August 2009 - Darwin-dev - lists.apple.com

Re: telnet daemon
by Jean-Daniel Dupas 21 Aug '09

21 Aug '09

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Le 21 août 2009 à 20:59, Ariel Feinerman a écrit : Hi developers, _______________________________________________ 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 must write simple telnetd for Mac as an exam, but I have never write network programme, I look for exist telnet in the Darwin source to look at it, but I could not find ... Is there telnet for Darwin? If you goal is to learn network programming, I don't think reading the source of telnet is the first thing to do. Search for BSD socket tutorial on google. This email sent to site_archiver(a)lists.apple.com

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Re: telnet daemon
by Kevin Van Vechten 21 Aug '09

21 Aug '09

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com On Aug 21, 2009, at 12:24 PM, Ariel Feinerman wrote: Thank you, I found libtelnet-7 package only, is it? 2009/8/21 Eli Bach <ebach2(a)gmail.com> On Aug 21, 2009, at 11:59 AM, Ariel Feinerman wrote: Hi developers, Yes. telnetd source darwin telnetd source _______________________________________________ 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'll also want to look at the remote_cmds project which has telnet and telnetd (both of which use libtelnet as well). I must write simple telnetd for Mac as an exam, but I have never write network programme, I look for exist telnet in the Darwin source to look at it, but I could not find ... Is there telnet for Darwin? You could try typing in things like this in your browsers search field: Eli This email sent to site_archiver(a)lists.apple.com

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Re: telnet daemon
by Ariel Feinerman 21 Aug '09

21 Aug '09

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:mime-version:received:in-reply-to:references :date:message-id:subject:from:to:cc:content-type; bh=QgMm5612IMXh3YeO+h0m8lEczmY4VUIdzq5OgkE3ZwM=; b=S3SxK6RcA24S5s/ORrFRkXfpvITOnGf5TDqdOSsURoewVx5edGWgXxKSS4/2PQmA8P ZImUkUhF4RQ1AH98tJIvRn8TI6GBbJ0VVWOPck2JeHITTHCPuvmwCcGpFWb4N990ZWYi X4swyscte+5iZibZrA9d6dfX2QkDDn9DFZytk= Domainkey-signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type; b=ryNdrEoIz9asJEqlKWmU69tVBC5tmWX4947gP5KeCy3SYjw3t5nS6jv9uJLsYdtLbs MhpWOCi0ydGsaWdTilOmGL9TXvWW8dCeUQ0f5Gg8JmE1BpFigxUt33l9Glf4chDc4uB6 JHN94QPU2L6b+kPp7FaayVH+89CI3gA5f6ung= _______________________________________________ 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: telnet daemon
by Eli Bach 21 Aug '09

21 Aug '09

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:subject :mime-version:date:references:x-mailer; bh=WTXoXpMZV9N5fY1IDHDsCm6yU5XbxN7Jvv9KmkuyjK8=; b=SeNYokuHOOsV2JL+w/xz1ftbmsXjysUpQihlo1SSvyq4Ki42yIHLP1pYmusVtJeEKg D7ajCGeB0tLAmJ1HCPJA4cfOYOej+VMErJasapX/+1lu7fmOPFRLW8th5vhEL5p+W2LI Dy5OMJgo/ccTe7ynGdhkXJ0AauvT9Dm9wrzcQ= 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:subject:mime-version:date:references :x-mailer; b=UTOOYb1kIlMTPkTfgF0WOKBGWK7uJx6wUtXcsUJ279d+Pltfx7J4BBrJSjNX+o8t/y 3sdrMwF5KHSZRsUIUYS1TRYo5BCG78pHbYHpye20S6nZlyLhvLiMatWHubxAteKy6JxJ l6nkUIKUEComsw8nkBKdVHxMMTe7tC5aJr7fc= On Aug 21, 2009, at 11:59 AM, Ariel Feinerman wrote: Hi developers, Yes. You could try typing in things like this in your browsers search field: telnetd source darwin telnetd source 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… I must write simple telnetd for Mac as an exam, but I have never write network programme, I look for exist telnet in the Darwin source to look at it, but I could not find ... Is there telnet for Darwin? This email sent to site_archiver(a)lists.apple.com

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telnet daemon
by Ariel Feinerman 21 Aug '09

21 Aug '09

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:mime-version:received:date:message-id:subject :from:to:content-type; bh=u9SfpiClaJSOhaA6iSd4QeaG+nNX7Ve9XnBxERPo4eo=; b=CyswvaHrw42twtvRlJN3yObQVev4B5YgXB18f6HuYs9mGsb6LQtI1HJxoOo4/5Qvq1 FsNKhwIHbqlP98regdNJob/IJGe6nnnOZ9r6AJLsIOTIT+IjzzeqUQ8xpdyiElZRK/dO dIm1l838gpftDtr3ULXodObTp16kvBFcRqXwg= Domainkey-signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:date:message-id:subject:from:to:content-type; b=RG2+VwhUwpkRWpo/HOXESA5MGoV/FHvQCB6fDCm5bpnwPNaWKUuFFO4W930npHcmFD ff52rETAsNtWsxswTwyQHrRQwWE8o9MEe8F2Jz6A+CP/0YrjydIcXkNzI4VUrUaHOhSC tKpJJRgNIUy1FR2yCAl3zoHZKgIKsN9j7WuC8= _______________________________________________ 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: CFFileDescriptor fd leak?
by A.M. 21 Aug '09

21 Aug '09

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com On Aug 21, 2009, at 12:58 AM, Dave Keck wrote: davekeck 4880 alex 4u KQUEUE count=0, state=0 Woops, I excluded this line in that code: CFFileDescriptorEnableCallBacks(fileDescriptor, kCFFileDescriptorReadCallBack); Also, why isn't the CFFileDescriptor source posted (http://www.opensource.apple.com/source/CF/CF-476.19/)? Cheers, M _______________________________________________ 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 shaved down the code from the previous email from code which did indeed add the CFFileDescriptor to the runloop and leaked. However, I did not remove the source from the runloop manually like you do above and the Apple example code ( http://developer.apple.com/documentation/CoreFoundation/Reference/CFFileDes…) doesn't remove the runloop source either. Unfortunately, the code you laid out above does indeed sometimes leak a single kqueue fd (OS 10.5.8): Add that after the CFRunLoopAddSource() line. For me, this always prevents the leaks (also on 10.5.8.) Does that do it for you? Thanks- that works. I found the main difference in the usage that leaks and the one that doesn't is the removal of the source from the runloop (the Apple sample code doesn't use it either). I assumed that the CFFileDescriptorInvalidate function takes care of the removal from the runloop, but apparently not. Unfortunately, in my application, it would be difficult to track the runloops that the CFFileDescriptor is scheduled on. Tracking when runloops come and go via NSThread death notifications is annoying and error-prone. At least it is not leaking threads. Speaking of which, why does each file descriptor need to be watched by a new thread? Not even CFSocketManager is that dumb. In any case, this is looking so bad that I will likely need to implement my own CFFileDescriptor replacement. I'd imagine creating one thread per monitored CFFD would be significantly easier to implement than creating one centralized thread for every monitored CFFD. Also, a thread blocked in kevent() waiting for an event is going to use very little resources and no (?) CPU time, so I don't see the 1-1 nature being an issue. I have a thread pool handling socket communications via kqueue. Sometimes these communications need to be processed on NSRunLoops (some threads use a custom kqueue-based runloop, some use NSRunLoop), so I setup CFFileDescriptors to use the existing kqueue descriptors (CF kqueue wait then on my kqueue). By adding CFFileDescriptor, the new thread count is 2 x old thread-count (since each kqueue-based runloop can now be wrapped in NSRunLoop), and fd usage is 2 x kqueue- based runloop count right off the bat. This is after I add each CFFileDescriptor source to mutliple CFRunLoops (assigning a source to mulitple runloops seems to work, but I wonder if the CFFileDescriptor tracks the CFRunLoops on which it is scheduled). I needed to identify this issue because the leak eventually exhausted the limit on file descriptors- now that the leak is fixed, the app hovers around 50 fds. Before you go off creating your own version of CFFD, I'd suggest actually using CFFD in a realistic scenario and checking for these leaks. I've been using CFFD for awhile, and it's never posed any issue (granted I haven't been actively searching for these leaks). Are you opening so many files that these leaks would pose an issue? I agree that it's unsettling to see these leaks in such a simple scenario, but implementing your own version of CFFD using a centralized thread etc. is also not an easy task, and that code will just become obsolete once the CFFD leaks are addressed. And as far as your hack... well, I'd consider that a case of the cure being worse than the symptom. =) Again, are you opening so many files that it warrants such scandalous tactics? Anyway, I'm going to radar this, and I hope you'll do the same. Thanks for your replies, Dave. The evil hack is obviously just a stop- gap measure until I figure out a real plan. I still may need to write my own CFFD replacement to cut down on thread and fd usage. This email sent to site_archiver(a)lists.apple.com

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Re: 64-bit Mac OS X kernel
by Bill Northcott 21 Aug '09

21 Aug '09

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Cheers 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: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… This email sent to site_archiver(a)lists.apple.com On 21/08/2009, at 5:00 PM, Esteban Bodigami wrote: it is never silly to ask questions. knowing this information isn't "mainstream"; having a CS degree doesn't mean anything. ..... PS All this of course demonstrates the inherent silliness of people arguing about whether some system is 32 bit or 64 bit! Asking questions is good. Its the silly debates about the meaning of '64 bit system' which are a waste of time. One could run a full 64 bit app with a GUI on MacOS 10.4 Tiger if you were prepared to use X11 and build your own 64 bit X11 libraries. smime.p7s

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Re: 64-bit Mac OS X kernel
by Jonas Maebe 21 Aug '09

21 Aug '09

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com On 21 Aug 2009, at 08:06, Bill Northcott wrote: Jonas _______________________________________________ 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… Carbon is deprecated and was only ever intended to provide temporary (9 years) support in OS X for old OS 9 apps. The situation is somewhat more nuanced than that: http://lists.apple.com/archives/Carbon-dev/2009/Feb/msg00037.html (note the correction regarding the last two WWDC dates in the follow up) This email sent to site_archiver(a)lists.apple.com

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Re: 64-bit Mac OS X kernel
by Bill Northcott 21 Aug '09

21 Aug '09

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com There are plenty of 64-bit Cocoa apps on 10.5. 64-bit libSystem-only apps can run on Tiger, as far as memory serves. The PowerMac G5 is a 64-bit machine. It doesn't stop being a 64-bit machine if you decide to only run 32-bit apps. Similarly, a 64-bit _kernel_ is mostly irrelevant for the vast majority of people. All it means in practice is that your kexts will break. Bill Northcott _______________________________________________ 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 21/08/2009, at 2:48 AM, Mo McRoberts wrote: The PowerMac G5 shouldn't have being advertised as 64-bit if the kernel wasn't... hey, even Carbon or Cocoa isn't 64bit (I don't care which API). As I understand it, the kernel in Darwin/OS X is not tightly linked to userland code. Only kernel extensions (kexts) have to match the architecture of the kernel. So a 32 bit Intel kernel can support 64 bit Intel code and 32 bit ppc code via Rosetta. This has been true since 10.4 Tiger which could support 64 bit UNIX type tools as long as they only needed a limited range of libraries. 10.5 Leopard introduced 64 bit into all libraries including the GUI. (Cocoa on Leopard is 64 bit, Carbon is deprecated and was only ever intended to provide temporary (9 years) support in OS X for old OS 9 apps.) I have no NDA information on 10.6 but I think Apple has been quite clear that it will have a 64 bit kernel and therefore require 64 bit kernel extensions, All Apple's current hardware is 64bit. The 64 bit kernel was not introduced earlier to avoid Vista style driver issues. PS All this of course demonstrates the inherent silliness of people arguing about whether some system is 32 bit or 64 bit! smime.p7s

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Re: CFFileDescriptor fd leak?
by Dave Keck 21 Aug '09

21 Aug '09

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:mime-version:sender:received:in-reply-to :references:from:date:x-google-sender-auth:message-id:subject:to:cc :content-type; bh=qC4J//1hiYuVyo6OlorTWFPnDzzv36eQvcJiZTGeqLs=; b=R9ljQ44KxMyZSnhK9h5y8ZzgnEkQ7nxtnC5zFyahol8EPpip1qSOkHpQsaYIH0yP9s rh0jf11Qp2shqb/VqiVuc4nlBDe4L9se/ArjKeCpN7AfvS48X/CfMszi7FgoIiaX10Dn 0LwMyfpQv+rsFvryJVIZp6h8PwvT+1tG5Cbj4= Domainkey-signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:sender:in-reply-to:references:from:date :x-google-sender-auth:message-id:subject:to:cc:content-type; b=ktmpHSbhgniHPNcysJQroqX2hJPvJIjMGyT6L7ld7YiazaBGOEAdvo75tq+s9Kg9zf DtTbAnj6IgA2EptkqxZrWzlYbxGPEdZnWedcE64D5a6vpUzTvyLE95iApjxMei6I48y2 mt8djnyAL4FSPfgtx/Z6KfLHyZjcZrpDLe0HQ= _______________________________________________ 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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