a lot of parsing and decision making under the hood. Well, I won't try selling it, I have almost given that up, but I will keep developing it for myself and the few fans it has, because it works just the way I want it to. But it has one single bug that annoys any user including myself: The process management occasionally locks up, totally, so I can't start any processes at all from the program. I have tried finding the bug by starting and stopping lots of processes, but whenever I do that the bug doesn't surface at all. But in normal use, it happens, randomly. There can be hours of use with hundreds of process launches, and then it stops working. How would you debug a problem like this? Are there pitfalls and limitations in process launching that I ought to know about? When will the OS just refuse to fork a process? This email sent to site_archiver(a)lists.apple.com

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Why does launchd keep running my server after it quits?
by mailist＠ericgorr.net 18 Jul '11

18 Jul '11

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com User-agent: Roundcube Webmail/0.5.2 I've got a sample project at: http://ericgorr.net/pq/CST2.zip In my system.log, I keep seeing the following output: The plist for the server looks likes: However, when I do: ~ $launchctl list net.ericgorr.server { "Label" = "net.ericgorr.server"; "LimitLoadToSessionType" = "System"; "OnDemand" = true; "LastExitStatus" = 0; "TimeOut" = 30; "Program" = "/usr/local/libexec/server"; "ProgramArguments" = ( "server"; "launchd"; ); "EnableTransactions" = true; "TransactionCount" = -1; "Sockets" = { "net.ericgorr.server.sock" = ( file-descriptor-object; file-descriptor-object; ); }; }; Thank you. _______________________________________________ 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 there is a better mailing list for this question, please let me know. Jul 17 20:50:35 Glamdring server[2594]: Hello, the server is here... Jul 17 20:50:35 Glamdring server[2594]: server_check_in... 5 Jul 17 20:50:35 Glamdring server[2594]: Hello, the server is going away ... Jul 17 20:50:35 Glamdring com.apple.launchd[1] (net.ericgorr.server): Throttling respawn: Will start in 10 seconds Jul 17 20:50:45 Glamdring server[2602]: Hello, the server is here... Jul 17 20:50:45 Glamdring server[2602]: server_check_in... 5 Jul 17 20:50:45 Glamdring server[2602]: Hello, the server is going away ... Jul 17 20:50:45 Glamdring com.apple.launchd[1] (net.ericgorr.server): Throttling respawn: Will start in 10 seconds <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd"> <plist version="1.0"> <dict> <key>EnableTransactions</key> <true/> <key>Label</key> <string>net.ericgorr.server</string> <key>Program</key> <string>/usr/local/libexec/server</string> <key>KeepAlive</key> <false/> <key>ProgramArguments</key> <array> <string>server</string> <string>launchd</string> </array> <key>RunAtLoad</key> <false/> <key>Sockets</key> <dict> <key>net.ericgorr.server.sock</key> <dict> <key>Bonjour</key> <string>server</string> <key>SockServiceName</key> <string>1139</string> </dict> </dict> </dict> </plist> Is there any reason why it replaced my KeepAlive and RunAtLoad keys with the deprecated OnDemand key? The sample project really doesn't do anything yet. It's only purpose is to get something simple working...connect to a launchd server and then watch it go away normally. I'm sure I'm doing something obviously wrong, but I am not sure what that might be... This email sent to site_archiver(a)lists.apple.com

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Where Finder gets info for "Get Info" attributes.
by Anatol Pomozov 08 Jul '11

08 Jul '11

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